(1) This is the generic class for processes and apparatus for making a measurement of any kind or for making a test of any kind, and takes all such subject matter not provided for in other classes.
(2) The term "test" includes inspection, processes and apparatus for determining qualities by inspection being included where not provided for in other classes.
(3) This class is the generic class for sampling and takes all sampling apparatus and processes not otherwise provided for; see subclasses 863+ and the notes thereto.
(1) Note. Processes and apparatus for its practice are classified together.
(2) Note. Substantially all apparatus classes have means to automatically control the operation of the apparatus. Such automatic controls usually involve some means to measure or test a condition or change of condition, the measuring or testing means then operating to control or regulate the apparatus in accordance with the results of the measurement or test. For such subject matter, the class appropriate to the type of apparatus controlled should be investigated. No attempt has been made to search note automatic controls.

LINES WITH OTHER CLASSES AND WITHIN THIS CLASS
Measuring and testing, per se, of the following types are found in Subclass References to the Current Class and References to Other Classes, below:
ACOUSTICAL;
BIOLOGICAL;
CHEMICAL;
ELECTRICAL;
GEOMETRICAL INSTRUMENTS;
INSPECTING;
OPTICAL (See Radiant Energy);
RADIANT ENERGY (See Optical)
SPEED MEASURING;
SURGICAL;
TIME MEASURING;
WEIGHING SCALES;
MASS SPECTROMETRY
(1) Note. For elements, not combined with means to indicate the result of a measurement or test, and not combined with means to automatically control art devices, that respond to a condition or change of condition. Also see the reference to the Radiant Energy class.
ART APPARATUS OR PROCESS COMBINED WITH MEASURING OR TESTING
(1) Note. Art apparatus or process significantly claimed, in combination with measuring or testing is classified in general in the class providing for the art apparatus or process. The line stated for particular classes should be consulted.

SEE OR SEARCH THIS CLASS, SUBCLASS:
32 for devices responsive to specific gravity of liquids. (See Lines With Other Classes and Within This Class, (1) Note, above)
54 for devices responsive to viscosity of liquids. (See Lines With Other Classes and Within This Class, Mass Spectrometry, (1) Note, above)
174 for feelers for gauges.(See Lines With Other Classes and Within This Class, Mass Spectrometry, (1) Note, above)
227 for straight line light ray type and 300+ for indicator of direction of force traversing natural media.(See Lines With Other Classes and Within This Class, Mass Spectrometry, (1) Note, above)
279 for pressure responsive diaphragms for volume or rate of flow meters, per se. (See Lines With Other Classes and Within This Class, Mass Spectrometry, (1) Note, above)
322.5 for floats, per se. (See Lines With Other Classes and Within This Class, (1) Note, above)
335 for humidity responsive elements. (See Lines With Other Classes and Within This Class, Mass Spectrometry, (1) Note, above)
501 for feelers for gauges. (See Lines With Other Classes, Mass Spectrometry, (1) Note, above)
514.01 for acceleration responsive elements. (See Lines With Other Classes and Within This Class, Mass Spectrometry, (1) Note, above)
527 through 551, for speed responsive elements. (See Lines With Other Classes and Within This Class, Mass Spectrometry, (1) Note, above)
649 for devices responsive to and for measuring vibrations of a body.(See Lines With Other Classes and Within This Class, Mass Spectrometry, (1) Note, above)
741 for Bourbon tubes, per se, for fluid pressure gauges.(See Lines With Other Classes, Mass Spectrometry, (1) Note, above)
861.42 for devices responsive to differential pressures. (See Lines With Other Classes and Within This Class, Mass Spectrometry, (1) Note, above)

REFERENCES TO OTHER CLASSES

SEE OR SEARCH CLASS:
23, Chemistry: Physical Processes, (Apparatus Or Process Combined With Measuring Or Testing)
26, Textiles: Cloth Finishing, subclass 70 for inspection and examination of cloth. (Inspecting)
26, Textiles: Cloth Finishing, (Apparatus Or Process Combined With Measuring Or Testing)
28, Textiles: Manufacturing, 226 especially subclass 227 for apparatus and processes of detecting knots, bunches, or slubs in threads.
33, Geometrical Instruments, for measuring and testing involving only the determination of the characteristics and mutual relation of points, lines, angles, surfaces and solids and for mechanically guided means for describing lines. Class 73 has combinations of geometrical instruments with other measuring or testing means. (Geometrical Instruments)
33, Geometrical Instruments, subclass 501, for feelers for gauges 227+, for straight line light ray type and 300+, for indicator of direction of force traversing natural media. (See Lines With Other Classes, Mass Spectrometry, (1) Note, above)
34, Drying and Gas or Vapor Contact With Solids, subclass 88 for combinations having inspecting means as a part thereof. (Inspecting)
34, Drying and Gas or Vapor Contact With Solids, subclass 88, 89 for such apparatus combined with inspecting, indicating or testing means. (Apparatus Or Process Combined With Measuring Or Testing)
47, Plant Husbandry, subclass 14 for apparatus and processes for ascertaining the life in seeds.(Apparatus Or Process Combined With Measuring Or Testing)
74, Machine Element or Mechanism (Apparatus Or Process Combined With Measuring Or Testing)
84, Music, (Apparatus Or Process Combined With Measuring Or Testing)
99, Foods and Beverages: Apparatus, subclass 285, 342+, for infusors and cooking devices combined with measuring and testing means.(Apparatus Or Process Combined With Measuring Or Testing)
60, Power Plants, subclasses 527-531 for heat actuated mechanisms producing force or motion and having no specified motion utilizing structure (See Lines With Other Classes, Mass Spectrometry, (1) Note, above)
65, Glass Manufacturing, 29.1 and 29.12+ for glassworking or treating processes including programming, timing, cycle control, inspecting, measuring, or testing; subclasses 158+ and 160+ for glassworking and treating apparatus with inspection, programming, timing, cycle control, inspecting, measuring, or testing means. (Inspecting)
74, Machine Element or Mechanism, 5 for gyroscopes.(See Lines With Other Classes, Mass Spectrometry, (1) Note, above)
84, Music, subclass 409 for tuning forks.(See Lines With Other Classes, Mass Spectrometry, (1) Note, above)
92, Expansible Chamber Devices, appropriate subclasses. For
the line between Class 73 and Class 92, see References to Other Classes of the class definition of Class 92, under SEARCH CLASS 73. (See Lines With Other Classes, Mass Spectrometry, (1) Note, above)
95, Gas Separation: Processes, for processes of gas separation, per se. Class 73 will take the combination of gas separation and significant gas analysis. The combination of gas separation and a nominal step of "analyzing" or "detecting" without further detail of the analysis or detection is insufficient to cause a patent to be placed in Class 73; that patent will be placed in Class 95. Also, if there is feedback from the analytical apparatus to control or effect a change in the gas separating operation, then classification is in Class 95. (Chemical)
96, Gas Separation: Apparatus, for apparatus for gas separation, per se. Class 73 will take the combination of gas separation apparatus and significant gas analysis means. The combination of gas separation apparatus and nominal means for "analyzing" or "detecting" without further detail of the analysis or detection means is insufficient to cause a patent to be placed in Class 73; that patent will be placed in Class 96. Also, if there is feedback means from the analytical apparatus to control or effect a change in the gas separation, then classification is in Class 96. For volume or rate of flow meters combined with gas and liquid separators, see subclass 200 in Class 73. (Chemical)
101, Printing, 35, for selective printing machines in which the control of the printing element selected is by a gauge measuring the article printed upon and the article is other than a rectangular sheet.(Apparatus Or Process Combined With Measuring Or Testing)
116, Signals and Indicators, for devices for giving a signal or indication other than electrical of the presence or absence of a condition, and in 200 for nonelectrical indicating means, such as dial and pointer structure, not claimed in combination with any particular measuring or testing means provided for in Class 73. Class 73 takes the combination of measuring or testing means significantly claimed combined with a signal or indicator, and devices that respond to a condition and give a series of indications which follow or vary with the variations of the condition wherein more than a mere named operator for the signal or indicator is included.(Apparatus Or Process Combined With Measuring Or Testing)
118, Coating Apparatus, 712 for coating apparatus having measuring or testing features. (Inspecting)
128, Surgery, (Apparatus Or Process Combined With Measuring Or Testing)
128, Surgery, 630 for methods and apparatus for diagnosing diseased or abnormal condition of the body. (Surgical)
136, Batteries: Thermoelectric and Photoelectric, (see also Note 4), subclass 182 for batteries combined with testing or indicating means.(Apparatus Or Process Combined With Measuring Or Testing)
136, Batteries: Thermoelectric and Photoelectric, subclass 89 for electro-optical batteries and subclass 200, for thermal sensitive batteries.(See Lines With Other Classes, Mass Spectrometry, (1) Note, above)
137, Fluid Handling, 227, 524 and 551+ for fluid handling means combined with an indicator register, recorder, alarm or inspection means. (See also (4) Note).(Apparatus Or Process Combined With Measuring Or Testing)
138, Pipes and Tubular Conduits, subclass 90 for pipe plugs having either provision for introducing a fluid into the pipe or for the attachment of a gauge.(Apparatus Or Process Combined With Measuring Or Testing)
148, Metal Treatment, 128 for process of heat treating metal in the solid state; and involving also a measuring, testing or sensing operation. The operation generally, is directed to control of the heat treatment. (Chemical)
156, Adhesive Bonding and Miscellaneous Chemical Manufacture, subclass 64 and 378 for laminating processes and apparatus having measuring or testing features.(Apparatus Or Process Combined With Measuring Or Testing)
162, Paper Making and Fiber Liberation, subclass 49, 198 and 263 for measuring and testing in combination with fiber liberation or paper making.(Apparatus Or Process Combined With Measuring Or Testing)
166, Wells, 250 for well processes including measuring and testing means, subclass 264 for processes of merely sampling a well fluid and appropriate subclasses for corresponding apparatus and subclasses 64, 66 and 113 for well apparatus including measuring or testing means.(Apparatus Or Process Combined With Measuring Or Testing)
177, Weighing Scales, appropriate subclasses for a weigher, per se; for a weigher with features for making a test not specifically provided for in Class 73; and for a weigher in combination with another measuring device not provided for in Class 73. (Apparatus Or Process Combined With Measuring Or Testing)
177, Weighing Scales, appropriate subclasses for a weigher, per se; especially 50 for a weigher with features for making a test not specifically provided for in Class 73; and subclass 245 for a weigher in combination with another measuring device not provided for in Class 73.
181, Acoustics, subclass .5 for miscellaneous mechanical
detectors for sound waves.(See Lines With Other Classes, Mass Spectrometry, (1) Note, above)
181, Acoustics, 101, 123+ and 125 for devices analogous to "sonic" or acoustical testing apparatus of this (73) class.(Acoustical)
194, Check-Actuated Control Mechanisms, for check controlled measuring and testing devices, and 302 for fraud preventing coin-testing devices. (Apparatus Or Process Combined With Measuring Or Testing)
198, Conveyors: Power-Driven, subclass 502 for a conveyor combined with load measuring means, and subclasses 504+ for a conveyor combined with a load weighing means. (Apparatus Or Process Combined With Measuring Or Testing)
200, Electricity: Circuit Makers and Breakers, for the combination of a measuring instrument and a circuit controller when specific structure of the circuit controller is claimed. Class 73 takes the combination of a class 73 measuring instrument and a circuit controller when the circuit controller is claimed broadly. In connection with Class 200, the definitions of the subclasses of Class 73 which provide for measuring instruments combined with other structure are modified by this note. (Apparatus Or Process Combined With Measuring Or Testing)
203, Distillation: Processes, Separatory, 1 for a process of separatory distillation including a positive step of determining a specific characteristic for control purposes. (Chemical)
204, Chemistry: Electrical and Wave Energy, 400 for apparatus for performing electrolytic analysis and testing. (Chemical)
205, Electrolysis: Processes, Compositions Used Therein, and Methods of Preparing the Compositions, 775 for electrolytic analysis and testing processes. (Chemical)
209, Classifying, Separating, and Assorting Solids, (see also the Class 209 reference for Inspecting), for testing and assorting of solids in accordance with physical characteristics, as by sifting materials to determine the proportion of each size in the whole; attention is called particularly to assorting in 509 which includes means for testing or measuring objects and sorting them in accordance with their characteristics. (Apparatus Or Process Combined With Measuring Or Testing)
209, Classifying, Separating, and Assorting Solids, subclass 702 for manual assorting involving inspecting means. (Inspecting)
221, Article Dispensing, subclass 155 for article dispensers not otherwise provided for, having transparent inspecting or
viewing means so that the articles can be dispensed and may be inspected. (Inspecting)
222, Dispensing, 154, for inspecting devices combined with fluent material dispensers so that the material to be dispensed may be inspected. (Inspecting)
222, Dispensing, (see also Class 222 reference for Inspecting), for dispensers which involve volume measuring, and see section 6 of the main class definition of Class 222, for the line with volume or rate of flow meters. The notes to Class 222 set forth the search field for apparatus for dispensing measured quantities of material.
234, Selective Cutting (e.g., Punching), 33 for a selective cutting device provided with stopping means responsive to detection of improper treatment of work (e.g., failure to punch in every column, or to follow a 2 - 5 code). (Apparatus Or Process Combined With Measuring Or Testing)
235, Registers, subclass 61 for mechanical calculators and subclass 92 for electrical counting techniques which may include testing or measuring. (Apparatus Or Process Combined With Measuring Or Testing)
241, Solid Material Comminution or Disintegration, for solid comminution combined with measuring or testing of material. See section 12 of the main class definition of that class for a statement of the line. (Apparatus Or Process Combined With Measuring Or Testing)
248, Supports, subclass 27 for means for supporting an instrument in a panel. (Apparatus Or Process Combined With Measuring Or Testing)
250, Radiant Energy, for measuring and testing by radiant energy and measuring radiant energy. See particularly subclass 250 for wavemeters for radiated electro-magnetic waves, 253+ for methods and apparatus to irradiate earth material above or below the ground and testing the radiation modified or emitted as a result or irradiation by the material or testing the radiation emitted by the material, 281+ for methods and apparatus for the ionic separation or analysis of materials, 306+ for methods and apparatus for the inspection of solids or liquids by charged particles, 336.1+ for methods and apparatus including invisible radiant energy responsive electric signalling having detectors sensitive to infrared, ultraviolet, X-ray, radio-active rays and neutron radiation or to a radiation source modified by a tested material: and 472.1+ for methods of detecting invisible radiation by a nonelectrical detector or invisible radiation nonelectrical detectors, per se. (Radiant Energy--also see Optical references)
250, Radiant Energy, 336 for speed responsive devices using an invisible radiation source and an electric signalling device and, subclasses 459+ for speed responsive stroboscopes
using invisible radiation and a luminous screen.
250, Radiant Energy, subclass 71 for fluorescent detectors of ray energy, subclasses 83+ for miscellaneous detectors of ray energy.(See Lines With Other Classes, Mass Spectrometry, (1) Note, above)
250, Radiant energy, 281 for methods and apparatus for the ionic separation or analysis of ionic material by the mass to charge ratio of the ionic material (e.g., mass spectrometry). (Electrical)
252, Compositions, subclass 408 for chemical indicating compositions.(See Lines With Other Classes, Mass Spectrometry, (1) Note, above)
252, Compositions, subclass 299.01 for liquid crystal compositions and subclass 408.1 for analytical, testing or indicating compositions involved in a physical test procedure. (Chemical)
290, Prime-Mover Dynamo Plants, for electric generating means driven by a prime mover (a motor other than an electric motor) having prime-mover controls (e.g., throttle, fuel valve, etc.) which are characteristic of controls used on prime movers. The line between Class 290 and Class 73 is as follows: Where the claimed subject matter is clearly limited to testing the prime mover, or where the generating means is designated specifically as a "dynamometer", or a generator having an absorption circuit (such as, for example, an induction disk, or a resistor across the armature circuit of the generator), original classification is in Class 73. Where the generating means is claimed merely as a "generator" or a "dynamo-electric machine" and the claim is not otherwise limited to testing, original classification is in Class 290, regardless of the specific disclosure. (Electrical)
292, Closure Fasteners, 307 for miscellaneous seals and sealing devices, which may be employed in connection with measuring and testing devices. (Apparatus Or Process Combined With Measuring Or Testing)
310, Electrical Generator or Motor Structure, appropriate subclasses, for the structure of electrical generators. The line between testing means which generate electricity in Class 73 and generating means in Class 310 is as follows: Where the claimed subject matter is limited to structural details only of a dynamoelectric machine or a generator of a dynamometer, original classification is in Class 310 regardless of the title or function assigned to the structure (for example, a "dynamometer" having detailed structure set forth which pertains only to the structure of the generating mechanism, per se, is classifiable in class (310).
310, Electrical Generator or Motor Structure, subclass 306 for pyromagnetic devices and subclass 311 for piezoelectric devices. (See Lines With Other Classes, Mass Spectrometry,
(1) Note, above)
315, Electric Lamp and Discharge Devices: Systems, see Note 3C.
315, Electric Lamp and Discharge Devices: Systems, 364, for processes and apparatus for testing such devices. (Electrical)
320, Electricity: Battery and Condenser Charging and Discharging, subclass 48. (Electrical)
322, Electricity: Single Generator Systems, appropriate subclasses, for systems of control of electric generators of general application. The line between testing means which generate electricity in Class 73 and generating systems in Class 322 is as follows: Where the claimed subject matter is limited (either positively or by necessary inference) to a system which includes a "dynamometer" or to a dynamoelectric machine having an absorption circuit (such as for example a dynamoelectric machine or generator having an eddy current disk or an induction disk or having a resistor connected across the output circuit thereof), original classification is in Class 73. Where the claimed subject matter is limited merely to an electric "generator" or to a "dynamoelectric machine" in combination with control means therefor, original classification is in Class 322, regardless of the disclosure, except as noted herein above in the reference to Class 290. (Electrical)
324, Electricity: Measuring and Testing, for testing to determine electrical properties by electrical means even though nonelectrical values are derived from the electrical values determined. Note particularly 323 for ore detection by determination of electrical properties, subclass 71.5 for the determination of nonelectric properties by measuring electric properties, and subclasses 76.11+ for the measurement of electricity, per se. (Electrical)
324, Electricity: Measuring and Testing, 68 for electrical speed measurement. (Speed Measuring)
338, Electrical Resistors, 2 for strain gauge type resistors and subclasses 13+ for resistors whose value changes in response to a condition or conditions. Also see the Electrical reference to Class 338. (See Lines With Other Classes, Mass Spectrometry, (1) Note, above)
338, Electrical Resistors, 2 includes resistors of the strain gauge type together with the device which is subject to deformation when not otherwise classifiable or with structure securing the resistor to such a device. When the meter, Wheatstone bridge connection, or other current measuring device is claimed with the resistor in the above combination, classification is in Class 73, especially subclasses 763+ and 133+. Class 338, subclasses 13+, includes resistors, per se, responsive in resistance value to a change
in condition, or resistors combined with a condition sensing actuator which modifies the resistance value of the resistor, such as indented subclasses 25+ for resistors responsive to ambient temperature, subclass 33 for resistors with a float actuator, subclasses 34+ for resistors with gas, vapor, or moisture absorbing or collecting, subclasses 36+ for resistors which are fluid or gas pressure actuated, and subclass 47 for force actuated resistors. The inclusion of a meter, Wheatstone bridge or other current measuring device in series with the resistor in this combination would be sufficient for classification in Class 73, especially subclass 29 for moisture content or vapor pressure analysis, subclasses 453 and 308 for float actuated resistors with indicators, subclasses 133+ for dynamometers, and subclasses 398+ for fluid pressure gauges of the current modifying type. (Electrical)
338, Electrical Resistors, see Mass Spectrometry, (1) Note, above.
340, Communications: Electrical, 670 for electrical speed alarms. (Speed Measuring)
340, Communications: Electrical, 870.01 takes telemetric signaling means useful in transmitting a measured quantity, not limited to any particular measuring instrument provided for in other classes, while Class 73 takes such telemetric signaling means in combination with a particular measuring means of the type provided for in Class 73. (Electrical)
Class 340 also, in subclasses 500+ takes electrical devices permanently associated with the object or environment being monitored for giving a signal or indication of the presence or absence of a condition but wherein no quantitative measurements may be made. Devices for making a quantitative measurement of the type provided for in Class 73 in which the instrument responds to a condition and a series of indications are given which follow or vary with the variations of the condition are in Class 73, even though employing electrical signaling means, such as lamps, to indicate visually the result. The general line is that Class 73 takes particular measuring or testing means, even though claimed in combination with electric signaling means, while Class 340 takes the signaling subcombination. (Electrical)
340, Communications: Electrical, see Mass Spectrometry, (1) Note, above.
342, Communications: Directive Radio Wave Systems and Devices (e.g., Radar, Radio Navigation), see Mass Spectrometry, (1) Note, above.
342, Communications: Directive, Radio Wave Systems and Devices (e.g., Radar, Radio Navigation), appropriate subclasses, for those utilizing transmitted radio wave energy; see subclasses 1-205 for those utilizing reflected or otherwise returned radio wave (radar) energy. (Speed
Measuring)
342, Communications: Directive Radio Wave Systems and Devices (e.g., Radar, Radio Navigation), subclasses 1-205 for miscellaneous apparatus and method which involve the use of a reflected and/or otherwise returned radio wave (radar) system for detecting an object, or to measure the distance, direction and/or velocity of an object, and subclasses 350+ for directional radio. (Radiant Energy--also see Optical references)
343, Communications: Radio Wave Antennas, 700 for antennas. (See Lines With Other Classes, Mass Spectrometry, (1) Note, above)
346, Recorders, appropriate subclass. (Speed Measuring)
346, Recorders, appropriate subclass. (Time Measuring)
346, Recorders. (Apparatus Or Process Combined With Measuring Or Testing)
346, Recorders, appropriate subclass. (Electrical)
351, Optics: Eye Examining, Vision Testing and Correcting, 200 for optical eye examining and vision testing instruments such as optometers. (Optical, also see Radiant Energy References)
356, Optics: Measuring and Testing, for processes and apparatus which utilize visible light to measure the optical properties of substances, test visible light for optical properties and which use visible light to test for nonoptical properties not classified elsewhere particularly 23 for optical stroboscopes, subclasses 32+ for material strain analysis, subclasses 43+ for optical pyrometers, subclasses 124+ for lens or reflective image former testing, subclasses 213+ for photometers and subclasses 237+ for visual flaw inspection apparatus. (Optical, also see Radiant Energy References)
362, Illumination, subclass 2, 138 and 139 for inspection lamps. (Inspecting)
362, Illumination, (see also Class 362 reference for Inspecting), 23 for measuring instrument dials combined with illuminating means. (Apparatus Or Process Combined With Measuring Or Testing)
364, Electrical Computers and Data Processing Systems, subclass 550 wherein a data processing system or calculating computer is utilized to effect a measuring, testing, or monitoring operation on an external device or quantity, wherein the external device or quantity is only nominally claimed. When significant structure to the measuring or testing device is claimed, classification is in Class 73. (Apparatus Or Process Combined With Measuring Or Testing)
367, Communications, Electrical: Acoustic Wave Systems and Devices, 141 for underwater vibration detectors and subclasses 178+ for geophysical vibration transducers. (See Lines With Other Classes, Mass Spectrometry, (1) Note, above)
368, Horology: Time Measuring Systems or Devices, appropriate subclasses and the classes specified under "SEARCH CLASS" in the class and subclass definitions. (Time Measuring)
369, Dynamic Information Storage or Retrieval, 53 for an indication or test of an information storage or retrieval device or element thereof. (See Lines With Other Classes, Mass Spectrometry, (1) Note, above)
369, Dynamic Information Storage or Retrieval, see Note 4.
374, Thermal Measuring and Testing, for testing to determine a thermal condition or property of a specimen. (Electrical)
374, Thermal Measuring and Testing, 6 for determination of distance or position by measuring a thermal quantity related thereto. (Geometrical Instruments)
374, Thermal Measuring and Testing, for the combination of a thermal test and a thermal test and a nonthermal test. (Apparatus Or Process Combined With Measuring Or Testing)
376, Induced Nuclear Reactions: Processes, Systems, and Elements, 153 for detection of radiation by an induced nuclear reaction; subclasses 207+ for means to control a nuclear reaction; subclasses 207+ for means to control a nuclear reactor which means may include measuring and testing means; and subclasses 245+ for measuring or testing means; and subclasses 245+ for measuring or testing a fission reactor condition. (Chemical)
422, Chemical Apparatus and Process Disinfecting, Deodorizing, Preserving, or Sterilizing, appropriate subclasses, especially 50, 105+ and 129+ for analyzing apparatus involving means for causing, promoting, regulating, or controlling a chemical reaction. (Chemical)
422, Chemical Apparatus and Process Disinfecting, Deodorizing, Preserving, or Sterilizing, 55 for structured visual or optical indicator, per se, such as a litmus paper or other chemical test papers. (See Lines With Other Classes, Mass Spectrometry, (1) Note, above)
424, Drug, Bio-Affecting and Body Treating Compositions, 1.11 for Class 424 compositions containing a radionuclide and subclasses 9.1+ for compositions and methods for diagnosing or testing for a body condition or determining the potency of a medicine in a living being. (Biological)
424, Drug, Bio-Affecting and Body Treating Compositions,
appropriate subclasses for class defined in vivo test compositions and methods, particularly 1.11 wherein a radionuclide or intended radionuclide is recited. (Radiant Energy--also see Optical references)
428, Stock Material or Miscellaneous Articles, subclass 616 for a bimetallic element, per se. (See Lines With Other Classes, Mass Spectrometry, (1) Note, above)
435, Chemistry: Molecular Biology and Microbiology, 4 for processes in which there is a direct or indirect qualitative or quantitative measurement or test of a material which contains an enzyme or microorganism as well as processes in which a material containing an enzyme or microorganism is used to perform a qualitative or quantitative measurement or test, and compositions therefor and the processes of making such compositions; and subclasses 287.1+ for an apparatus for performing the above processes. (Chemical)
435, Chemistry: Molecular Biology and Microbiology, subclass 35 for a test method which involves both an enzyme or microbial reaction and the use of a radioactive material and subclass 288.7 for an optical enzyme or microbial reaction measuring and testing device in combination. (Radiant Energy--also see Optical references)
436, Chemistry: Analytical And Immunological Testing, 57 for a test method (which involves both a chemical reaction (e.g., ion exchange) and a measurement of radioactivity or isotope distribution. (Radiant Energy--also see Optical references)
455, Telecommunications, subclass 2, 67.1+, 115 and 226 for measuring and testing of modulated carrier wave communications. (Radiant Energy--also see Optical references)
494, Imperforate Bowl: Centrifugal Separators, subclass 10, for apparatus of that class provided with means for measuring or testing. (Apparatus or Process Combined With Measuring or Testing)
702, Data Processing: Measuring, Calibrating, or Testing, 1 for measurement system in a specific environment, subclasses 85+ for calibrating or correction system, subclasses 108+ for testing system, and subclasses 127+ for generic measurement system. Class 73 takes the combination of register claimed broadly or specifically in combination with significant measuring or testing of the type provided for in Class 73. (Electrical)
935, Genetic Engineering: Recombinant DNA Technology, Hybrid or Fused Cell Technology, and Related Manipulations of Nucleic Acids, which provides a search collection for processes of altering the genetic structure of micro-organisms; genes and methods of modifying genes and their expression; vectors and methods of modifying vectors; methods of introducing DNA into a cell; microorganisms, per
se, which have had their genetic sequence altered by recombinant DNA techniques or by cell fusion or by uptake of DNA; testing; separation techniques; apparatus; and methods of use of vectors or of the genetically engineered micro-organisms; methods of gene therapy or genetic modification of living organisms. (Chemical; and Radiant Energy {and see Optical references})

INSTRUMENT PROVING OR CALIBRATING:
This subclass is indented under the class definition. Subject matter comprising a process or an apparatus for (a) ascertaining (i.e., proving) the quality of a measuring device, a testing device, or a condition responsive device by testing the respective device, or (b) checking, adjusting, or standardizing systematically (i.e., calibrating) the graduations of a quantitative measuring instrument or a condition responsive device (e.g., sensors, safety valves, etc.).
(1) Note. Where the proving or calibrating is by measuring means or testing means of a kind provided for in another measuring or testing class, the subject matter is found in the other measuring or testing class. See such measuring or testing class and the Lines With Other Classes to this class definition.
(2) Note. Where more structure of a measuring device, a testing device, or a condition responsive device is recited than that which is necessary to (a) prove or calibrate or (b) identify the measuring device, the testing device, or the condition responsive device, the subject matter goes with the analyzer or the condition responsive device.

SEE OR SEARCH CLASS:
137, Fluid Handling, 455 for a line condition change responsive valve.
200, Electricity: Circuit Makers and Breakers, appropriate subclasses for mechanical switches with adjustment means.
250, Radiant Energy, appropriate subclasses for measuring invisible light combined with calibration, particularly subclass 252.1 for (a) a method for establishing a reference indication of invisible radiation or (b) a method of error determination or correction using a reference indication of invisible radiation level; and subclass 363.09 for a method of invisible radiant energy responsive electrical signalling with a radiant energy source and with calibration.
257, Active Solid-State Devices (e.g., Transistors, Solid-State Diodes), subclass 48 for test or calibration structure for an active solid-state device.
324, Electricity: Measuring and Testing, subclass 74 for testing or calibrating electric meters by purely electrical means; subclass 130 for systems for measuring, testing, or sensing electricity, per se, with self calibration; subclass 202 for calibration of magnetic measuring or testing systems; and subclass 601 for calibration of impedance, admittance, or other electrically stimulated response measuring or testing systems.
340, Communications: Electrical, subclass 501 for an apparatus for providing a humanly perceptible signal in response to a predetermined condition (e.g., alarms) combined with calibration or compensation means and subclass 870.04 for a telemetry system combined with calibration means.
342, Communications: Directive Radio Wave Systems and Devices (e.g., Radar, Radio Navigation), 165 for testing or calibrating of a radar system.
356, Optics: Measuring and Testing, appropriate subclasses for an apparatus for measuring or testing by measuring visible light combined with proving or testing means, especially subclass 6 for testing or indicating the condition of a range finder with regards to its adjustment, alignment, or calibration by measuring visible light; subclass 46 for an electric light utilizing a lamp as a standard for photometry or optical pyrometry measuring; subclass 124 for lens or reflective image former testing in general; and subclass 243 for an apparatus for measuring or testing visible light including structure for a basis for comparison with a specimen or a portion thereof under test.
364, Electrical Computers and Data Processing Systems, 571.01 for the use of an electronic calculator to adjust a measurement device.
374, Thermal Measuring and Testing, 1 for calibration or testing of a thermally responsive device.
377, Electrical Pulse Counters, Pulse Dividers, or Shift Registers: Circuits and Systems, subclass 29 for calibrating or testing an electrical counter.
378, X-Ray or Gamma Ray Systems or Devices, subclass 207 for a testing or calibration accessory of an X-ray or gamma ray system.
435, Chemistry: Molecular Biology and Microbiology, subclass 967 for a cross-reference art collection of standards, controls, materials (e.g., validation studies, buffer systems, etc.).

Gas or liquid analyzer:
This subclass is indented under subclass 1.01. Subject matter wherein either (a) the apparatus for proving or calibrating or (b) the device which is being proven or calibrated either (1) detects or measures the composition of, or some constituent or an identifying characteristic of a gas or gaseous mixture or (2) detects or determines the composition of, a constituent of, or a property of a liquid or a liquid suspension of a solid.

SEE OR SEARCH THIS CLASS, SUBCLASS:
23.2 for a gas analyzer or sensor, per se, in particular subclasses 23.21+ for a gas analyzer including means for making a correction for an undesirable variation in a condition within an apparatus or in a test result due to such condition.
53.01 for liquid testing (e.g., liquid chromatography), per se.
73 for detecting the moisture content of a material.

SEE OR SEARCH CLASS:
204, Chemistry: Electrical and Wave Energy, subclass 401 for fault testing of a sensor or a component of an electrolytic analysis and testing apparatus and subclass 408 for such an analysis or testing apparatus with means for temperature or pressure compensation.
250, Radiant Energy, 253 for the detection of a gas either within or emanating from the earth by invisible radiation emanating from the gas naturally or as a result of irradiation by invisible radiation; and subclasses 336.1+ for testing of a gas by utilizing an electric signalling device detecting radiation induced or emitted naturally or detecting infrared, ultraviolet, X-ray, or gamma radiation or neutrons modified by the gas.
324, Electricity: Measuring and Testing, appropriate subclasses for testing an electrical property of a gas, in particular 464 for analyzing gas using ionization effects.
338, Electrical Resistors, 34 for a resistor, per se, which is responsive to the condition of a gas wherein no quantitative measurements of the gas are disclosed.
340, Communications: Electrical, 632 for an electrical indicator providing a humanly perceptible signal representing a predetermined condition of a gas.
356, Optics: Measuring and Testing, 402 for gas analysis
utilizing a colorimeter to determine the shade or color of the gas.
422, Chemical Apparatus and Process Disinfecting, Deodorizing, Preserving, or Sterilizing, 50 for an apparatus utilizing a chemical reaction to analyze gas.
436, Chemistry: Analytical and Immunological Testing, subclass 68 for a process which utilizes a chemical reaction to analyze gas.

Reference standard:
This subclass is indented under subclass 1.02. Subject matter including a means for providing a reference criterion and wherein the apparatus for proving or calibrating uses the reference criterion for comparison purposes for proving or calibrating the device.

SEE OR SEARCH CLASS:
204, Chemistry: Electrical and Wave Energy, 427 for an electrolytic gas sample sensor, per se, combined with a gas reference material; and subclass 435 for a standard reference electrode in an electrolytic analysis or testing apparatus.
356, Optics: Measuring and Testing, subclass 243 for an apparatus for measuring or testing visible light including structure forming a basis for comparison with a specimen or a portion thereof under test.
436, Chemistry: Analytical and Immunological Testing, particularly 8 for a composition for standardization, calibration, simulation, or processes of use in preparation for chemical testing.

Permeable outlet or flawed element:
This subclass is indented under subclass 1.03. Subject matter wherein the reference standard comprises (a) a barrier having interstices, pores, or micropores through which the liquid or gas diffuses or (b) a solid body having a known imperfection which is detected by the gas or liquid.

Piston, sprayer, nozzle, or orifice:
This subclass is indented under subclass 1.03. Subject matter wherein the reference standard comprises either (a) a solid cylinder or disk that fits snugly into a large cylinder and moves back and forth under fluid pressure (i.e., a piston), (b) a means for discharging a fine jet of liquid from a pressurized container (i.e., a sprayer), (c) a tube having a taper or constriction (i.e., a nozzle), or (d) an opening (i.e., an orifice).

SEE OR SEARCH THIS CLASS, SUBCLASS:
1.16 for either (a) proving or calibrating a flowmeter having a nozzle or (b) using a flowmeter having a nozzle to prove or calibrate a device.
216 for a Weir type flowmeter having a constriction in the form of a submerged orifice or discharge nozzle.
294 for a liquid level or depth gauge having a funnel or hose nozzle.
861.61 for a flowmeter having a pressure differential type (a) orifice or (b) flow nozzle.

SEE OR SEARCH CLASS:
239, Fluid Sprinkling, Spraying, and Diffusing, appropriate subclasses for a sprayer or a nozzle, per se.

Gas:
This subclass is indented under subclass 1.02. Subject matter wherein either (a) the apparatus for proving or calibrating the device or (b) the device which is being proven or calibrated is an apparatus for detecting or measuring the composition of or some constituent of a gas or gaseous mixture.

SEE OR SEARCH THIS CLASS, SUBCLASS:
23.2 for a gas analyzer or sensor, per se, in particular subclasses 23.21+ for a gas analyzer including means for making a correction for an undesirable variation in a condition within an apparatus or in a test result due to such condition.

SEE OR SEARCH CLASS:
204, Chemistry: Electrical and Wave Energy, 400 for an electrochemical gas sensor, per se.
324, Electricity: Measuring and Testing, particularly 464
for analyzing gas using ionization effects and appropriate subclasses for testing gas by measuring impedance, admittance, and related quantities.
422, Chemical Apparatus and Process Disinfecting, Deodorizing, Preserving, or Sterilizing, 50 for an apparatus utilizing a chemical reaction to analyze a gas, particularly subclass 89 for gas chromatography.
436, Chemistry: Analytical and Immunological Testing, particularly subclass 68 for a process utilizing a chemical reaction for determining the gases in the blood and subclasses 161+ for chromatography.

Span or zero:
This subclass is indented under subclass 1.06. Subject matter wherein the measuring, testing, or condition responsive device produces an output signal in response to a condition being sensed and wherein the device is proven or calibrated by setting a range of values or a base value for the output signal.

Dynamometer:
This subclass is indented under subclass 1.01. Subject matter wherein either (a) the apparatus for proving or calibrating or (b) the device being proven or calibrated measures or determines force, torque, work, or mechanical power.
(1) Note. For purposes of this subclass, a dynamometer may either be employed to measure an applied load or to apply a measured load (e.g., for test purposes).

SEE OR SEARCH THIS CLASS, SUBCLASS:
54.39 for a viscometer measuring shearing torque between parallel surfaces wherein more structure of the force measuring device is recited than is necessary to describe the calibrating apparatus.
862 for a dynamometer, per se.

SEE OR SEARCH CLASS:
177, Weighing Scales, appropriate subclasses, in particular subclass 50 for a weighing scale combined with testing wherein more structure of the force measuring device is
recited than is necessary to describe the calibrating apparatus.
310, Electrical Generator or Motor Structure, subclass 338 for a force responsive piezoelectric sensor combined with mechanical energy coupling means.
318, Electricity: Motive Power Systems, appropriate subclasses for a dynamometer controlling a motor, in particular subclass 646 for a positional servo system with force or weight measuring.
324, Electricity: Measuring and Testing, subclass 727 for piezoelectric crystal testing.
338, Electrical Resistors, subclasses 2-6 for strain gauges, per se, in particular subclass 5 for a dynamometer type strain gauge, and subclass 47 for a force actuated electrical resistor.
340, Communications: Electrical, 665 for an electrical indicating system providing a humanly perceptible signal in response to a predetermined force or stress.
FORCE:
The strength or energy exerted upon or brought to bear or the cause of motion or change in motion or a state of rest.
POWER:
The rate at which work is done or the rate at which energy is transferred.
TORQUE:
A turning or twisting force or a force that produces or tends to produce rotation or torsion.
WORK:
The transference of energy that is produced by motion at the point of application of force which is measured by multiplying the force and the displacement of its point of application in the line of action.

Torque:
This subclass is indented under subclass 1.08. Subject matter wherein either (a) the apparatus for proving or calibrating or (b) the device being proven or calibrated is responsive to a force couple or moment of force that induces or resists rotation of a body about a point or an axis (i.e.,
torque).

SEE OR SEARCH THIS CLASS, SUBCLASS:
862.041 for dynamometers comprising means responsive to plural torques wherein more structure of the force measuring device is recited than is necessary to describe the calibrating apparatus.
862.08 for a device for measuring torque, work, or power comprising sensing means responsive to a force couple or moment of force that induces or resists rotation of a body about a point or axis combined with a calibrating apparatus wherein more structure of the force measuring device is recited than is necessary to describe the calibrating apparatus.

Electrical:
This subclass is indented under subclass 1.09. Subject matter wherein either (a) the apparatus for proving or calibrating or (b) the device being proven or calibrated comprises means for having an effect resulting from the existence of stationary or moving electric charges.

Wrench:
This subclass is indented under subclass 1.09. Subject matter wherein either (a) the apparatus for proving or calibrating or (b) the device being proven or calibrated is a hand or power tool with fixed or adjustable jaws for twisting or turning an object.

SEE OR SEARCH THIS CLASS, SUBCLASS:
862.21 for torque measuring wrench.

Weight:
This subclass is indented under subclass 1.08. Subject matter wherein either (a) the apparatus for proving or calibrating or (b) the device being proven or calibrated measures, tests, or is responsive to a measure of the heaviness of an object.

SEE OR SEARCH CLASS:
177, Weighing Scales, appropriate subclasses, in particular subclass 50 for a weighing scale combined with testing wherein more structure of the force measuring device is recited than is necessary to describe the calibrating apparatus.

Rotor unbalance or a roller having a smooth surface:
This subclass is indented under subclass 1.08. Subject matter wherein either (a) the apparatus for proving or calibrating or (b) the device being proven or calibrated either (1) determines the amount of or the location of a mass or force causing unbalance in a rotatable body or (2) tests or measures a physical characteristic of or is responsive to a rotating cylindrical shaped body having a surface free of roughness, irregularities, or projections.

SEE OR SEARCH THIS CLASS, SUBCLASS:
66 for rotor unbalance measuring or testing, per se.

Load cell (e.g., strain gauge or piezoelectric sensor):
This subclass is indented under subclass 1.08. Subject matter wherein either (a) the apparatus for proving or calibrating or (b) the device being proven or calibrated comprises a means which produces a signal in response to a force being applied thereto.

SEE OR SEARCH THIS CLASS, SUBCLASS:
760 for measuring a specimen stress or strain or for testing by stress or strain application.
862 for dynamometers where strain in a part of the measuring apparatus itself is utilized as an index of power applied thereto or transmitted thereby.

SEE OR SEARCH CLASS:
411, Expanded, Threaded, Driven, Headed, Tool-Deformed, or Locked-Threaded Fastener, 8 for fastener devices having means functioning to facilitate measuring or to denote the attainment of a desired stress or strain in a fastener device in situ.

Volume of flow, speed of flow, volume rate of flow, or mass rate of flow:
This subclass is indented under subclass 1.01. Subject matter wherein either (a) the apparatus for proving or calibrating or (b) the device being proven or calibrated determines (1) a size or extent of flow of a fluent material, (2) a rate of flow of a fluent material, (3) a rate of motion of a specific dimensional amount of a fluent material, or (4) a response of a fluent material due to an acceleration other than in the normal direction of flow of the fluent material.

SEE OR SEARCH THIS CLASS, SUBCLASS:
170.01 for fluid flow direction determination, in particular subclasses 170.11+ for fluid flow velocity determination.
861 for volume of flowmeters or rate of flowmeters and combinations of which they are a part.

Plug with leak detector:
This subclass is indented under subclass 1.16. Subject matter including a movable barrier for the introduction of a known flow volume combined with a means sensing an undesirable escape of a fluent material through an opening wherein the proving or the calibrating is performed by utilizing the movement of the barrier for the introduction of a known flow volume.

Sphere:
This subclass is indented under subclass 1.16. Subject matter wherein the movement of a three-dimensional surface, having all points of which are equidistant from a fixed point (e.g., a ball), is used for introducing a known flow volume.

Piston:
This subclass is indented under subclass 1.16. Subject matter wherein the movement of a solid cylinder or disk that fits snugly into a large cylinder and moves back and forth
under fluid pressure or displaces or compresses fluid is utilized for introducing a known flow volume.

With plural pistons:
This subclass is indented under subclass 1.19. Subject matter wherein the movement of more than one piston in a cylinder is utilized for introducing a known flow volume.

With magnetic or optical sensor:
This subclass is indented under subclass 1.19. Subject matter including either (a) a body having properties of attracting materials, as iron, by virtue of a surrounding field of force created by motion of its atomic electrons and the alignment of its atoms which change in response to the movement of the piston or (b) a body whose response to light changes in response to the movement of the piston.

SEE OR SEARCH CLASS:
250, Radiant Energy, for a photocell circuit generating positional information.
324, Electricity: Measuring and Testing, 200 for measuring using a magnetic sensor, per se, especially subclasses 207.11+ for determination of a displacement using a magnetic sensor, per se.
356, Optics: Measuring and Testing, 372 for optical measuring and testing by mensuration.

With position sensing switch:
This subclass is indented under subclass 1.19. Subject matter including a means for opening or closing an electrical circuit or for diverting current from one conductor to another conductor in response to a change in position of the piston.

SEE OR SEARCH CLASS:
200, Electricity: Circuit Makers and Breakers, 61.04 for a liquid level responsive switch.

Tracer:
This subclass is indented under subclass 1.16. Subject matter comprising either (a) an identification substance that can be followed through the course of a process, providing information on the pattern of events in the process or on the redistribution of parts or elements involved (i.e., a tracer substance) and a detector means wherein (1) the tracer substance is introduced into the fluid at a fixed rate and (2) the detector means is placed downstream of the fluid flow and is responsive to a concentration of a tracer substance or (b) a fixed concentration of an identification substance that can be followed through the course of a process, providing information on the pattern of events in the process or on the redistribution of parts or elements involved (i.e., a tracer substance) and a detector means wherein (1) the fixed concentration of the tracer substance is introduced into the fluid and (2) the detector means is placed downstream of the fluid flow and is responsive to the rate of introduction of the fixed concentration of the substance.
(1) Note. For the purpose of this subclass, a body or substance that moves along with the fluid flow without impeding the fluid flow is a tracer.

SEE OR SEARCH THIS CLASS, SUBCLASS:
170.04 for determining the direction of fluid flow by use of a tracer.
861.05 for determining a fluid flow rate by measuring the time required for a tracer placed in the fluid to travel from one position to another.

SEE OR SEARCH CLASS:
250, Radiant Energy, appropriate subclasses for an invisible radiation tracer for measuring fluent flow, especially 259 for the use of tracer material in a well to test for leakage into or out of a well, subclasses 302+ for flow metering using invisible radiation type tracer methods, subclasses 306+ for rate of flow testing using charge particles, subclass 356.2 for flow metering using a radioactive tracer, and subclass 359.1 for use of invisible radio tracers for fluent material level tests.
378, X-Ray or Gamma Ray Systems or Devices, subclass 51 for X-ray devices which may include flow metering.

Orifice or restriction:
This subclass is indented under subclass 1.16. Subject matter wherein either (a) the proving or calibrating apparatus or (b) the device being proven or calibrated either comprises (1) an opening sending out a controlled amount of flow of the fluent material or (2) a structure allowing a controlled amount of flow of the fluent material.

SEE OR SEARCH THIS CLASS, SUBCLASS:
861.52 for utilizing an apparatus for measuring a differential device having a restriction to make a volume or rate of flow determination, especially subclasses 861.61+ for utilizing an apparatus for measuring a differential device having a restriction or orifice to make a volume or rate of flow determination.

Nozzle or venturi:
This subclass is indented under subclass 1.25. Subject matter wherein the proving or calibrating apparatus or the device being proven or calibrated comprises (a) a tube having a taper or a constriction through which the fluent material passes or (b) a means having flared ends connected by a constricted middle through which the fluent material passes.

SEE OR SEARCH THIS CLASS, SUBCLASS:
861.62 for utilizing an apparatus for measuring a differential device having a restriction and a flow nozzle to make a volume or rate of flow determination.

Turbine, geared meter, pulse activated or counter:
This subclass is indented under subclass 1.16. Subject matter wherein either (a) the apparatus for proving or calibrating the device or (b) the device being proven or calibrated comprises either (1) a motor operated by water, steam, or air directed against cups, blades, or vanes on the rim of a wheel (i.e., turbine), (2) an instrument that measures fluent material passing through it via the use of rotary driven indicating members (i.e., geared meter), (3) a means having a property which changes in response to regularly occurring stimuli (i.e., pulse activated), or (4) a meter for totaling a parameter related to flow (i.e., counter).

Turbine or geared meter:
This subclass is indented under subclass 1.27. Subject matter wherein either (a) the apparatus for proving or calibrating or (b) the device being proven or calibrated includes either (1) a motor operated by water, steam, or air directed against cups, blades, or vanes on the rim of a wheel or (2) an instrument that measures fluent material passing through it via the use of rotary driven indicating members (i.e., geared meter).

SEE OR SEARCH THIS CLASS, SUBCLASS:
861.79 for utilizing a turbine to make a volume or rate of flow determination.

Anemometer or pitot tube:
This subclass is indented under subclass 1.16. Subject matter wherein either (a) the apparatus for proving or calibrating the device or (b) the device being proven or calibrated includes either (1) a means for measuring speed of wind or (2) a means that includes a tube which is placed in a moving body of fluid and is used to measure a kinetic head.

SEE OR SEARCH THIS CLASS, SUBCLASS:
861.84 for utilizing anemometer to make a volume or rate of flow determination.

With liquid level monitor or timer:
This subclass is indented under subclass 1.16. Subject matter including (a) an apparatus for determining a predetermined level or depth of a body of liquid or sensing a predetermined level or depth of body of liquid or (b) an apparatus for measuring the time for travel of a fluid from one point to another.

SEE OR SEARCH THIS CLASS, SUBCLASS:
1.73 for calibrating liquid level measuring devices.
290 for liquid level measuring, per se.

Prover bell:
This subclass is indented under subclass 1.31. Subject matter which includes a bell-shaped object for introducing a known volume into (a) the apparatus for proving or calibrating or (b) the device being proven or calibrated.

With floating element or weighing:
This subclass is indented under subclass 1.16. Subject matter wherein (a) the apparatus for proving or calibrating the device or (b) the device being proven or calibrated includes either (1) an element which lies in a liquid without sinking or which is suspended in a gas or (2) an element for measuring the heaviness of the fluent material.

With signal processing, span or set point adjustment (e.g., zero correction):
This subclass is indented under subclass 1.16. Subject matter wherein the apparatus for calibrating or proving comprises means for (a) performing a significant operation on an electrical signal in accordance with an algorithm or electronic circuitry, (b) performing an arithmetical or some limited logic operation to adjust a multiplier or scale, or (c) adjusting a base value (span) or an offset (e.g., zero correction).

SEE OR SEARCH THIS CLASS, SUBCLASS:
1.88 for a proving or calibrating apparatus or a device being proven or calibrated other than a volume of flow, speed of flow, volume rate of flow, or mass rate of flow involving span or zero setting.
861.01 for a flowmeter with indirect temperature or density compensation.

With pressure measurement or plural flowmeters:
This subclass is indented under subclass 1.16. Subject matter wherein either (a) the apparatus for proving or
calibrating or (b) the device being proven or calibrated comprises (1) means for determining a force per unit area exerted by the fluid or (2) more than one means for measuring a flow of a fluent material.

SEE OR SEARCH THIS CLASS, SUBCLASS:
1.57 for a proving or calibrating apparatus or a device being proven or calibrated other than a volume of flow, speed of flow, volume rate of flow, or mass rate of flow type and utilizing fluent pressure measurement.
700 for a fluid pressure gauge, per se.

Metering dispenser:
This subclass is indented under subclass 1.16. Subject matter wherein either (a) the apparatus for proving or calibrating a device or (b) the device being proven or calibrated is a measuring means which issues out fluent material in portions.

SEE OR SEARCH THIS CLASS, SUBCLASS:
168 for the testing of pumps or hydraulic equipment.

Speed, velocity, or acceleration:
This subclass is indented under subclass 1.01. Subject matter wherein either (a) the apparatus for proving or calibrating or (b) the device being proven or calibrated detects or determines either (1) a time rate of change of position of a body (i.e., speed), (2) or a time rate of change of position of a body in a given direction (i.e., or velocity), or (3) a time rate of change of speed or velocity of a body (i.e., acceleration).

SEE OR SEARCH THIS CLASS, SUBCLASS:
121 for other than purely electrically or purely optically measuring speed, velocity, or acceleration in testing a vehicle brake.
167 for other than purely electrically or purely optically measuring speed, velocity, or acceleration in testing a projectile.
178 for other than a purely electrically or a purely optically measuring speed, velocity, or acceleration to test
navigational instrument.
488 for utilizing an inertial element for mechanical speed, velocity, or acceleration measuring and electrical speed, velocity, or acceleration measuring other than a purely electrical or purely optical measuring type utilizing an inertial element; in particular, subclasses 514.01+ for an acceleration measuring apparatus utilizing an inertial element.
507 for comparing the speed of one device with another by measuring speed by means being other than purely electrical or purely optical.
652 for apparatus for sensing vibrations by an inertial element.
861 for fluid flow rate measuring other than by a purely electrical or a purely optical measuring means.

SEE OR SEARCH CLASS:
33, Geometrical Instruments, subclass 231 and 232 for straight-line-light ray sighting instruments involving speed; subclasses 300+ for direction sensing and indicating instruments which may involve speed measuring of a non-purely electrical or non-purely optical measuring type, particularly subclasses 318+ wherein a gyroscope is utilized for controlling or stabilizing purposes; and subclasses 391+ for pendulums which may respond to and be calibrated in terms of acceleration.
250, Radiant Energy, appropriate subclasses for measuring invisible light to measure speed where no manual manipulation is involved.
324, Electricity: Measuring and Testing, 160 for purely electrical speed measuring.
356, Optics: Measuring and Testing, appropriate subclasses for measuring visible light to determine speed.

Accelerometer utilizing an inertial element:
This subclass is indented under subclass 1.37. Subject matter wherein the device being proven or calibrated comprises an inertial member having an intrinsic or relational property which changes in response to a time rate of change of speed or velocity of a body which can be used to measure acceleration.

SEE OR SEARCH THIS CLASS, SUBCLASS:
491 for an acceleration measuring apparatus or method including means retaining a reading of maximum acceleration.
503.3 for determining speed by utilizing a gyroscope for combining acceleration and time.
504.03 for using gyroscopic or Coriolis effect on an inertial element to determine both angular rate and linear acceleration.
652 for an apparatus sensing vibrations by use of an inertial member.
866.2 for a process or an apparatus for measuring a time rate of change in a sensed condition not provided for elsewhere.

SEE OR SEARCH CLASS:
116, Signals and Indicators, 28 for a mechanical indicator, per se, which provides a humanly perceptible signal in response to acceleration and includes no quantitative measuring means.
310, Electrical Generator or Motor Structure, subclass 329 for an inertia operated mechanical energy coupling means for a piezoelectric element or device.
324, Electricity: Measuring and Testing, subclass 162 for a purely electrical speed measuring means including an electrical accelerometer which senses acceleration by means other than an inertial element.
340, Communications: Electrical, subclass 669 for an electrical indicator or alarm which provides a humanly perceptible signal in response to a predetermined acceleration and provides no indication of a quantitative measurement.
356, Optics: Measuring and Testing, for an apparatus or a process for determining acceleration by measuring visible light and involving no mechanical manipulation.
361, Electricity: Electrical Systems and Devices, 280 for an acceleration responsive capacitor.

Involving pendulum or impact:
This subclass is indented under subclass 1.38. Subject matter wherein either (a) the inertial member either comprises or is supported by an object suspended from a fixed support so that it is free to swing back and forth or (b) the device is responsive to a force resulting from collision of
one body with another.

SEE OR SEARCH THIS CLASS, SUBCLASS:
504.04 for a multi-sensor for determination of angular rate using gyroscopic or Coriolis effect combined with a determination of linear acceleration and including a vibratory inertial body.
504.12 for measuring angular velocity using gyroscopic or Coriolis effect on a vibratory inertial body.
514.15 for acceleration measuring by means of a vibratory inertial mass.
514.29 for measuring acceleration by means of a vibrating sensor.
514.36 for acceleration measuring by means of a pendulum type inertial element wherein no rebalance is recited.
570 for a vibrator, per se, used in testing or the testing of a vibrator.

Optical or magnetic sensing:
This subclass is indented under subclass 1.37. Subject matter comprising a sensing means whose characteristic changes in response to a light beam being modified in accordance with the change in the property of an inertial member due to the speed or velocity of the body or the sensing means comprising a body whose magnetic characteristic changes in response to the change in the property of the inertial member due to the speed or velocity of the body.

SEE OR SEARCH THIS CLASS, SUBCLASS:
653 for an inertial type vibration sensing means having a light beam indicator.

SEE OR SEARCH CLASS:
250, Radiant Energy, 227.14 for a condition responsive light guide and subclasses 231.1+ for a light valve actuated by an external dynamic physical quantity.
335, Electricity: Magnetically Operated Switches, Magnets, and Electromagnets, for a magnet or an electromagnet, per se.
336, Inductor Devices, subclass 30 for an inductor device having an acceleration responsive inductance adjusting means.

Timing apparatus (e.g., fuse, camera, or shutter):
This subclass is indented under subclass 1.01. Subject matter wherein the device being proven or calibrated measures passage of time.

Chronometer (e.g., clock, watch, or watch unbalance):
This subclass is indented under subclass 1.42. Subject matter wherein the device being proven or calibrated includes means providing a humanly perceptible indication of a passage of time.

SEE OR SEARCH CLASS:
368, Horology: Time Measuring Systems or Devices, appropriate subclasses for a timer, per se.

Using antenna or radio frequency (RF):
This subclass is indented under subclass 1.43. Subject matter wherein either (a) the apparatus for proving or calibrating the device or (b) the device being proven or calibrated either (1) includes a metallic device for transmitting or receiving electromagnetic waves (i.e., an antenna) or (2) utilizes a frequency lying in the range of frequencies, between about 3 kilohertz and 300 gigahertz, over which electromagnetic radiation is used in radio transmission (i.e., radio frequency).

SEE OR SEARCH CLASS:
342, Communications: Directive Radio Wave Systems and Devices (e.g., Radar, Radio Navigation), appropriate subclasses for an antenna, per se.

Using optical sensor or element:
This subclass is indented under subclass 1.43. Subject matter wherein either (a) the apparatus for proving or
calibrating the chronometer or (b) the chronometer being proven or calibrated includes a means whose optical characteristic changes in response to a stimulus.

SEE OR SEARCH CLASS:
250, Radiant Energy, appropriate subclasses for an optical sensor, per se.

With sound sensor:
This subclass is indented under subclass 1.45. Subject matter wherein either (a) the apparatus for proving or calibrating the chronometer or (b) the chronometer being proven or calibrated includes a means whose characteristic changes in response to sound.

SEE OR SEARCH THIS CLASS, SUBCLASS:
649 for a vibration or sound testing sensor.

Resilient element:
This subclass is indented under subclass 1.45. Subject matter wherein either (a) the apparatus for proving or calibrating the chronometer or (b) the chronometer being proven or calibrated includes a means having the capacity of returning to an original form immediately upon the withdrawal of a force which causes compression or distortion.

Using sound sensor or piezoelectric vibration sensor:
This subclass is indented under subclass 1.43. Subject matter wherein either (a) the apparatus for proving or calibrating the chronometer or (b) the chronometer being proven or calibrated includes either (1) a means having a characteristic which changes in response to sound or (2) an element which produces electricity in response to pressure being applied thereto by a detection of vibration.
(1) Note. A tick detector, unless otherwise set forth, is found here.

SEE OR SEARCH THIS CLASS, SUBCLASS:
649 for a vibration or sound testing sensor.

Plural watches or plural sensors:
This subclass is indented under subclass 1.48. Subject matter wherein the device being proven or calibrated includes at least two chronometers or transducers.

Resilient element:
This subclass is indented under subclass 1.48. Subject matter wherein either (a) the apparatus for proving or calibrating the chronometer or (b) the chronometer being proven or calibrated includes a means having a capacity of returning to an original form immediately upon the withdrawal of a force which causes compression or distortion.

Plural watches:
This subclass is indented under subclass 1.43. Subject matter wherein the devices being proven or calibrated includes at least two chronometers.

With resilient element:
This subclass is indented under subclass 1.43. Subject matter wherein either (a) the apparatus for proving or calibrating the chronometer or (b) the chronometer being proven or calibrated includes a means having a capacity of returning to an original form immediately upon the withdrawal of a force which causes compression or distortion.

Coil spring:
This subclass is indented under subclass 1.53. Subject matter wherein the resilient element is a spirally wound elastic member.

SEE OR SEARCH CLASS:
267, Spring Devices, 166 for coil springs, per se.

Plural coil springs:
This subclass is indented under subclass 1.54. Subject matter wherein the resilient element comprises at least two spirally wound elastic members.

Optical instrument (e.g., camera shutter) or optical sensor:
This subclass is indented under subclass 1.42. Subject matter wherein the timer being proven or calibrated is either (a) an instrument which is operated by light or (b) an element whose characteristic changes in response to light.

Fluid pressure:
This subclass is indented under subclass 1.01. Subject matter wherein the device being proven or calibrated either (a) measures fluid pressure or (b) is responsive to fluid pressure.

SEE OR SEARCH THIS CLASS, SUBCLASS:
700 for a fluid pressure gauge.

Vacuum:
This subclass is indented under subclass 1.57. Subject matter wherein either (a) the apparatus for proving or calibrating the fluid pressure measuring device uses subatmospheric pressure or (b) the device being proven or calibrated is responsive to or measures a subatmospheric pressure.

With signal correction or processing:
This subclass is indented under subclass 1.57. Subject matter including either (a) a means for (1) performing an operation on an electrical signal to or from the fluid pressure measuring device in accordance with a set of rules which result in a significant change in the signal or (2) performing an arithmetical or some limited logic operation upon or with a signal to or from the fluid pressure responsive or measuring device in a systematic manner or (b) a means for adjusting an electrical signal either from the fluid pressure responsive device or the fluid pressure measuring device to a desired value.

Span:
This subclass is indented under subclass 1.59. Subject matter wherein the pressure responsive device is tested or calibrated for accuracy at at least two pressures.

Zero:
This subclass is indented under subclass 1.59. Subject matter wherein the pressure responsive device is adjusted or checked for accuracy by checking its response to a reference pressure.

With reference source or attachment therefor:
This subclass is indented under subclass 1.59. Subject matter including (a) a means for providing a standard or a known pressure during the proving or calibration of either the device which (1) measures fluid pressure or (2) is responsive to fluid pressure or (b) an element adapted to be affixed to a means for providing a standard or a known pressure during the proving or calibrating of the device which either (1) measures pressure or (2) is responsive to fluid pressure.

Varying:
This subclass is indented under subclass 1.63. Subject matter wherein the provided standard or the known pressure varies during the proving or calibrating of the fluid pressure measuring or the fluid pressure responsive device.

Dead weight type:
This subclass is indented under subclass 1.57. Subject matter including a reference pressure source comprising a known weight acting as a sole force or pressure on a known area.

Varying:
This subclass is indented under subclass 1.57. Subject matter including means providing a standard or the known pressure which varies during the proving or calibrating of either the fluid pressure measuring device or the fluid pressure responsive device.

Using or containing liquid:
This subclass is indented under subclass 1.66. Subject matter wherein either (a) the apparatus proving or calibrating the fluid pressure measuring device or the fluid pressure responsive device, (b) the pressure measuring means, or (c) the fluid pressure responsive means uses or includes a liquid.

With piston and cylinder:
This subclass is indented under subclass 1.57. Subject matter including a cylindrical solid element movable in and snugly fitted in a cylindrical housing and wherein either (a) the apparatus for proving or calibrating the fluid pressure measuring device or the fluid pressure responsive device, (b) the device for measuring the fluid pressure, or (c) the device responsive to the fluid pressure includes the solid element and the cylindrical housing.

Using or containing liquid:
This subclass is indented under subclass 1.57. Subject matter wherein either (a) the apparatus proving or calibrating the fluid pressure measuring device or the fluid pressure responsive device, (b) the pressure measuring means, or (c) the fluid pressure responsive means uses or includes a liquid.

Pressure activated device:
This subclass is indented under subclass 1.57. Subject matter wherein the pressure responsive device which is being proven or calibrated performs a nonpressure function in response to pressure.

Valve:
This subclass is indented under subclass 1.71. Subject matter wherein the pressure activated device comprises a body that regulates the flow of gases, liquids, or loose materials through structure, as a pipe, or through an aperture by opening, closing, or obstructing a port or a passageway or movable control element of such body.

Liquid level or volume measuring apparatus:
This subclass is indented under subclass 1.01. Subject matter wherein either (a) the apparatus for proving or calibrating the device or (b) the device being proven or calibrated measures either (1) a height of liquid contained in a body or (2) an amount of material contained in a body.

SEE OR SEARCH THIS CLASS, SUBCLASS:
149 for volume measuring, per se.
290 for liquid level measuring or testing, per se.

Volumetric dispenser (e.g., pipette):
This subclass is indented under subclass 1.73. Subject matter wherein either (a) the apparatus for proving or calibrating the device or (b) the device being proven or calibrated deals out a fixed amount of a content of a body in portions.

Angle, direction, or inclination:
This subclass is indented under subclass 1.01. Subject matter wherein either (a) the apparatus for proving or calibrating the device or (b) the device being proven or calibrated (1) measures the figure formed by two lines diverging from a common point (i.e., angle), (2) a position to which motion or another position is referred (i.e., direction), or (3) a deviation from a horizontal or vertical reference point (i.e., inclination).

SEE OR SEARCH CLASS:
33, Geometrical Instruments, appropriate subclasses for instruments for measuring an angle, a direction, or an inclination.

Compass:
This subclass is indented under subclass 1.75. Subject matter wherein either (a) the apparatus for proving or calibrating the device or (b) the device being proven or calibrated indicates direction (north, south, east or west or combinations thereof).

SEE OR SEARCH CLASS:
33, Geometrical Instruments, appropriate subclasses for instruments for measuring an angle, a direction, or an inclination.

Gyroscope:
This subclass is indented under subclass 1.75. Subject matter including a spinning mass, usually a disk or wheel,
the spin axis of which turns between two low friction supports and maintains its angular orientation with respect to inertial coordinates when not subjected to external torques wherein the spinning mass is either (a) a part of the apparatus for proving or calibrating the device or (b) the device being proven or calibrated.

SEE OR SEARCH CLASS:
74, Machine Element or Mechanism, 5 for special features of gyroscope, per se, and especially subclass 5.22 as the generic place for gyroscopes combined with other structure.

Aircraft, inertial navigation, or attitude:
This subclass is indented under subclass 1.75. Subject matter wherein either (a) the apparatus for proving or calibrating the device includes an aircraft or (b) the device being proven or calibrated either (1) is used in inertial navigation (e.g., monitoring aircraft angle, direction, or navigation), (2) is responsive to inertial navigation, or (3) is responsive to attitude.

SEE OR SEARCH THIS CLASS, SUBCLASS:
178 for navigation testing.

Displacement, motion, distance, or position:
This subclass is indented under subclass 1.01. Subject matter wherein the device being proven or calibrated measures a vector or magnitude of a vector, the act or process of changing location, the length of a line segment joining two points, or where an object is placed.

Length, width, or height:
This subclass is indented under subclass 1.79. Subject matter wherein the device being proven or calibrated measures a spatial extent.

Apparatus for measuring by use of vibration or apparatus for measuring vibration (e.g., acoustic or ultrasonic):
This subclass is indented under subclass 1.01. Subject matter wherein either (a) the apparatus being proven or calibrated undergoes a rapid linear motion about an equilibrium position or (b) the apparatus being proven or calibrated, tested, or adjusted measures a rapid linear motion of a body about an equilibrium position.

Liquid:
This subclass is indented under subclass 1.82. Subject matter wherein either the (a) apparatus for proving or calibrating the device or (b) the device being proven or calibrated uses or includes a fluid exhibiting a readiness to flow, little or no tendency to disperse, or relatively high incompressibility.

Rotary or rotor unbalance:
This subclass is indented under subclass 1.82. Subject matter wherein either the (a) apparatus for proving or calibrating the device or (b) the device being proven or calibrated includes either (1) a device undergoing angular motion or (2) an apparatus for determining the amount and/or location of masses or force causing unbalance in rotatable bodies.

SEE OR SEARCH THIS CLASS, SUBCLASS:
66 for measuring rotor unbalance, per se.
455 for a propeller rotor unbalance test.

Seismic (e.g., geophone) or with optical sensor:
This subclass is indented under subclass 1.82. Subject matter wherein either (a) the apparatus for proving or calibrating the device or (b) the device being proven or calibrated includes either (1) a device relating to an earthquake or earth tremor or (2) a device whose optical characteristic changes in response to sensing vibration.

SEE OR SEARCH THIS CLASS, SUBCLASS:
653 for a sensing apparatus having an inertial element with a light beam indicator.

SEE OR SEARCH CLASS:
367, Communications, Electrical: Acoustic Wave Systems and Devices, subclass 13 for testing, monitoring, or calibrating acoustic wave systems or devices used for electrical communications.

Reference standard detail:
This subclass is indented under subclass 1.82. Subject matter including a means for providing reference criterion which is used for or intended to be used for comparison purposes in order to prove, calibrate, test, or adjust the measuring, testing, or condition responsive device and wherein significance is attributed to the means for providing the reference criterion.

SEE OR SEARCH CLASS:
204, Chemistry: Electrical and Wave Energy, 427 for an electrolytic gas sample sensor, per se, combined with a gas reference material; and subclass 435 for a standard reference electrode in an electrolytic analysis or testing apparatus.
356, Optics: Measuring and Testing, subclass 243 for an apparatus for measuring or testing visible light including structure forming a basis for comparison with a specimen or a portion thereof under test.
436, Chemistry: Analytical and Immunological Testing, particularly 8 for a composition for standardization, calibration, simulation, or processes of use in preparation for chemical testing.

Centrifuge:
This subclass is indented under subclass 1.01. Subject matter wherein the device being proven or calibrated includes a sample holding device designed to rapidly rotate.

SEE OR SEARCH THIS CLASS, SUBCLASS:
1.02 for (a) an apparatus for proving or calibrating a device for measuring or testing a liquid or a liquid suspension of a solid by use of a centrifuge or (b) proving
or calibrating a device using a centrifuge for measuring or testing a liquid or a liquid suspension of a solid.
53.01 for an analysis of a liquid or a liquid suspension of a solid by use of a centrifuge.

Span or set point adjustment (e.g., zero correction):
This subclass is indented under subclass 1.01. Subject matter wherein the device being proven or calibrated produces an output signal in response to a condition being sensed and wherein the proving, the calibrating, the testing, or the adjustment of the device is made by setting a range of values or a base value for the output.

SEE OR SEARCH THIS CLASS, SUBCLASS:
1.34 for volume of flow, speed of flow, volume rate of flow, or mass rate of flow apparatus which proves or calibrates the device by establishing a span or a zero or a volume of flow, speed of flow, volume rate of flow, or mass rate of flow device being proven or calibrated has a span or a zero value.

Roughness or hardness:
This subclass is indented under subclass 1.01. Subject matter wherein the device being proven or calibrated produces an output signal in response to a condition being sensed and wherein the proving, the calibrating, the testing or the adjustment of the device measures (a) the amount of unevenness of a surface or (b) the amount of resistance of a surface to penetration of an indentor into the surface or the amount of resistance of a surface to scratching.

SEE OR SEARCH THIS CLASS, SUBCLASS:
84 for measuring or testing hardness, per se.

This subclass is indented under the class definition. Subject matter in which a measurement or test is made involving any one or any combination of the operations of abrasion, milling, rubbing, or scuffing, even though the test
is employed as an index of another property, e.g., hardness. These are, in general, "wear" tests.

SEE OR SEARCH THIS CLASS, SUBCLASS:
9 for analogous testing or measuring of frictional resistance, coefficient or characteristic.
862.12 for torque absorption dynamometers of the frictional drag type.

SEE OR SEARCH CLASS:
277, Seal for a Joint or Juncture, for a generic sealing means or process, subclass 321 for a seal combined with means to indicate wear, proper seating, or presence.
434, Education, Demonstration, and Cryptography, for the demonstration of wear characteristics of materials not involving a measurement or a test feature.

This subclass is indented under subclass 7. Subject matter in which any one of the following is the device tested: a wheel tread, tire, vehicle track or roadway.

SEE OR SEARCH THIS CLASS, SUBCLASS:
146 for testing the same devices in other ways.

This subclass is indented under the class definition. Subject matter for measuring or determining the frictional drag or resistance between solid bodies when moved relative to one another.

SEE OR SEARCH THIS CLASS, SUBCLASS:
7 for testing or measuring by abrasion, milling, rubbing, or scuffing, i.e., "wear" tests.
862.11 through 862.18, for torque measuring dynamometers e.g., pony brakes.

This subclass is indented under subclass 9. Subject matter in which the effect of a lubricant upon the frictional drag between relatively movable solid bodies is determined, there being means for applying or maintaining the supply of lubricant.
(1) Note. These tests are usually termed tests of the lubricant.

SEE OR SEARCH THIS CLASS, SUBCLASS:
7 for "wear" tests involving application of a lubricant.
32 for determination of specific gravity or density of lubricants.
53.01 for determination of viscosity of lubricants and other miscellaneous tests of lubricants.

SEE OR SEARCH CLASS:
434, Education and Demonstration, and Cryptography, subclass 388, for lubricant demonstration devices not involving measuring or testing features.

TESTING IMPACT DELIVERING DEVICE (E.G., A HAMMER):
This subclass is indented under the class definition. Subject matter comprising an apparatus or method for testing a device which delivers an impact while in use.

SEE OR SEARCH THIS CLASS, SUBCLASS:
1.08 for proving or calibrating a device responsive to force, torque, work, or mechanical power.
12.01 for testing by impact.
112 for power plant or unit efficiency measuring.
167 for projectile testing, per se.
488 for speed or acceleration measuring, per se.
862.381 for force measuring, per se.

SEE OR SEARCH CLASS:
346, Recorders, subclass 7 and 129 for a record tracer movement responsive to inertial or mass inclination.
374, Thermal Measuring and Testing, 31 for calorimetry, per se.

Shot peener:
This subclass is indented under subclass 11.01. Subject matter wherein the device being tested is a means for providing an acceleration to a pellet for the purpose of impacting.

SEE OR SEARCH THIS CLASS, SUBCLASS:
7 for testing by abrasion, milling, rubbing, or scuffing, per se.
37.5 for measuring dimension, size, and shape using fluid pressure.
104 for surface testing or measuring, per se.
760 for testing for specimen stress or strain, or testing by stress or strain application.

Pile driving hammer:
This subclass is indented under subclass 11.01. Subject matter wherein the device being tested comprises an impact hammer for driving a columnar structure into the earth.

SEE OR SEARCH THIS CLASS, SUBCLASS:
12.01 for testing by impact, per se.
82 for an impactor for testing hardness.
84 for testing soil hardness by driving a pile into soil.
488 for speed and acceleration measuring, per se.

SEE OR SEARCH CLASS:
72, Metal Deforming, subclass 53 for metal deforming by shot blasting.
405, Hydraulic and Earth Engineering, 232 for a process or an apparatus for installing a pile.

TESTING OF SHOCK ABSORBING DEVICE (E.G., AUTOMOBILE SHOCK ABSORBER, GUN RECOIL APPARATUS, ETC.):
This subclass is indented under the class definition. Subject matter comprising an apparatus or method for testing a device whose function while it is in use is to absorb shock.

SEE OR SEARCH THIS CLASS, SUBCLASS:
12.01 for testing by shock.
79 for testing for hardness by observing rebound.
112 for a power plant or unit efficiency measurement.

SEE OR SEARCH CLASS:
105, Railway Rolling Stock, subclass 392.5 for a shock absorber for a railway vehicle.
188, Brakes, 266 for a fluid-type shock absorber for a railway vehicle.
213, Railway Draft Appliances, subclass 1 for a one-shot shock absorber and subclass 32 for a draft gear assembly, per se.
248, Supports, appropriate subclass for support-type shock absorbers.
267, Spring Devices, appropriate subclass for spring-type shock absorbers.
340, Communications: Electrical, 500 for an electrical indicator which produces a humanly perceptible signal in response to the attainment of a predetermined condition; particularly, subclass 665 for a predetermined mechanical force.

Torsional vibration damper:
This subclass is indented under subclass 11.04. Subject matter wherein the device being tested is used to lessen or reduce the amplitude of torsional vibration.

SEE OR SEARCH THIS CLASS, SUBCLASS:
574 for using vibration for testing for mechanical impedance, per se.

SEE OR SEARCH CLASS:
74, Machine Element or Mechanism, appropriate subclass for subject matter of that class type combined with vibration dampers.
188, Brakes, 378 for vibration dampers, per se.

Railway draft gear:
This subclass is indented under subclass 11.04. Subject matter wherein the device being tested transmits pull from one railway car to another railway car.

SEE OR SEARCH CLASS:
213, Railway Draft Appliances, subclass 1 for a one-shot shock absorber and subclass 32 for a draft gear assembly, per se.

In situ vehicle suspension:
This subclass is indented under subclass 11.04. Subject matter wherein the device being tested is a structure which suspends a vehicle body on its running gear.

SEE OR SEARCH CLASS:
280, Land Vehicles, subclass 784 for a vehicle frame having an impact shock absorber.

By applying reciprocating or oscillating motion:
This subclass is indented under subclass 11.07. Subject matter wherein the testing is done by applying a periodic motion to the device.

SEE OR SEARCH THIS CLASS, SUBCLASS:
570 for vibration testing, per se.

SEE OR SEARCH CLASS:
280, Land Vehicles, subclass 784 for a vehicle frame having
an impact shock absorber.

By applying reciprocating or oscillating motion:
This subclass is indented under subclass 11.04. Subject matter wherein the testing is done by applying a back-and-forth periodic motion to the device.

SEE OR SEARCH THIS CLASS, SUBCLASS:
570 for vibration testing, per se.

TESTING BY IMPACT OR SHOCK:
This subclass is indented under the class definition. Subject matter comprising an apparatus or method for testing a specimen by subjecting it to one or more sudden blows.

SEE OR SEARCH THIS CLASS, SUBCLASS:
11.01 for testing an impact delivering device.
11.04 for the testing of a shock absorbing apparatus.
35.14 for testing a body by measuring the effect of an explosion on the body.
78 for hardness testing.
161 for spring testing, per se.
167 for testing ordnance or projectile.
570 for testing by vibration, per se.
788 for loading a specimen to determine shear or strain.
862 for measuring a force or a force component.

SEE OR SEARCH CLASS:
116, Signals and Indicators, subclass 32 for a collision released identification tag, per se, and subclass 203 for a mechanical indicator, per se, which provides a humanly perceptible signal in response to the presence or absence of an impact.
173, Tool Driving or Impacting, appropriate subclasses for an impacting device, per se.
188, Brakes, appropriate subclasses for an internal resistance motion retarder, per se.
251, Valves and Valve Actuation, appropriate subclasses for a fluid actuated valve, per se.
267, Spring Devices, 136 for a resilient shock or vibration absorber, per se.
340, Communications: Electrical, for an electrical indicator or alarm which provides a humanly perceptible signal in response to a predetermined force.

Resilient ball (e.g., golf ball, baseball, etc.):
This subclass is indented under subclass 12.01. Subject matter wherein the specimen being tested is an elastic spherical body usually used in games or sports.

SEE OR SEARCH THIS CLASS, SUBCLASS:
79 for hardness testing by measuring rebound.
167 for projectile testing, per se.
865.3 for the testing of a body by subjecting it to motion, per se.

SEE OR SEARCH CLASS:
124, Mechanical Guns and Projectors, appropriate subclass for mechanical guns and projectors.

Typewriting ribbon or carbon paper:
This subclass is indented under subclass 12.01. Subject matter wherein the specimen being tested is either a typewriter ribbon or carbon paper.
(1) Note. Carbon paper is used in the popular sense of the word to mean that type of paper which transfers a surface coating when pressed against a surface, as by a typewriter key.

SEE OR SEARCH THIS CLASS, SUBCLASS:
150 for testing of a coating, per se.
159 for a filament testing, per se.

Accelerated or decelerated specimen (e.g., propelled or dropped specimen support carriage):
This subclass is indented under subclass 12.01. Subject matter wherein either the specimen or the specimen and its support is subjected to a sudden change in velocity.

SEE OR SEARCH THIS CLASS, SUBCLASS:
167 for projectile testing, per se.
788 for applying a load to a specimen in order to test for stress or strain.
865.3 for testing by imparting motion to a specimen.

Particle or projectile specimen:
This subclass is indented under subclass 12.04. Subject matter wherein the specimen is either a particle or a projectile.

SEE OR SEARCH THIS CLASS, SUBCLASS:
167 for other types of testing of projectiles.
570 for applying a load to a specimen in order to test for stress or strain.
865.3 for testing by imparting motion to a specimen.

Dropped:
This subclass is indented under subclass 12.04. Subject matter wherein the change in velocity of the specimen is caused by dropping the specimen or the specimen and its support onto a fixed surface.

SEE OR SEARCH THIS CLASS, SUBCLASS:
79 for testing for hardness using rebound.
760 for applying a load to a specimen in order to test for
stress or strain.
865.3 for testing by imparting motion to a specimen.

By hydraulic or pneumatic forces:
This subclass is indented under subclass 12.04. Subject matter wherein the change in velocity of the specimen is caused by either (a) liquid pressure or (b) air pressure.

SEE OR SEARCH THIS CLASS, SUBCLASS:
82 for hydraulically driven impact-type hardness testing.
167 for other types of testing of projectiles.
760 for applying a load to a specimen by hydraulic or pneumatic loading means in order to test for stress or strain.
865.3 for testing by imparting motion to a specimen.

SEE OR SEARCH CLASS:
124, Mechanical Guns and Projectors, subclass 73 for fluid pressure actuated guns and projectors.
251, Valves and Valve Actuation, appropriate subclass for valve and fluid actuated valves, per se.
406, Conveyors: Fluid Current, appropriate subclass for a fluid current conveyor, per se.

Specimen directly subjected to a fluid pressure pulse or wave:
This subclass is indented under subclass 12.01. Subject matter wherein the source of the blow to the specimen is a fluid pressure pulse or wave.

SEE OR SEARCH CLASS:
406, Conveyors: Fluid Current, appropriate subclass for a fluid current conveyor, per se.

Specimen impactor detail:
This subclass is indented under subclass 12.01. Subject matter wherein significance is attributed to the device which subjects a specimen to a blow.

Particle or projectile:
This subclass is indented under subclass 12.09. Subject matter wherein the impactor is either a particle or a projectile.

Reciprocating or oscillating:
This subclass is indented under subclass 12.09. Subject matter wherein the impactor moves towards and away from the specimen in such a fashion so as to apply periodic blows to the specimen.

SEE OR SEARCH THIS CLASS, SUBCLASS:
570 for vibration testing, per se.

Dropped:
This subclass is indented under subclass 12.09. Subject matter wherein the impactor is released above the specimen and accelerated by gravity until it strikes the specimen.

Pivoted:
This subclass is indented under subclass 12.13. Subject matter wherein the impactor swings about a fixed axis.

GAS CONTENT OF A LIQUID OR A SOLID:
This subclass is indented under the class definition.
Subject matter comprising a process or an apparatus for determining the nature or amount of gas in a substance other than gas.

SEE OR SEARCH THIS CLASS, SUBCLASS:
23.20 for a process or apparatus for analyzing gas.
73 for a process or apparatus for determining the moisture content of materials.

SEE OR SEARCH CLASS:
95, Gas Separation: Processes, for processes of gas separation, per se (i.e., not combined with analysis steps).
96, Gas Separation: Apparatus, for apparatus for gas separation, per se (i.e., not combined with analysis means).
204, Chemistry: Electrical and Wave Energy, 400 for an apparatus which utilizes electrolytic action for analysis or testing.
422, Chemical Apparatus and Process Disinfecting, Deodorizing, Preserving, or Sterilizing, 68 for an apparatus which utilizes a chemical reaction to determine the gas content of a liquid or solid.
436, Chemistry: Analytical and Immunological Testing, for a process which utilizes a chemical reaction to determine the gas content of a liquid or a solid, particularly subclass 68 for determining the gas content of blood.
516, Colloid Systems and Wetting Agents; Subcombinations Thereof; Processes of Making, Stabilizing, Breaking, or Inhibiting, 113 for compositions for or subcombination compositions for or breaking of or inhibiting of colloid systems (e.g., foam breaking, emulsion breaking, dispersion inhibiting, suspension settling, gel breaking, smoke suppressing, coagulating, flocculating), when generically claimed or when there is no hierarchically superior provision in the USPC for the specifically claimed art.

By gas chromatography:
This subclass is indented under subclass 19.01. Subject matter wherein the effluent of a mixture of gases, which has contacted a solvent or sorbent which separates the mixture into fractional components, is successively tested to determine the quantity, quality or identity of a component of the effluent.

SEE OR SEARCH THIS CLASS, SUBCLASS:
23.35 for gas analysis using gas chromatography, and particularly subclass 23.40 for a gas detector which uses gas chromatography to analyze gas.
53.01 for liquid testing, (e.g., liquid chromatography).

SEE OR SEARCH CLASS:
95, Gas Separation: Processes, 82 for processes of gas separation, per se (i.e., not combined with analysis steps), using chromatography.
96, Gas Separation: Apparatus, 101 for apparatus for gas separation, per se (i.e., not combined with analysis means), of the chromatos:graphic type.
204, Chemistry: Electrical and Wave Energy, 400 for electrochemical gas sensors, per se.
210, Liquid Purification or Separation, 660 for a process of removing a constituent from a liquid by sorption, particularly subclasses 656+ for selective sorptions (e.g., chromatography) subclasses 85+ for a liquid separator with recorder or register and subclasses 263+ for a liquid separator utilizing a bed of particulate material.
324, Electricity: Measuring and Testing, particularly 464 for analyzing gas using ionization effects, and appropriate subclasses for testing gas by measuring impedance, admittance, and related quantities.
422, Chemical Apparatus and Process Disinfecting, Deodorizing, Preserving, or Sterilizing, 50 for an apparatus utilizing a chemical reaction to analyze a gas, particularly subclass 89 for gas chromatography.
436, Chemistry: Analytical and Immunological Testing, appropriate subclasses for a process of gas analysis which utilizes a chemical reaction to determine the gas content of a liquid or a solid, and particularly subclass 68 for determining the gas content of blood, and subclasses 161+ for chromatography.

By vibration:
This subclass is indented under subclass 19.01. Subject matter wherein the liquid or solid is subjected to vibratory forces to determine its gas content.

SEE OR SEARCH THIS CLASS, SUBCLASS:
24.01 for detection of gas, per se, by measuring the effect
of the gas being tested on vibration.
570 for testing, per se, using vibration.
861.18 for measuring the volume or rate of flow of fluent material by sensing vibration.

By rate of flow of the gas:
This subclass is indented under subclass 19.01. Subject matter wherein the gas content of the liquid or solid is determined by measuring the rate of flow of the gas.

SEE OR SEARCH THIS CLASS, SUBCLASS:
1.16 for calibration of flow meters.
155 for determining fluid flow in bore holes.
170.07 and 170.11, for determining the rate of flow and direction of flow of fluid in meteorology and oceanology.
181 for determining the speed of a craft with respect to a fluid.
861 for measuring the flow of fluent material, per se.

SEE OR SEARCH CLASS:
48, Gas: Heating and Illuminating, 180.1 for metering and mixing two gases where one is a fuel.
116, Signals and Indicators, for nonelectrical means for giving an alarm upon occurrence of fluid flow.
128, Surgery, 630 for flow-measuring means with structure particularly adapted for placement on or in a living body.
137, Fluid Handling, 98 for a self-proportioning flow system; and subclasses 624.11+ for a programmed or timed valve which meters fluid merely by timing the interval between opening and closing of the valve.
175, Boring or Penetrating the Earth, subclass 48 for measuring the rate of flow drilling fluid.
222, Dispensing, particularly 14, 59+ and 71+ for volume or rate of flow-measuring means having dispensing features or which are used in dispensing combinations.
250, Radiant Energy, particularly subclass 258, 259+, 302+, 356.1, and 432+ for miscellaneous radiant energy responsive devices.
324, Electricity: Measuring and Testing, subclass 306 for flow-measuring means responsive to nuclear induction.
340, Communications: Electrical, 606 for electric means for giving a humanly perceptible indication or signal in response to a predetermined condition, such as flow of a fluid.
356, Optics: Measuring and Testing, 27 for flow-measuring means employing lasers.
377, Electrical Pulse Counters, Pulse Dividers, or Shift Registers: Circuits and Systems, subclass 21 for a system utilizing a pulse counter to measure fluid flow.
700, Data Processing: Generic Control Systems or Specific Applications, subclasses 282-285 for flow control.

By pressure of the gas:
This subclass is indented under subclass 19.01. Subject matter wherein the gas content of the liquid is determined by measuring the pressure of the gas.

SEE OR SEARCH THIS CLASS, SUBCLASS:
24.04 for measuring vapor pressure of gas by vibration.
25.04 for measuring vapor pressure of gas by measuring a thermal property of the gas.
29.01 for determining the vapor pressure of gas being tested.
31.04 for analyzing gas by pressure measurement, per se.
37 for a testing apparatus or process for subjecting a specimen directly to fluid pressure (positive or negative) to determine a property of the specimen.
78 for a device for measuring hardness as an index of fluid pressure, particularly subclass 80 for a tonometer and subclass 81 for a tire hardness gauge.
115 for a process or an apparatus which measures the pressure within an engine to determine its efficiency.
299 for a hydrostatic pressure type of liquid level or depth gauge.
384 for a barometer.
700 for measurement of the pressure of fluent material.
861.42 for a pressure differential measuring device for determining volume or rate of flow.

SEE OR SEARCH CLASS:
128, Surgery, 672 for a blood pressure measuring device.
138, Pipes and Tubular Conduits, 26, for a device of that class type combined with pressure compensator.
200, Electricity: Circuit Makers and Breakers, 81 for a fluid pressure operated switch.
374, Thermal Measuring and Testing, 201 for an expanding fluid type thermometer.

Of a beverage:
This subclass is indented under subclass 19.05. Subject matter wherein the gas content of a potable liquid (i.e., a liquid suitable for consumption by a human being) is determined.

Of metal:
This subclass is indented under subclass 19.01. Subject matter wherein the substance whose gas content is being determined is a metal.

Of concrete, mortar, or plastic while in a fluent state:
This subclass is indented under subclass 19.01. Subject matter wherein the substance whose gas content is being determined is concrete, mortar, or plastic while capable of flowing.

Of mud:
This subclass is indented under subclass 19.01. Subject matter wherein the substance whose gas content is being
determined is a mixture of soil with a liquid.

Of a liquid:
This subclass is indented under subclass 19.01. Subject matter wherein the substance whose gas content is being determined is a substance which exhibits a characteristic readiness to flow, little or no tendency to disperse, and relatively high incompressibility.

SEE OR SEARCH THIS CLASS, SUBCLASS:
19.06 for determining the gas content of a beverage by measuring the pressure of the gas.
53.01 for testing of a liquid or liquid suspension of solids.

Lubricant:
This subclass is indented under subclass 19.1. Subject matter wherein the liquid whose gas content is being determined is a substance capable of reducing friction, heat and wear when introduced as a film between solid surfaces.

Particular separator:
This subclass is indented under subclass 19.01. Subject matter wherein significance is attributed to means for separating the gas from the liquid or solid.

SEE OR SEARCH THIS CLASS, SUBCLASS:
31.07 for a particular separator used in gas analysis, per se.
863.21 for a sampler, per se, which separates constituents of the sample.

SEE OR SEARCH CLASS:
95, Gas Separation: Processes, for processes of gas separation, per se (i.e., not combined with analysis steps).
96, Gas Separation: Apparatus, for apparatus for gas
separation, per se (i.e., not combined with analysis means).

GAS ANALYSIS:
This subclass is indented under the class definition. Subject matter comprising a process or an apparatus for detecting or measuring the composition of, or some constituent of, a gas or gaseous mixture.

SEE OR SEARCH CLASS:
250, Radiant Energy, 253 for the detection of a gas within or emanating from the earth by invisible radiation emanating from the gas naturally or as a result of irradiation by invisible radiation, subclasses 336.1+ for testing of a gas by utilizing an electric signalling device detecting radiation induced or emitted naturally, or detecting infrared, ultraviolet, X-ray, or gamma radiation or neutrons modified by the gas.
324, Electricity: Measuring and Testing, appropriate subclasses for testing and electrical property of a gas.
338, Electrical Resistors, 34 for a resistor, per se, which is responsive to the condition of a gas wherein no quantitative measurements of the gas are disclosed.
340, Communications: Electrical, 632 for an electrical indicator providing a humanly perceptible signal representing a predetermined condition of a gas.
356, Optics: Measuring and Testing, 402 for gas analysis utilizing a colorimeter to determine the shade or color of the gas.
422, Chemical Apparatus and Process Disinfecting, Deodorizing, Preserving, or Sterilizing, 50 for an apparatus utilizing a chemical reaction to analyze gas.
436, Chemistry: Analytical and Immunological Testing, subclass 68 for a process which utilizes a chemical reaction to analyze gas.

With compensation detail (for error or drift correction, etc.):
This subclass is indented under subclass 23.2. Subject matter including means for making a correction for an undesirable variation in a condition within an apparatus or
in a test result due to such condition.

For gas chromatography:
This subclass is indented under subclass 23.21. Subject matter in which the effluent of a mixture of gases, which has contacted a solvent or sorbent which separates the mixture into fractional components, is successively tested to determine the quantity, quality or identify of a component of the effluent.

SEE OR SEARCH THIS CLASS, SUBCLASS:
23.35 through 23.40, for a gas analysis detector, per se, which may be used in gas chromatography.
53.01 for liquid testing (e.g., liquid chromatography).
863 for sample preparation or sampling, per se.

SEE OR SEARCH CLASS:
95, Gas Separation: Processes, 82 for processes of gas separation, per se (i.e., not combined with analysis steps), using chromatography.
96, Gas Separation: Apparatus, 101 for apparatus for gas separation, per se (i.e., not combined with analysis means), of the chromatos:graphic type.
204, Chemistry: Electrical and wave Energy, 400 for an electrochemical gas sensor, per se.
210, Liquid Purification or Separation, 660 for a process of removing a constituent from a liquid by sorption, particularly subclasses 656+ for selective sorptions (e.g., chromatography), subclasses 85 for a liquid separator with recorder or register, and subclasses 263+ for a liquid separator utilizing a bed of particulate material.
324, Electricity: Measuring, and Testing, particularly 464 for analyzing gas using ionization effects, and appropriate subclasses for testing gas by measuring impedance, admittance, and related quantities.
422, Chemical Apparatus and Process Disinfecting, Deodorizing, Preserving, or Sterilizing, 50 for an apparatus utilizing a chemical reaction to analyze a gas, particularly subclass 89 for gas chromatography.
436, Chemistry: Analytical and Immunological Testing, particularly subclass 68 for a process utilizing a chemical reaction for determining the gases in the blood, and
subclasses 161+ for chromatography.

Baseline drift correction circuitry:
This subclass is indented under subclass 23.22. Subject matter which includes circuitry for correcting a systematic shift in the spectra of the chromatogram.

Rate of flow:
This subclass is indented under subclass 23.22. Subject matter wherein the condition being corrected or adjusted is the rate of flow of the gas being tested or of the carrier gas.

Temperature:
This subclass is indented under subclass 23.22. Subject matter wherein the condition being corrected or adjusted is the temperature of the gas or the chromatography.

SEE OR SEARCH CLASS:
374, Thermal Measuring and Testing, 100 for temperature measurement, per se.

Gradient:
This subclass is indented under subclass 23.25. Subject matter wherein the condition being corrected or adjusted is the temperature variations along the column or columns of the chromatography.

Pressure:
This subclass is indented under subclass 23.22. Subject matter wherein the condition being corrected or adjusted is
the pressure of the gas effluent or of the carrier gas.

For density or specific gravity:
This subclass is indented under subclass 23.21. Subject matter wherein the condition being corrected or adjusted affects the determination of the mass per unit volume of the gas or the ratio of the density of the gas to the density of some substance taken as a standard when both densities are obtained by weighing in air.

Pressure:
This subclass is indented under subclass 23.28. Subject matter wherein the condition being corrected or adjusted is the pressure of the gas being measured or tested, which pressure is used to determine the density or specific gravity of the gas.

Breath analysis:
This subclass is indented under subclass 23.2. Subject matter wherein the gas being tested is exhaled by a human being or other animal.

SEE OR SEARCH CLASS:
128, Surgery, 717 for breath analyzing inside the body.
340, Communications: Electrical, 632 for a humanly perceptible indication of a predetermined condition of the breath.
422, Chemical Apparatus and Process Disinfecting, Deodorizing, Preserving, or Sterilizing, 84 for a breath analyzer utilizing a chemical change to analyze air exhaled from a human being or other animal.
436, Chemistry: Analytical and Immunological Testing, appropriate subclasses for a process of gas analysis which utilizes a chemical reaction, particularly subclass 132 for ethanol determination, and subclass 900 for a cross-reference art collection of breath testing processes.

Gas of combustion:
This subclass is indented under subclass 23.2. Subject matter wherein the gas being tested is the product of a combustion process.

SEE OR SEARCH CLASS:
340, Communications: Electrical, 632 for a humanly perceptible indication of a predetermined condition of a gas of combustion.
422, Chemical Apparatus and Process Disinfecting, Deodorizing, Preserving, or Sterilizing, 94 for a detector, per se, of combustible gas.

Air-fuel ratio:
This subclass is indented under subclass 23.31. Subject matter wherein the ratio of the amount of air to the amount of fuel in the gas of combustion is determined.

SEE OR SEARCH CLASS:
123, Internal-Combustion Engines, 434 and particularly subclasses 672+ for measuring the composition of exhaust gas and utilizing the measurement to control the air-fuel ratio.

Solid content:
This subclass is indented under subclass 23.32. Subject matter wherein the nature or amount of particulate matter in the gas of combustion is determined.

Odor:
This subclass is indented under subclass 23.2. Subject matter wherein stimulation of the olfactory organ of an animal is used to detect or measure the gas.

Gas chromatography:
This subclass is indented under subclass 23.2. Process or apparatus in which the effluent of a mixture of gases, which has contacted a solvent or sorbent which separates the mixture into fractional components, is successively tested to determine the quantity, quality or identity of a component of the effluent.

SEE OR SEARCH THIS CLASS, SUBCLASS:
19.02 for a gas chromatography process or apparatus for determining the presence of, or the amount of, gas in a liquid or a solid.
35.05 for a gas detector, per se, which may be used in gas chromatography.
53.01 for liquid testing (e.g., liquid chromatography).
863 for a sampling device, per se.

SEE OR SEARCH CLASS:
95, Gas Separation: Processes, 82 for processes of gas separation, per se (i.e., not combined with analysis steps), using chromatography.
96, Gas Separation: Apparatus, 101 for apparatus for gas separation, per se (i.e., not combined with analysis means), of the chromatos:graphic type.
204, Chemistry: Electrical and Wave Energy, 400 for electrochemical gas sensors, per se.
210, Liquid Purification or Separation, 660 for a process of removing a constituent from a liquid by sorption, particularly subclasses 656+ for selective sorptions (e.g., chromatography), subclasses 85+ for a liquid separator with recorder or register and subclasses 263+ for a liquid separator utilizing a bed of particulate material.
324, Electricity: Measuring and Testing, particularly 464 for gas analysis using ionization effects, and appropriate subclasses for testing gas by measuring impedance, admittance, and related quantities.
422, Chemical Apparatus and Process Disinfecting, Deodorizing, Preserving, or Sterilizing, 50 for an apparatus utilizing a chemical reaction to analyze a gas, particularly subclass 89 for gas chromatography.
436, Chemistry: Analytical and Immunological Testing, for a process of gas analysis which utilizes a chemical reaction, particularly 161 for chromatography.

With electrical computer or data processor control:
This subclass is indented under subclass 23.35. Subject matter including a programmable electronic device which can store, retrieve and process data, which device controls the chromatography.

With spectrometer:
This subclass is indented under subclass 23.35. Subject matter combined with an instrument used to measure the spectral characteristics of light.

Petrochemical:
This subclass is indented under subclass 23.35. Subject matter in which the gas being tested is a derivative of petroleum.

Column detail:
This subclass is indented under subclass 23.35. Subject matter comprising detail of a tubular structure which is either packed with a material having a known absorption characteristic and/or is coated with a liquid of a high molecular weight and having known properties.

Detector detail:
This subclass is indented under subclass 23.35. Subject matter wherein significance is attributed to the sensing means.

Including sample preparation or sampling:
This subclass is indented under subclass 23.35. Subject matter wherein the sample is treated or modified before being tested, or a predetermined portion of a mass of material is obtained for testing, or a previously obtained sample transported or handled in preparation for analysis, or a previously obtained sample is introduced into an analyzer.
(1) Note. Included here is a liquid sample which is gasified prior to injection into the column.

SEE OR SEARCH THIS CLASS, SUBCLASS:
863 for sample preparation or sampling, per se.

SEE OR SEARCH CLASS:
422, Chemical Apparatus and Process Disinfecting, Deodorizing, Preserving, or Sterilizing, subclass 89 for a sample undergoing a chemical reaction.

Detail of gas handling means:
This subclass is indented under subclass 23.35. Subject matter wherein significance is attributed to the means for confining, directing, or controlling the flow of gaseous material.

By vibration:
This subclass is indented under subclass 23.2. Subject matter in which the composition of a gas or a constituent of a gas is determined by detecting or measuring the transmission of vibration through the gas being tested.

Produced by radiant energy:
This subclass is indented under subclass 24.01. Subject matter wherein the vibration is produced by energy in the form of electromagnetic waves or traveling subatomic, atomic or molecular particles.

Solid content of gas:
This subclass is indented under subclass 24.01. Subject matter wherein the nature or amount of particulate matter in gas is determined.

Moisture content or vapor pressure of gas:
This subclass is indented under subclass 24.01. Subject matter wherein the amount of moisture in the gas being analyzed or the pressure of the vapor in the gas is determined.

Density or specific gravity of gas:
This subclass is indented under subclass 24.01. Subject matter for determining the mass per unit volume of the gas or the ratio of the density of the gas to the density of some substance taken as a standard when both densities are obtained by weighing in air.

Detector detail:
This subclass is indented under subclass 24.01. Subject matter wherein significance is attributed to the means for sensing the vibration.

By thermal property:
This subclass is indented under subclass 23.2. Subject matter in which the composition of a gas or a constituent of a gas is determined by detecting or measuring the heat transmitting or heat related properties of the gas.

SEE OR SEARCH THIS CLASS, SUBCLASS:
29.02 for hygrometers utilizing temperature measuring.

With magnetic property (e.g., paramagnetic gas):
This subclass is indented under subclass 25.01. Subject matter wherein the gas being analyzed produces a modification of the magnetic field of a measuring device.

Thermoconductivity:
This subclass is indented under subclass 25.01. Subject matter wherein the heat transmitting property of a gas is determined.

Moisture content or vapor pressure:
This subclass is indented under subclass 25.01. Subject matter wherein the amount of moisture in the gas or the pressure of the vapor in the gas is measured or detected.

Detector detail:
This subclass is indented under subclass 25.01. Subject matter wherein significance is attributed to the sensing means.

Solid content of gas:
This subclass is indented under subclass 23.2. Subject matter wherein the nature or amount of particulate matter in gas is determined.

SEE OR SEARCH THIS CLASS, SUBCLASS:
31.01 for measuring other impurities in the air.
170.25 for measuring solid particles originating in the outer space surrounding the Earth.
863.21 for sampling involving separation of constituents where no testing device is claimed.

SEE OR SEARCH CLASS:
516, Colloid Systems and Wetting Agents; Subcombinations Thereof; Processes of Making, Stabilizing, Breaking, or Inhibiting, 1 for continuous gas or vapor phase colloid system (e.g., smoke, fog, aersol, cloud, mist) or agents for such systems or making or stabilizing such systems or agents subclass 114 for processes of or compositions for or subcombination compositions for the breaking of or inhibiting of colloid systems of conitinuous gas or vapor phase (e.g., fog dispelling, dust suppressing, contrail suppressing); in each instance, when generically claimed or when there is no hierarchically superior provision in the USPC for the specifically claimed art.

Particle charging:
This subclass is indented under subclass 28.01. Subject matter wherein the determination is made by measuring a parameter related to electrically charged particles (e.g., the total electrical field produced by the particles being charged).

Pressure:
This subclass is indented under subclass 28.01. Subject matter wherein the force per unit area applied over a surface by the gas is measured in order to determine the solid content of the gas.

Separator detail:
This subclass is indented under subclass 28.01. Subject matter wherein significance is attributed to the means separating the solid from the gas.

Impactor:
This subclass is indented under subclass 28.04. Subject matter wherein separation is accomplished by directing a fluid current of gas containing solid particles toward a solid surface wherein the isolated particles remain on the surface.

SEE OR SEARCH THIS CLASS, SUBCLASS:
863.21 for subject matter under the class definition for obtaining a predetermined portion of a mass of material being tested including isolation of individual components of the source or sample.

Fractionalizing:
This subclass is indented under subclass 28.05. Subject matter wherein the particles are distributed on the surface according to size.

SEE OR SEARCH THIS CLASS, SUBCLASS:
863.22 for sampling, per se, including isolation of individual components of a source or sample by directing a fluid current containing particles toward a solid surface wherein the isolated particles remain on the surface.

Moisture content or vapor pressure:
This subclass is indented under subclass 23.2. Subject matter including means for determining the amount of liquid diffused in the gas or the pressure exerted by liquid diffused into the gas.

SEE OR SEARCH THIS CLASS, SUBCLASS:
24.04 for determining the moisture content or vapor pressure of a gas by measuring the transmission of vibration through the gas.
25.04 for determining the moisture content or vapor pressure of a gas by measuring a thermal property of the gas.

This subclass is indented under subclass 29.01. Subject
matter wherein the amount of the liquid is the actual amount of water vapor in a unit volume of air (e.g., the absolute humidity) or the ratio of the amount of water vapor in the air to the amount of water vapor which the air would hold if it were saturated at that temperature (e.g., the relative humidity).

SEE OR SEARCH THIS CLASS, SUBCLASS:
29.01 for other thermal testing of a gas.
73 for humidity determining means combined with additional apparatus for testing or determining the moisture content of a substance.

SEE OR SEARCH CLASS:
200, Electricity: Circuit Makers and Breakers, 61.06 for humidity controlled electric switches.
236, Automatic Temperature and Humidity Regulation, principally subclass 44 for humidity responsive devices combined with regulating means.
324, Electricity: Measuring and Testing, appropriate subclasses for devices wherein the atmosphere or gas changes in electrical conductance, in response to humidity and such property, is taken as a measure of humidity. Where no electrical property of the material under test is measured, but an additional element is exposed to the material to have its electrical properties affected by a physical property of the separate element measured, the art is in Class 73, Measuring and Testing.
338, Electrical Resistors, subclass 35 for electrical resistors whose resistance value is responsive to humidity or changes in humidity.
361, Electricity: Electrical Systems and Devices, subclass 178 for relays controlled by humidity.
374, Thermal Measuring and Testing, subclass 109 for a measuring device providing a composite indication of temperature and humidity and subclass 142 for the combination of a thermometer and another measuring device wherein the thermometer is not a subcombination of a hygrometer. In the latter case when a thermometer is merely claimed as a subcombination of a hygrometer, the device would be classified in this class (73).

Pressure:
This subclass is indented under subclass 29.01. Subject
matter wherein the pressure of the gas is measured to determine the amount of vapor present in the gas.

With visual indication:
This subclass is indented under subclass 29.01. Subject matter wherein the determination is made by directly observing the visible effect of a gas on a sensor.

Detector detail:
This subclass is indented under subclass 29.01. Subject matter wherein significance is attributed to the sensing means.

Density or specific gravity:
This subclass is indented under subclass 23.2. Subject matter including means for determining the mass per unit volume of the gas or the ratio of the density of the gas to the density of some substance taken as a standard when both densities are obtained by weighing in air.

SEE OR SEARCH THIS CLASS, SUBCLASS:
32 for determining the density or specific gravity of a liquid or solid.
152.05 for determining a characteristic of a formation in a borehole by measuring density.

By pressure measurement:
This subclass is indented under subclass 30.01. Subject matter wherein pressure is measured in order to determine density or specific gravity of gas.

By rate of flow:
This subclass is indented under subclass 30.01. Subject matter wherein the density of specific gravity of a gas is determined by measuring the rate of the flow of the gas.

SEE OR SEARCH THIS CLASS, SUBCLASS:
118.2 for the measuring of the air intake of an auxiliary unit of an engine or a motor.
861 for a device determining the volume of flow, speed, volume rate of flow, or mass rate of flow of fluent material.

Detector detail:
This subclass is indented under subclass 30.01. Subject matter wherein significance is attributed to the sensing means.

Ambient air:
This subclass is indented under subclass 23.2. Subject matter wherein the gas being tested is the naturally occurring mixture of gases surrounding the earth.

SEE OR SEARCH THIS CLASS, SUBCLASS:
28.01 for measuring the solid content of air not originating in the outer space surrounding the Earth.

Impurity:
This subclass is indented under subclass 31.01. Subject matter wherein the mixture is being tested for undesirable content.

Impurity:
This subclass is indented under subclass 23.2. Subject
matter wherein the gas is being tested for undesirable content.

Pressure:
This subclass is indented under subclass 23.2. Subject matter wherein the force per unit area exerted by the gas on a surface is measured.

Detector detail:
This subclass is indented under subclass 23.2. Subject matter wherein significance is attributed to the sensing means.

Semiconductor:
This subclass is indented under subclass 31.05. Subject matter wherein the detector includes semiconductor material.

Particular separator:
This subclass is indented under subclass 23.2. Subject matter wherein significance is attributed to the means for isolating a constituent of a gaseous mixture.
(1) Note. This subclass does not include chromatos:graphic separation of gases, per se.

SEE OR SEARCH THIS CLASS, SUBCLASS:
19.02 for chromatos:graphic separation of gases whose content in a solid or a liquid is being measured.
19.12 for a particular separator of a gas from a liquid or a solid.
23.35 for chromatos:graphic separation of gases whose composition or constituent is being detected or measured.
863 for gas sampling, per se.

SEE OR SEARCH CLASS:
95, Gas Separation: Processes, for processes of gas separation, per se (i.e., not combined with analysis steps).
96, Gas Separation: Apparatus, for apparatus for gas separation, per se (i.e., not combined with analysis means).
422, Chemical Apparatus and Process Disinfecting, Deodorizing, Preserving, or Sterilizing, 83 for an apparatus for gas sampling involving the use of sorbents or chemicals wherein a chemical reaction is utilized to analyze the gas.

This subclass is indented under the class definition. Subject matter for determining the density and/or specific gravity of liquids or solids.
(1) Note. Included here is an apparatus for measuring density of a liquid suspension of a solid, per se.

SEE OR SEARCH THIS CLASS, SUBCLASS:
30 for determination of the density or specific gravity of gases.
152.05 for determining a characteristic of a formation in a borehole by measuring density.

SEE OR SEARCH CLASS:
364, Electrical Computers and Data Processing Systems, subclass 558 for measuring the density of a substance which involves a computation and only nominal claimed structure to the measuring device.

ENGINE DETONATION (E.G., KNOCK):
This subclass is indented under the class definition. Subject matter comprising a process or an apparatus for performing a test or measurement by determining or detecting abnormal rapid combustion in an internal combustion engine.

SEE OR SEARCH THIS CLASS, SUBCLASS:
116 for engine or motor testing, per se, including pressure measuring in an engine or a motor.
570 for testing (a) by applying vibration to a body or (b) by sensing vibration, per se.
700 for a fluid pressure gage, per se.
865.6 for testing, per se, in a simulated environment.

SEE OR SEARCH CLASS:
123, Internal-Combustion Engines, subclass 425 for engine knock control of ignition timing and subclass 435 for knock control of a pressure responsive charge forming device.
324, Electricity: Measuring and Testing, 378 for purely electrical testing of an internal combustion engine ignition system or device.
701, Data Processing: Vehicles, Navigation, and Relative Location, subclass 111 for determining engine knock by use of an electrical computer wherein no more than a nominally recited knock sensor is claimed.

Fuel rating (e.g., octane rating):
This subclass is indented under subclass 35.01. Subject matter wherein a measurement of a quality of a test fuel is made by detecting an abnormal rapid combustion (e.g. knock) of the test fuel in the engine and comparing the knock of the test fuel with a knock value of a second fuel having a known fuel rating.

SEE OR SEARCH THIS CLASS, SUBCLASS:
53.01 for liquid analysis, per se.

SEE OR SEARCH CLASS:
123, Internal-Combustion Engines, 575 for diverse fuel supply for an internal-combustion engine.
261, Gas and Liquid Contact Apparatus, subclass 36.2 for fluid distribution means in a carburetor.

Combustion signal compared to reference signal varied by a condition of the engine:
This subclass is indented under subclass 35.01. Subject matter including a combustion signal produced by a sensing
means whose characteristic changes in response to the combustion and which is compared with a reference signal responsive to a condition of the engine to determine detonation.
(1) Note. A reference signal is presumed to be varied by a condition of the engine unless otherwise stated as being fixed.
(2) Note. The reference signal may be derived from the combustion itself as, for example, by integration.

Including calculation means:
This subclass is indented under subclass 35.03. Subject matter comprising an element for performing a mathematical computation utilizing the reference signal.

SEE OR SEARCH CLASS:
701, Data Processing: Vehicles, Navigation, and Relative Location, subclass 111 for application of an electrical computer or data processing to determine a vehicle engine knock wherein computer detail or data processing detail is recited and wherein no more than a nominally recited sensor is claimed.

Automatic gain control or feedback control:
This subclass is indented under subclass 35.03. Subject matter including either (a) an amplifier having a gain controlled by some condition of the engine or (b) a circuit arrangement comprising several stages including an earlier stage and a later stage wherein the later stage produces an output signal which is fed to the earlier stage of the arrangement for control purposes.

Combustion signal compared to a fixed reference signal or utilizing a threshold value:
This subclass is indented under subclass 35.01. Subject matter including a combustion signal produced by a sensing means whose characteristic changes in response to combustion and which is either (a) compared to a predetermined signal or (b) limited to that portion over a predetermined minimum
value.

Specific type of detonation sensor:
This subclass is indented under subclass 35.01. Subject matter comprising a specified sensing means whose characteristic changes in response to detecting detonation and which is intended to produce a signal in response to the change in the characteristic.

SEE OR SEARCH THIS CLASS, SUBCLASS:
866.5 for a probe or a probe mounting, per se.

SEE OR SEARCH CLASS:
204, Chemistry: Electrical and Wave Energy, appropriate subclass for an electrochemical sensor, per se.
250, Radiant Energy, 216 for a photocell, per se.
310, Electrical Generator or Motor Structure, 328 for a condition responsive piezoelectric sensor, per se.
336, Inductor Devices, appropriate subclass for a condition responsive inductive sensor, per se.
338, Electrical Resistors, appropriate subclass for a condition responsive resistor, per se.
359, Optics: Systems (Including Communication) and Elements, appropriate subclass for an optical element, per se.
361, Electricity: Electrical Systems and Devices, appropriate subclass for a condition responsive capacitor, per se.

Ionization:
This subclass is indented under subclass 35.07. Subject matter wherein the sensing means comprises spaced electrodes between which electrical current passes in proportion to ionization of combustion gases in the engine.

SEE OR SEARCH CLASS:
324, Electricity: Measuring and Testing, 459 for an ionization detector, per se.

Vibration:
This subclass is indented under subclass 35.07. Subject matter wherein the sensing means detects a rapid periodic motion of a body about an equilibrium position, which rapid periodic motion of the body is caused by detonation.
(1) Note. An acoustic detector for knock sensing is included here.

SEE OR SEARCH THIS CLASS, SUBCLASS:
570 for other testing by vibration.

Piezoelectric:
This subclass is indented under subclass 35.09. Subject matter wherein the sensing means comprises a pressure responsive material which generates an electric signal in response to vibration.

SEE OR SEARCH CLASS:
310, Electrical Generator or Motor Structure, subclass 329 for a vibration responsive piezoelectric detector, per se.

Pressure:
This subclass is indented under subclass 35.07. Subject matter wherein the sensing means detects a rapid fluctuation in pressure caused by detonation.

SEE OR SEARCH THIS CLASS, SUBCLASS:
115 for measuring pressure in an engine.
700 for a fluid pressure gage, per se.

Piezoelectric:
This subclass is indented under subclass 35.12. Subject matter wherein the sensing means comprises pressure
responsive material which generates an electrical signal in response to the pressure fluctuation.

SEE OR SEARCH CLASS:
310, Electrical Generator or Motor Structure, subclass 338 for a pressure responsive piezoelectric detector, per se.

EXPLOSIVE:
This subclass is indented under the class definition. Subject matter comprising a process or an apparatus for (a) determining a physical characteristic of a body or material by measuring a disruptive force or a disruptive pressure produced by an explosion of the body or material or (b) testing a body or material by applying a disruptive force or a disruptive pressure due to an explosion.

SEE OR SEARCH THIS CLASS, SUBCLASS:
12.01 for testing by impact or shock, per se.
167 for ordnance testing especially by measuring pressure in a gun barrel.
700 for a pressure gage, per se.
865.6 for testing, per se, in a simulated environment.

SEE OR SEARCH CLASS:
102, Ammunition and Explosives, for an explosive, per se.
346, Recorders, subclass 7 for an inertia recorder.

By time measurement (e.g., burning rate, detonation velocity):
This subclass is indented under subclass 35.14. Subject matter wherein the explosion produces a traveling wavefront and the determination of a parameter of the explosion is made by measuring the time required for the wave front in the explosion to proceed from one point to another.

SEE OR SEARCH CLASS:
324, Electricity: Measuring and Testing, 160 for electrical speed determining by measuring time between the occurrence of electrical pulses.
368, Horology: Time Measuring Systems or Devices, for a time measuring system and device and especially, 89 for an interval timer, per se.

Electric sensor:
This subclass is indented under subclass 35.14. Subject matter comprising a sensing means for producing an electrical signal response to a disruptive force or a disruptive pressure.

SEE OR SEARCH THIS CLASS, SUBCLASS:
866.5 for a probe or a probe mounting, per se.

SEE OR SEARCH CLASS:
250, Radiant Energy for a photocell, per se.
310, Electrical Generator or Motor Structure, 311 for a condition responsive piezoelectric sensor, per se.
336, Inductor Devices, appropriate subclasses for a condition responsive inductive sensor, per se.
338, Electrical Resistors, 13 for a condition responsive resistor, per se.
356, Optics: Measuring and Testing, appropriate subclass for condition responsive devices measuring visible light.
359, Optics: Systems (Including Communication) and Elements, appropriate subclass for an optical element, per se.
361, Electricity: Electrical Systems and Devices, 280 for a condition responsive capacitor, per se.

Safety feature or containment structure:
This subclass is indented under subclass 35.14. Subject matter including means for either (a) protecting a person from the effects of the explosive during testing or (b) restricting effects of the explosion to a predetermined space during testing.

SEE OR SEARCH THIS CLASS, SUBCLASS:
571 for a test chamber for vibration testing, per se.
865.6 for a test chamber, per se.

SEE OR SEARCH CLASS:
102, Ammunition and Explosives, subclass 331 for a blasting charge case, per se.
109, Safes, Bank Protection or a Related Device, appropriate subclasses for a safety structure, per se.
220, Receptacles, appropriate subclass for container structure, per se, and in particular 88.1 for a fire preventing attachment for a receptacle, per se.

This subclass is indented under the class definition. Subject matter for testing illuminating fluids to determine flash point, vapor pressure and end point.

SEE OR SEARCH THIS CLASS, SUBCLASS:
35.02 for measuring engine knock or detonation.
35.14 for testing of an explosive.

SEE OR SEARCH CLASS:
374, Thermal Measuring and Testing, subclass 8 for flammability testing, and subclasses 16+ for transformation point determination, in general.

This subclass is indented under the class definition. Subject matter for subjecting a specimen directly to fluid pressure (positive or negative) to determine properties of the specimen.

SEE OR SEARCH THIS CLASS, SUBCLASS:
1.16 for proving or calibrating volume or rate of flow meters and elements thereof.
1.57 for proving or calibrating pressure responsive devices and gauges.
12.01 for testing by impact or shock where the impact or
shock is transmitted by a fluid.
807 and 838+, for the use of fluids to determine the bursting strength of sheet material.

SEE OR SEARCH CLASS:
138, Pipes and Tubular Conduits, subclass 90 for test plug closures for conduits.
141, Fluent Material Handling, With Receiver or Receiver Coacting Means, for processes and apparatus for filling of receivers with gases, liquids, or fluent solids, or for evacuating receivers, particularly 4 and 65+ for gas filling or evacuating.
445, Electric Lamp or Space Discharge Component or Device Manufacturing, for processes and apparatus for gas filling and/or evacuation of lamp and discharge device envelopes in connection with other manufacture or repair operations.
700, Data Processing: Generic Control Systems or Specific Applications, subclass 301 for pressure control.

This subclass is indented under subclass 37. Subject matter for checking dimensions, shape or size of an object, or the spacing of selected portions thereof, having at least one unit for the direct application of fluid pressure thereto and utilizing the escape of fluid about the specimen as an index of its dimension, shape, size or spacing.

SEE OR SEARCH CLASS:
33, Geometrical Instruments, 556 and 700+ for processes and apparatus for determining size or dimension by means of a mechanical contact or feeler which in turn influences the fluid flow, pressure or volume of indicating means.

This subclass is indented under subclass 37.5. Subject matter in which the object is in motion during the test.

This subclass is indented under subclass 37.6. Subject matter in which the object under test is a sheet, cable or filament.

SEE OR SEARCH THIS CLASS, SUBCLASS:
159 and see the search notes thereto, for other sheet or filament tests.

SEE OR SEARCH CLASS:
226, Advancing Material of Indeterminate Length, 10 for fluid actuated material detectors for control of means which advance material of indefinite length and subclass 22 for pneumatic detectors to sense the lateral position of material.

This subclass is indented under subclass 37.5. Subject matter for making measurements of each of two correlated objects or two portions of the same object.

This subclass is indented under subclass 37.5. Subject matter for measurement of size of bores and similar concave openings in specimens.

This subclass is indented under subclass 37. Subject matter for determining through the direct application of fluid under pressure the porosity (i.e., volume of interstices) of solids, the fineness of powdered materials, or action of filters; also, the determining of permeability (i.e., the passage or diffusibility of fluids through a specimen).

SEE OR SEARCH THIS CLASS, SUBCLASS:
152.05 for determining a characteristic of a formation in a borehole by measuring permeability or porosity.

This subclass is indented under subclass 37. Subject matter, for the testing of the operating or control mechanism of fluid pressure operated brakes (e.g., air or hydraulic types for motor vehicles, trains, etc.).

SEE OR SEARCH THIS CLASS, SUBCLASS:
7 for testing the wear surfaces of brakes by abrasion, milling, rubbing or scuffing.
121 for other types of brake testing.
862.09 particularly subclasses 862.09+ for dynamo-meters having brakes.

SEE OR SEARCH CLASS:
188, Brakes, particularly subclass 141 and 151+ for fluid pressure types.
303, Fluid-Pressure and Analogous Brake Systems.

This subclass is indented under subclass 37. Subject matter for testing or determining leakage of a specimen or body.
(1) Note. The combination of means for testing specimens with means to reject those specimens which fail to pass the test is in Class 209, Classifying, Separating, and Assorting Solids, subclasses 509+ except where the test is a leakage test.

SEE OR SEARCH CLASS:
48, Gas: Heating and Illuminating, 193 for detecting and preventing leakage from gas mains.
137, Fluid Handling, subclass 15.11 for a process of detecting or repairing a leak of a pipe, joint, valve, or tank.
138, Pipes and Tubular Conduits, subclass 90 for closure plugs useful in connection with leakage tests of pipes.
209, Classifying, Separating, and Assorting Solids, see Note 1.
374, Thermal Measuring and Testing, 4, for leakage testing by measuring thermal parameters.

This subclass is indented under subclass 40. Subject matter for testing fluid operative systems or fluid handling conduits while in their operative assembly or position.

SEE OR SEARCH CLASS:
48, Gas: Heating and Illuminating, subclass 193, for means associated with a gas main to detect or indicate leaks without positive means to create a condition whereby leakage is produced in a defective pipe or joint; and subclass 195 for the preparation of odorous material and/or the insertion thereof into a gas main.
166, Wells, subclass 179 and the subclasses here noted for packer or plug devices in wells which are inherently capable of use as fluid pressure leakage testers.

This subclass is indented under subclass 40. Subject matter wherein a probe gas, smoke, vapor or powder is applied to a specimen and its escape or penetration is detected.

This subclass is indented under subclass 40. Subject matter wherein the article under test (usually a can or other receptacle) is moved by a conveyor during or through the test operation.

This subclass is indented under subclass 41. Subject matter including immersing the article in a liquid.

This subclass is indented under subclass 41.2. Subject matter including means for segregating or discarding a defective article (e.g., the operator presses a button to reject a defective specimen).

This subclass is indented under subclass 41.3. Subject matter automatically responsive to a defective condition of the article.

This subclass is indented under subclass 41. Subject matter including means for segregating or discarding a defective article.

SEE OR SEARCH THIS CLASS, SUBCLASS:
41.3 for similar structure combined with immersion testing.

This subclass is indented under subclass 45. Subject matter responsive to a defective condition of the article.

SEE OR SEARCH THIS CLASS, SUBCLASS:
41.4 for similar structure combined with immersion testing.

This subclass is indented under subclass 45.1. Subject matter controlled or operated by electric or electromagnetic means.

This subclass is indented under subclass 45.1. Subject matter wherein the article is sustained against a test head by vacuum unless leakage of the article destroys the vacuum and permits the article to fall by gravity.

This subclass is indented under subclass 45.1. Subject matter relating to presealed containers.

This subclass is indented under subclass 40. Subject matter including immersing the specimen in a liquid.

SEE OR SEARCH THIS CLASS, SUBCLASS:
41.2 for immersion test with conveyor means for moving the specimen through the liquid.

This subclass is indented under subclass 45.5. Subject matter for testing a pneumatic inner tube, casing, or tubeless tire.

This subclass is indented under subclass 45.6. Subject matter relating to mesh structure for inclosing the tire to prevent it from bursting under pressure.

This subclass is indented under subclass 45.5. Subject matter relating to a radiator.

This subclass is indented under subclass 40. Subject matter for testing or determining leakage between parts mechanically fitted together and capable of being separated without destruction (e.g., faucets, separable pipe joints having interfitted parts, etc.).

SEE OR SEARCH THIS CLASS, SUBCLASS:
37 and 40, for fluid pressure testing of rivets, welded seams, etc., for various purposes including leakage.

SEE OR SEARCH CLASS:
277, Seal for a Joint or Juncture, for a generic sealing means or process, subclass 320 for a seal combined with means to indicate fluid leakage.

This subclass is indented under subclass 46. Subject matter for leakage testing of engine heads, i.e., any one or any combination of valve, piston or piston ring.

SEE OR SEARCH THIS CLASS, SUBCLASS:
119 for miscellaneous tests of engine parts.

This subclass is indented under subclass 46. Subject matter for leakage testing of tire valves.

This subclass is indented under subclass 40. Subject matter for testing of pneumatic tubeless tires, inner tubes or casings.

SEE OR SEARCH THIS CLASS, SUBCLASS:
45.6 for testing such articles by immersion.

This subclass is indented under subclass 40. Subject matter for testing for leakage of a pipe section.

SEE OR SEARCH THIS CLASS, SUBCLASS:
46 for similar testing of a separable joint.
49.5 for strength testing of pipe.

This subclass is indented under subclass 40. Subject matter for testing a receptacle.

This subclass is indented under subclass 49.2. Subject matter the receptacle being a presealed container.

SEE OR SEARCH THIS CLASS, SUBCLASS:
45.4 for testing for leakage of a sealed receptacle on a conveyor and with automatic discard means.
52 for other testing of a sealed receptacle.

This subclass is indented under subclass 37. Subject matter
wherein a test liquid pressure is induced by a single stroke ram or plunger.

This subclass is indented under subclass 37. Subject matter for testing pipe.

SEE OR SEARCH THIS CLASS, SUBCLASS:
49.1 for testing for leakage of a pipe section.

This subclass is indented under subclass 49.5. Subject matter including power operated means for closing or sealing the pipe ends.

This subclass is indented under subclass 37. Subject matter for testing of a motor auxiliary or part.

SEE OR SEARCH THIS CLASS, SUBCLASS:
118 for other testing of auxiliary units.
119 for other testing of motor parts.

This subclass is indented under subclass 37. Subject matter relating to a clamp, plug or other sealing feature.

SEE OR SEARCH THIS CLASS, SUBCLASS:
49.6 for power operated means for sealing ends of a pipe under test.

SEE OR SEARCH CLASS:
138, Pipes and Tubular Conduits, subclass 90 for a test plug closure for a conduit.

This subclass is indented under the class definition. Subject matter for testing of sealed receptacles (usually cans). Test is usually for spoilage of contents, presence of foreign matter therein, etc.

SEE OR SEARCH THIS CLASS, SUBCLASS:
37 particularly subclasses 45.4 and 49.3, for testing of sealed receptacles with extraneously applied fluid pressure.
824 for testing of sealed receptacles by rotating squeezing elements.

LIQUID ANALYSIS OR ANALYSIS OF THE SUSPENSION OF SOLIDS IN A LIQUID:
This subclass is indented under the class definition. Subject matter comprising a process or an apparatus for detecting or determining the composition of, a constituent of, or a property of a liquid or a liquid suspension of a solid.
(1) Note. Determining is considered to include measuring.

SEE OR SEARCH THIS CLASS, SUBCLASS:
10 for testing the effect of a lubricant on frictional resistance or coefficient.
32 for determining the specific gravity or the density of a liquid or a liquid suspension of a solid wherein the density measuring is not used to further determine some other property of the liquid or the liquid suspension.
35.02 for measuring engine knock or detonation in order to determine a fuel rating.
152.42 for determining a characteristic of a borehole, a casing, or a drill rigging by analyzing a fluid.
169 for determining the physical characteristic of dough.
170.17 for a rain gauge.
290 for a liquid level gauge.
592 for liquid leakage or liquid location detection by using vibration.
700 for a fluid pressure gauge.
861 for measuring the volume or the rate of flow of a liquid.

SEE OR SEARCH CLASS:
128, Surgery, 630 for testing liquids wherein the test is conducted within a living body.
204, Chemistry: Electrical and Wave Energy, appropriate subclasses for electrolytic sensor, per se.
250, Radiant Energy, appropriate subclasses for using invisible light to test liquids and, in particular, 301 for methods of determining oil presence, contamination, or concentration using radiant energy; subclasses 306+ for inspection of liquids by charged particles, subclasses 336.1+ for invisible radiant energy signalling of conditions of liquids and subclasses 573+ for optical or pre-optical systems having a liquid in the path there of wherein the modification of or the emission of radiant energy resulting from the irradiation of the liquid is tested.
340, Communications: Electrical, 603 for a humanly perceptible indication of a predetermined condition of a liquid.
356, Optics: Measuring and Testing, appropriate subclass for determining a property of a liquid by measuring visible light.
422, Chemical Apparatus and Process Disinfecting, Deodorizing, Preserving, or Sterilizing, appropriate subclass for an apparatus for testing a liquid wherein a chemical reaction is involved.
516, Colloid Systems and Wetting Agents; Subcombinations Thereof; Processes of Making, Stabilizing, Breaking, or Inhibiting, appropriate subclasses for colloid systems or agents for such systems or making or stabilizing such systems or agents, 113 for compositions for or subcombination compositions for or breaking of or inhibiting of colloid systems (e.g., foam breaking, emulsion breaking, dispersion inhibiting, suspension settling, gel breaking, smoke suppressing, coagulating, flocculating), in each instance, when generically claimed or when there is no hierarchically superior provision in the USPC for the specifically claimed art.

Butter fat content:
This subclass is indented under subclass 53.01. Subject matter wherein the constituent is butter fat.

Paper or wood suspension (e.g., paper or wood pulp):
This subclass is indented under subclass 53.01. Subject matter wherein the determination is made by measuring either the degree to which paper pulp or wood pulp relinquishes its water content or the percentage of water content relinquished.

SEE OR SEARCH THIS CLASS, SUBCLASS:
29.02 for determining the moisture content of a gas.
73 for determining the moisture content of solid or the absorptive characteristic of material for a liquid.

SEE OR SEARCH CLASS:
162, Paper Making and Fiber Liberation, subclass 258 for a device for regulating the ratio of liquid to fiber of pulp and subclass 263 for the combination of means for testing or permitting the examination of water in liquid laid fibrous product and a structure or mechanism for producing and/or treating water or liquid laid fibrous products.

By measuring fluid flow characteristic (e.g., by volume or rate of flow or by change in fluid level):
This subclass is indented under subclass 53.03. Subject matter wherein the determination is made by measuring a parameter which is characteristic of the liquid being in motion.

SEE OR SEARCH THIS CLASS, SUBCLASS:
1.16 for proving or calibrating volume of flow, speed of flow, volume rate, or flow or mass rate of flow.
1.73 for proving or calibrating a liquid level or volume measuring apparatus.
54.13 for determining viscosity by measuring a time interval of travel or flow rate using an orifice, nozzle, or extrusion
means wherein there is disclosed detail of a means whose optical character changes due to a change in a physical phenomenon associated with the liquid whose viscosity is being measured.
54.19 for detail of a timing means in a device wherein viscosity is determined by gravity movement of an object in a liquid.
61.64 for determining settling or filtering ability by measuring volumetric or flow or sedimentation rate.
61.73 for utilizing flow effect to measure settling or filtering ability.
152.21 for determining a characteristic of a borehole, a casing, or a drill rigging by measuring a flow of a fluid during drilling.
170.11 for determining the direction and rate of flow of a fluid in meteorology and oceanology.
178 for the speed of a craft with respect to a fluid.
861 for measuring the volume or the rate of flow of liquid, per se.

SEE OR SEARCH CLASS:
116, Signals and Indicators, appropriate subclass for nonelectrical means for giving an alarm upon the occurrence of a predetermined condition of a fluid.
128, Surgery, 668 for measuring blood flow in the body wherein there is disclosed structure for placement in a living body.
137, Fluid Handling, 98 for a self-proportioning flow system and subclasses 624.11+ for a programmed or timed valve which meters fluid merely by timing the interval between opening and closing of the valve.
175, Boring or Penetrating the Earth, appropriate subclass for measuring the rate of flow of drilling fluid combined with a device of that class type.
222, Dispensing, particularly subclass 14, 59, and 71 for volume or rate of flow-measuring means having dispensing features or which are used in dispensing combinations.
250, Radiant Energy, particularly subclass 258, 259+, 356.1, and 432 for miscellaneous radiant energy responsive devices.
324, Electricity: Measuring and Testing, subclass 306 for flow-measuring means responsive to nuclear induction.
340, Communications: Electrical, 606 for electrical means
for giving a humanly perceptible indication or signal in response to a predetermined condition, such as the flow of fluid.
356, Optics: Measuring and Testing, 27 for flow measuring means employing a laser.
368, Horology: Time Measuring Systems or Devices, 89, for time interval measuring, per se.
377, Electrical Pulse Counters, Pulse Dividers, or Shift Registers: Circuits and Systems, subclass 21 for a system utilizing a pulse counter to measure fluid flow.
700, Data Processing: Generic Control Systems or Specific Applications, subclasses 282-285 for flow control.

Lubricant testing:
This subclass is indented under subclass 53.01. Subject matter wherein the determination is made by measuring the capability of a substance to reduce friction, heat, and wear when it is introduced as a film between two relatively movable solid surfaces.

SEE OR SEARCH THIS CLASS, SUBCLASS:
10 for an apparatus or a process for determining the effect of a lubricant upon the frictional drag between two relatively movable solid surfaces.

SEE OR SEARCH CLASS:
250, Radiant Energy, subclass 301 for an apparatus or method for utilizing invisible radiant energy in testing for the presence of, the concentration of or contamination in oil.
356, Optics: Measuring and Testing, subclass 70 for determining the contamination of oil by measuring a characteristic of electromagnetic wave energy in the visible range.

By analyzing a characteristic of a measuring surface:
This subclass is indented under subclass 53.05. Subject matter wherein determination is made by analyzing or observing the effect of the lubricant upon a surface.

SEE OR SEARCH THIS CLASS, SUBCLASS:
104 for surface inspection or testing, per se.

By solid content:
This subclass is indented under subclass 53.05. Subject matter wherein the determination is made by measuring an amount of particulate matter in the liquid.

Viscosity:
This subclass is indented under subclass 53.01. Subject wherein the determination is of the resistance of the liquid to change in shape or a force within the liquid that opposes motion therein (e.g. flow, usually by internal force reaction or energy absorption).

SEE OR SEARCH THIS CLASS, SUBCLASS:
822 for viscosity measurement in a solid by compressional testing.
843 for viscosity measurement in a solid by shear testing using a rotary element.
862.08 for torque measurement, per se.
862.38 for force measurement, per se.

Combined with other measuring means:
This subclass is indented under subclass 54.01. Subject matter including another type of measuring process or apparatus.

Of concrete (e.g., slump indicator):
This subclass is indented under subclass 54.01. Subject matter wherein the liquid is a mixture of cement, sand and gravel.

Friction tube (e.g., capillary):
This subclass is indented under subclass 54.01. Subject matter wherein the determination is made by using a small slender tubular conduit wherein the surface of the liquid in contact with the conduit forms an elevation or a depression due to either the molecular attraction of the molecules of the liquid to each other or the attraction of the molecules of the liquid to the molecules of the surface of the tube.

Plural tubes:
This subclass is indented under subclass 54.04. Subject matter including more than one conduit.

By pressure measuring:
This subclass is indented under subclass 54.05. Subject matter wherein the determination includes measuring the force, per unit area, of the fluid moving through the conduit.

SEE OR SEARCH THIS CLASS, SUBCLASS:
54.14 for determining viscosity by measuring pressure of the liquid flowing through an orifice, nozzle, or extrusion means.
61.47 for measuring pressure in order to determine the liquid constituent of a liquid mixture.
61.73 for measuring pressure of a liquid in order to determine its solid content.
61.78 for measuring pressure to determine the content or effect of a constituent of a liquid mixture.
64.46 for measuring differential pressure to determine vapor pressure.
64.51 for measuring pressure to determine surface tension.
700 for liquid pressure measurement, per se.

By time interval of travel or flow rate measuring:
This subclass is indented under subclass 54.04. Subject matter wherein the determination is made by measuring the volume of or the mass rate of flow of the liquid or the time elapsed for the liquid to move a predetermined distance.

SEE OR SEARCH THIS CLASS, SUBCLASS:
1.16 for proving or calibrating volume of flow, speed of flow, volume rate, or flow or mass rate of flow.
53.04 for utilizing flow characteristics to measure a property of a paper or pulp suspension.
54.13 for determining viscosity by measuring a time interval of travel or flow rate using an orifice, nozzle, or extrusion means wherein there is disclosed detail of a means whose optical character changes due to a change in a physical phenomenon associated with the liquid whose viscosity is being measured.
54.19 for detail of a timing means in a device wherein viscosity is determined by gravity movement of an object in a liquid.
61.64 for the utilization of flow properties in order to determine settling or filtering ability.
61.73 for utilization of flow characteristic to measure the solid content of a liquid suspension.
152.29 for determining a characteristic of a borehole, a casing, or a drill rigging by measuring a rate of flow of a fluid, per se.
170.11 for determining the direction and rate of flow of a fluid in meteorology and oceanology.
178 for the speed of a craft with respect to a fluid.
861 for measuring the volume or the rate of flow of liquid, per se.

SEE OR SEARCH CLASS:
116, Signals and Indicators, appropriate subclass, for nonelectrical means for giving an alarm upon the occurrence of a predetermined condition of a fluid.
128, Surgery, 668 for measuring blood flow in the body wherein there is disclosed structure for placement in a living body.
137, Fluid Handling, 98 for a self-proportioning flow system and subclasses 624.11+ for a programmed or timed valve which meters fluid merely by timing the interval between opening and closing of the valve.
175, Boring or Penetrating the Earth, appropriate subclass for measuring the rate of flow of drilling fluid combined with a device of that class type.
222, Dispensing, particularly subclass 14, 59, and 71 for volume of rate of flow-measuring means having dispensing features or which are used in dispensing combinations.
324, Electricity: Measuring and Testing, subclass 306 for flow-measuring means responsive to nuclear induction.
340, Communications: Electrical, 606 for electrical means for giving a humanly perceptible indication or signal in response to a predetermined condition, such as the flow of fluid.
356, Optics: Measuring and Testing, appropriate subclasses for flow measuring devices of the optical type including no manipulation other than that necessary for an optical test.
368, Horology: Time Measuring Systems or Devices, 89, for time interval measuring, per se.
377, Electrical Pulse Counters, Pulse Dividers, or Shift Registers: Circuits and Systems, subclass 21 for a system utilizing a pulse counter to measure fluid flow.
700, Data Processing: Generic Control Systems or Specific Applications, subclass 281 for control of fluid level or volume, subclasses 282-285 for flow control.

Including a photocell:
This subclass is indented under subclass 54.07. Subject matter including means having an electrical characteristic which changes in response to light.

SEE OR SEARCH THIS CLASS, SUBCLASS:
54.13 for determining viscosity by measuring a time interval of travel or flow rate using an orifice, nozzle, or extrusion means wherein there is disclosed detail of a means whose optical character changes due to a change in a physical phenomenon associated with the liquid whose viscosity is being measured.
866.5 for a sensor, per se.

SEE OR SEARCH CLASS:
250, Radiant Energy, 200 for photocell detectors, per se.

By pressure measuring:
This subclass is indented under subclass 54.04. Subject matter wherein the determination is made by measuring the force per unit area of the liquid moving through the conduit.

SEE OR SEARCH THIS CLASS, SUBCLASS:
54.06 for measuring viscosity by pressure difference measuring using plural friction tubes.
54.14 for determining viscosity by measuring pressure of the liquid flowing through an orifice, nozzle, or extrusion means.
61.47 for measuring pressure in order to determine the liquid constituent of a liquid mixture.
61.73 for measuring pressure of a liquid in order to determine its solid content.
61.78 for measuring pressure to determine the content or effect of a constituent of a liquid mixture.
64.46 for measuring differential pressure to determine vapor pressure.
64.51 for measuring pressure to determine surface tension.
700 for liquid pressure measurement, per se.

Orifice, nozzle, or extrusion means:
This subclass is indented under subclass 54.01. Subject matter wherein the determination is made by utilizing the reaction of the liquid to flowing through an orifice, a nozzle, or an extrusion means.

Plural fluids (e. g., comparison):
This subclass is indented under subclass 54.11. Subject matter wherein the determination is made by measuring reactions of plural liquids.

By time interval of travel or flow rate measuring:
This subclass is indented under subclass 54.11. Subject matter wherein the determination is made by measuring the volume or the mass rate of flow or the time elapsed for the liquid to move a predetermined distance.

SEE OR SEARCH THIS CLASS, SUBCLASS:
1.16 for proving or calibrating volume of flow, speed of flow, volume rate, or flow or mass rate of flow.
53.04 for utilizing flow characteristics to measure a property of a paper or pulp suspension.
54.07 for time interval of travel or rate of flow measuring using friction tubes to determine viscosity.
54.19 for detail of a timing means in a device wherein viscosity is determined by gravity movement of an object in a liquid.
61.64 for the utilization of flow properties in order to determine settling or filtering ability.
61.73 for utilization of flow characteristic to measure the solid content of a liquid suspension.
152.21 for determining a characteristic of a borehole, a casing, or a drill rigging by measuring a rate of flow of a fluid during drilling.
152.29 for determining a characteristic of a borehole, a casing, or a drill rigging by measuring a rate of flow of a fluid, per se.
170.11 for the determining the direction and rate of flow of a fluid in meteorology and oceanology.
178 for the speed of a craft with respect to a fluid.
861 for measuring the volume or the rate of flow of liquid, per se.

SEE OR SEARCH CLASS:
116, Signals and Indicators, appropriate subclass, for nonelectrical means for giving an alarm upon the occurrence of a predetermined condition of a fluid.
128, Surgery, 668 for measuring blood flow in the body wherein there is disclosed structure for placement in the living body.
137, Fluid Handling, 98 for a self-proportioning flow system and subclasses 624.11+ for a programmed or timed valve which meters fluid merely by timing the interval between opening and closing of the valve.
175, Boring or Penetrating the Earth, appropriate subclass for a device for measuring the rate of flow of drilling fluid in combination with an art device of that class type.
222, Dispensing, particularly subclass 14, 59, and 71 for volume of or rate of flow-measuring means having dispensing features or which are used in dispensing combinations.
324, Electricity: Measuring and Testing, subclass 306 for flow-measuring means responsive to nuclear induction.
340, Communications: Electrical, 606 for electrical means for giving a humanly perceptible indication or signal in response to a predetermined condition, such as the flow of fluid.
356, Optics: Measuring and Testing, appropriate subclass for an optical measuring of fluid flow utilizing visible light but having no other manipulation recited other than that for use in an optical measurement of that class.
368, Horology: Time Measuring Systems or Devices, 89 for time interval measuring, per se.
377, Electrical Pulse Counters, Pulse Dividers, or Shift Registers: Circuits and Systems, subclass 21 for a system utilizing a pulse counter to measure fluid flow.
700, Data Processing: Generic Control Systems or Specific Applications, subclass 281 for control of fluid level or volume, subclasses 282-285 for flow control.

By force, pressure, or displacement measuring:
This subclass is indented under subclass 54.11. Subject matter wherein the determination is made by measuring either the force, pressure, or displacement force used to move or extrude the liquid or the pressure of the liquid.

SEE OR SEARCH THIS CLASS, SUBCLASS:
61.47 for measuring pressure in order to determine the liquid constituent of a liquid mixture.
61.73 for measuring pressure of a liquid in order to determine its solid content.
61.78 for measuring pressure to determine the content or effect of a constituent of a liquid mixture.
64.46 for measuring differential pressure to determine vapor pressure.
64.51 for measuring pressure to determine surface tension.
700 for liquid pressure measurement, per se.
862.08 for torque measuring, per se.
862.38 for measuring force, per se.

Gravity movement of an object in a liquid ( e. g., a bubble):
This subclass is indented under subclass 54.01. Subject matter wherein the determination is made by measuring rate at which an object rises (usually a bubble) or sinks in the liquid.

With detail of temperature or pressure regulating or compensating means:
This subclass is indented under subclass 54.15. Subject matter wherein significance is attributed to means for controlling, regulating, or compensating for a thermal effect or pressure on the liquid.

Using a reference fluid:
This subclass is indented under subclass 54.15. Subject matter wherein the determination is made by comparing the time of flight of an object through the liquid being tested with the time of flight of same or a second identical object through a liquid of a known standard viscosity.

With means for restoring an object to its initial starting position (e.g., magnetic or fluid means):
This subclass is indented under subclass 54.15. Subject matter including means for returning the object to its original position after the completion of each test.

Including detail of a timing detection circuit:
This subclass is indented under subclass 54.15. Subject matter wherein significance is attributed to an electrical circuit for detecting the time of flight of the object in the liquid.

SEE OR SEARCH THIS CLASS, SUBCLASS:
54.13 for determining viscosity by measuring a time interval of travel or flow rate using an orifice, nozzle, or extrusion means wherein there is disclosed detail of a means whose optical character changes due to a change in a physical phenomenon associated with the liquid whose viscosity is being measured.

SEE OR SEARCH CLASS:
368, Horology: Time Measuring Systems or Devices, 89 for time interval measuring, per se.

Including an object concentricity guide means:
This subclass is indented under subclass 54.15. Subject matter including means for maintaining a constant gap between the container for the liquid and the falling object.

Adhesion between wetted surfaces:
This subclass is indented under subclass 54.01. Subject matter wherein the determination is made by measuring the molecular attraction of the liquid to closely adjacent wetted surfaces between which it is located.

Force reactance to member driven therein:
This subclass is indented under subclass 54.01. Subject matter wherein the determination is made by measuring the force reaction of the liquid to a member (e.g., a disc, an impeller, a resonator, etc.) driven therein.

SEE OR SEARCH THIS CLASS, SUBCLASS:
54.31 for measuring the driving force of a rotationally driven member in order to determine viscosity.
64.49 for determining the surface tension by measuring force.
862.08 for torque measuring, per se.
862.38 for force measuring, per se.

By vibration:
Subject matter under 54.23 wherein the determination is made by subjecting the member to mechanical vibration.

SEE OR SEARCH THIS CLASS, SUBCLASS:
19.03 for measuring the gas content of a liquid by measuring the effect of the liquid on vibration.
24.01 for utilization of vibration to analyze gas.
40.05 for acoustic detection of liquid leakage utilizing pressurized fluid.
54.41 for utilizing vibration to test the viscosity of a liquid.
61.45 for determining a multiphase liquid constituent of a liquid mixture measuring vibration.
61.49 for utilizing vibration to determine the liquid constituent of a liquid mixture.
61.75 for measuring the solid components of a liquid utilizing vibration.
61.79 for utilizing vibration to determine the effect of the content of a liquid.
64.42 for testing of a gelling or coagulation property of a liquid utilizing vibration.
64.53 for testing a liquid or a liquid suspension of a solid by utilizing vibration.
592 for detecting liquid leakage and location by utilizing vibration.

Dampening effect (e.g., frequency, amplitude, speed, or power measurement):
This subclass is indented under subclass 54.24. Subject matter wherein the determination is made by measuring a power, force, or current required to maintain a predetermined vibrational frequency or amplitude or change in frequency or amplitude of a vibrator driven by a constant force.

With detail of a drive means or a detecting means:
This subclass is indented under subclass 54.25. Subject matter wherein significance is attributed to a circuitry or other means used to vibrate the member or to the means which measure the vibrational effect of the member.

With detail (e. g., circuitry) of a drive means or a detecting means:
This subclass is indented under subclass 54.24. Subject matter wherein significance is attributed to a circuitry or other means used to vibrate the member or to the means which measure the vibrational effect of the member.

Rotationally driven member:
This subclass is indented under subclass 54.23. Subject matter wherein the member is subjected to rotational motion of more than 360 degrees.
(1) Note. Oscillations of less than 360 degrees are considered vibrations.

Comparator:
This subclass is indented under subclass 54.28. Subject matter wherein the determination is made by comparing measurements of a member rotating in a first liquid with the same or an identical member rotating in a second liquid.

By measuring the driving force or the speed of the driven member:
This subclass is indented under subclass 54.28. Subject matter wherein the determination is made by measuring the drive current or voltage for maintaining the member rotating at a constant speed or by measuring a speed of the driven member when driven by a constant force.

By measuring an opposed drag force:
This subclass is indented under subclass 54.28. Subject matter wherein the determination is made by measuring a force exerted on a secondary member due to a viscous drag force.

By measuring angular displacement:
This subclass is indented under subclass 54.32. Subject matter wherein the determination is made by measuring the amount of movement imparted to the secondary member due to movement of the rotationally driven member.

By measuring a counterbalance or restoring force:
This subclass is indented under subclass 54.32. Subject matter wherein the determination is made by measuring the force is which is necessary to maintain stationary a secondary member which is displaced by a viscous drag force caused by the rotation of the driven member.

Including detail of a motor drive, a stator, or a housing structure of a motor:
This subclass is indented under subclass 54.28. Subject matter wherein significance is attributed to either a means for converting energy to a form which results in the movement of the driven member, a stationary part of such means or an enclosure for such means.

SEE OR SEARCH CLASS:
310, Electrical Generator or Motor Structure, appropriate subclass for electric motor structure or housing, per se.
318, Electricity: Motive Power Systems, appropriate subclass for a drive circuit for a motor or motor control, per se.

Penetrometer:
This subclass is indented under subclass 54.23. Subject matter wherein the determination is made by measuring the depth of or the rate of penetration of a member driven into the liquid with a predetermined force or by measuring a characteristic of the predetermined force on a member driven therein.

By movement or displacement between shearing surfaces:
This subclass is indented under subclass 54.23. Subject matter wherein the determination is made by measuring the relative movement between adjacent or parallel surfaces when subjected to a predetermined force for a predetermined time.

Detector detail:
This subclass is indented under subclass 54.23. Subject matter wherein significance is attributed to a sensing means.

SEE OR SEARCH THIS CLASS, SUBCLASS:
862 for a force responsive sensors or a torque responsive sensor.
866.5 for a sensing means, per se.

Shearing torque between parallel surfaces:
This subclass is indented under subclass 54.01. Subject matter wherein the determination is made by measuring the force which is necessary to shear a film of liquid disposed between closely adjacent relatively slidable surfaces.

SEE OR SEARCH THIS CLASS, SUBCLASS:
54.24 for similar subject matter wherein a reaction force is measured.

Vibration:
This subclass is indented under subclass 54.01. Subject matter wherein the determination is made by measuring the effect of the liquid or the suspension being tested on vibration.

SEE OR SEARCH THIS CLASS, SUBCLASS:
19.03 for measuring the gas content of a liquid by measuring the effect of the liquid on vibration.
24.01 for utilization of vibration to analyze gas.
40.05 for acoustic detection of liquid leakage utilizing pressurized fluid.
54.24 for determining viscosity of a liquid by measuring the force reactance to a member vibrated therein.
61.45 for determining a multiphase liquid constituent of a liquid mixture measuring vibration.
61.49 for utilizing vibration to determine the liquid constituent of a liquid mixture.
61.75 for measuring the solid components of a liquid utilizing vibration.
61.79 for utilizing vibration to determine the effect of the content of a liquid.
64.42 for testing of a gelling or coagulation property of a liquid utilizing vibration.
64.53 for testing a liquid or a liquid suspension of a solid by utilizing vibration.
592 for detecting liquid leakage and location by utilizing vibration.

Thermal:
This subclass is indented under subclass 54.01. Subject matter wherein the determination is made by measuring a heat or a temperature related property.

SEE OR SEARCH THIS CLASS, SUBCLASS:
61.46 and 61.76+, for determining content or the effect of the constituent of a liquid mixture by means of a thermal measurement.

SEE OR SEARCH CLASS:
374, Thermal Measuring and Testing, subclass 43 for determining the inherent thermal properties, per se, of a liquid, subclass 54 for thermal measurement of liquid volume and subclass 139 for measuring the temperature of a liquid metal.

With detail of a pressure or a temperature regulating means:
This subclass is indented under subclass 54.01. Subject matter wherein significance is attributed to a means for controlling temperature or pressure within the apparatus for analyzing the liquid or the liquid suspension.

Cleaning or foaming ability:
This subclass is indented under subclass 53.01. Subject matter wherein the determination is made by measuring either the ability of the liquid or the liquid suspension to remove undesirable matter from a surface or the ability of liquid or the liquid suspension to foam bubbles.

SEE OR SEARCH CLASS:
516, Colloid Systems and Wetting Agents; Subcombinations
Thereof; Processes of Making, Stabilizing, Breaking, or Inhibiting, appropriate subclasses for colloid systems or agents for such systems or making or stabilizing such systems or agents, 113 for compositions for or subcombination compositions for or breaking of or inhibiting of colloid systems (e.g., foam breaking, emulsion breaking, dispersion inhibiting, suspension settling, gel breaking, smoke suppressing, coagulating, flocculating), in each instance, when generically claimed or when there is no hierarchically superior provision in the USPC for the specifically claimed art.

Content or effect of a constituent of a liquid mixture:
This subclass is indented under subclass 53.01. Subject matter wherein the determination is made by detecting or measuring the amount of or the presence of a constituent of a liquid mixture, the ratio of one constituent to at least another constituent, or the effect of a constituent of a liquid mixture.

SEE OR SEARCH THIS CLASS, SUBCLASS:
23.2 for similar processes and apparatus for gas analysis, particularly subclasses 23.35+ for gas chromatography and subclasses 28.01+ for determining the solid content of a gas.
64.41 for tests of gelling or coagulation even though this effect may be disclosed as being caused by the presence of some constituent.
863.21 for samplers, per se, which isolate particulate matter from a liquid for latter analysis or inspection.

SEE OR SEARCH CLASS:
62, Refrigeration, subclass 58 and 123+ for processes and apparatus, per se, for fractionally solidifying by freezing and separation.
210, Liquid Purification or Separation, appropriate subclasses, for the separation of a solid from a liquid.

Metallic particle constituent:
This subclass is indented under subclass 61.41. Subject matter wherein the determination being made is of a liquid containing metallic particles.

SEE OR SEARCH CLASS:
324, Electricity: Measuring and Testing, subclass 204 for determining magnetic properties of a liquid or a liquid mixture.

Liquid constituent of a liquid mixture:
This subclass is indented under subclass 61.41. Subject matter wherein the determination is made by measuring or detecting the amount, ratio, presence, or effect of one or more constituents of a mixture of liquids.

Plural liquid constituent (e.g., multiphase liquid):
This subclass is indented under subclass 61.43. Subject matter wherein the determination is made by measuring or detecting the amount, ratio, presence, or effect of plural liquid constituents of a liquid mixture.

SEE OR SEARCH CLASS:
516, Colloid Systems and Wetting Agents; Subcombinations Thereof; Processes of Making, Stabilizing, Breaking, or Inhibiting, appropriate subclasses for colloid systems or agents for such systems or making or stabilizing such systems or agents, 113 for compositions for or subcombination compositions for or breaking of or inhibiting of colloid systems (e.g., foam breaking, emulsion breaking, dispersion inhibiting, suspension settling, gel breaking, smoke suppressing, coagulating, flocculating), in each instance, when generically claimed or when there is no hierarchically superior provision in the USPC for the specifically claimed art.

By vibration:
This subclass is indented under subclass 61.44. Subject matter wherein the determination is made by detecting or measuring the effect of the liquid on vibration.

SEE OR SEARCH THIS CLASS, SUBCLASS:
19.03 for measuring the gas content of a liquid by measuring
the effect of the liquid on vibration.
24.01 for utilization of vibration to analyze gas.
40.05 for acoustic detection of liquid leakage utilizing pressurized fluid.
54.24 for determining viscosity of a liquid by measuring the force reactance to a member vibrated therein.
54.41 for utilizing vibration to test the viscosity of a liquid.
61.49 for utilizing vibration to determine the liquid constituent of a liquid mixture.
61.75 for measuring the solid components of a liquid utilizing vibration.
61.79 for utilizing vibration to determine the effect of the content of a liquid.
64.42 for testing of a gelling or coagulation property of a liquid utilizing vibration.
64.53 for testing a liquid or a liquid suspension of a solid by utilizing vibration.
592 for detecting liquid leakage and location by utilizing vibration.

SEE OR SEARCH CLASS:
516, Colloid Systems and Wetting Agents; Subcombinations Thereof; Processes of Making, Stabilizing, Breaking, or Inhibiting, appropriate subclasses for colloid systems or agents for such systems or making or stabilizing such systems or agents, 113 for compositions for or subcombination compositions for or breaking of or inhibiting of colloid systems (e.g., foam breaking, emulsion breaking, dispersion inhibiting, suspension settling, gel breaking, smoke suppressing, coagulating, flocculating), in each instance, when generically claimed or when there is no hierarchically superior provision in the USPC for the specifically claimed art.

By thermal measurement:
This subclass is indented under subclass 61.43. Subject matter wherein the determination is made by measuring a heat or a temperature related property.

SEE OR SEARCH THIS CLASS, SUBCLASS:
54.42 for a thermal measurement of the viscosity of a liquid.

SEE OR SEARCH CLASS:
374, Thermal Measuring and Testing, appropriate subclass for thermal measuring and testing, per se, or temperature measuring, per se.

By pressure measurement:
This subclass is indented under subclass 61.43. Subject matter wherein the determination is made by measuring the force per unit area of the liquid or the liquid mixture.

SEE OR SEARCH THIS CLASS, SUBCLASS:
54.14 for determining viscosity of a liquid flowing through an orifice, nozzle, or extrusion means by measuring pressure.
61.73 for measuring pressure in order to determine the solid content of a liquid mixture.
61.78 for measuring pressure to determine the content or effect of a constituent of a liquid mixture.
64.46 for measuring differential pressure to determine vapor pressure.
64.51 for measuring pressure to determine surface tension.
700 for liquid pressure measurement, per se.

By optical irradiation:
This subclass is indented under subclass 61.43. Subject matter wherein the determination is made by measuring the effect of the sediment on visible light.

SEE OR SEARCH CLASS:
250, Radiant Energy, appropriate subclasses for a photocell, per se, and for analyzing a liquid utilizing invisible light which is modified by transmission through or emission by the liquid being tested wherein the modified light is tested.
356, Optics: Measuring and Testing, appropriate subclass for
an optical measuring of fluid using visible light and involving no manipulation other than that necessary to perform the optical test.

By vibration:
This subclass is indented under subclass 61.43. Subject matter wherein the determination is made by measuring of detecting the effect of the liquid on vibration.

SEE OR SEARCH THIS CLASS, SUBCLASS:
19.03 for measuring the gas content of a liquid by measuring the effect of the liquid on vibration.
40.05 for acoustic detection of liquid leakage utilizing pressurized fluid.
54.24 for determining the viscosity of a liquid by measuring the force reactance of the liquid to the member vibrated therein.
54.41 for utilizing vibration to test the viscosity of a liquid.
61.45 for determining a multiphase liquid constituent of a liquid mixture by utilizing vibration.
61.75 for utilizing vibration to measure the solid content of a liquid mixture.
61.79 for utilizing vibration to measure the content or the effect of a constituent of a liquid mixture.
64.42 for utilization of vibration for detecting gelling or coagulation characteristics of a liquid.
64.49 for determining surface tension by utilizing vibration.
64.53 for testing a liquid or a liquid suspension of a solid by utilizing vibration.
592 for utilizing vibration to test for liquid leakage or a pipe flaw.

Buoyant detector:
This subclass is indented under subclass 61.43. Subject
matter wherein the detector floats on the surface of the liquid.

Chromatography:
This subclass is indented under subclass 61.43. Subject matter wherein the determination is made by successively testing the effluence of a mixture of liquids, which has contacted a solvent or sorbent which separates the mixture into fractional components in order to determine the quantity, quality or identity of a component of the effluent.

SEE OR SEARCH THIS CLASS, SUBCLASS:
19.1 for a gas chromatos:graphic process or apparatus for determining the presence of or the amount of gas in a liquid.
23.35 for the analysis of gas by chromatography.
863 for liquid sampling, per se.

SEE OR SEARCH CLASS:
204, Chemistry: Electrical and Wave Energy, 400 for electrolytic analysis and testing apparatus.
205, Electrolysis: Processes, Compositions Used Therein, and Methods of Preparing the Compositions, 775 for electrolytic analysis or testing processes.
210, Liquid Purification or Separation, 85 for a liquid separator with a recorder, subclass 198.2 for a device for removing a constituent from a liquid by sorption combined with means to add treating material, subclasses 263+ for a liquid separator utilizing a bed of particulate material and subclasses 660+ for a process of removing a constituent from a liquid by sorption.
324, Electricity: Measuring and Testing, particularly 459 for liquid analysis using ionization effects and appropriate subclasses for testing a liquid by measuring an electrical property of the liquid.
356, Optics: Measuring and Testing, 409 for a process of liquid chromatography wherein a liquid substance, a solute in a solvent, or a miscible liquid is examined by transmission of light to furnish a quantitative or qualitative determination with respect to a chemical composition of the liquid analyzed in the absence of a color development.
422, Chemical Apparatus and Process Disinfecting,
Deodorizing, Preserving, or Sterilizing, subclass 70 for chromatos:graphic analysis of a liquid utilizing a chemical reaction.
436, Chemistry: Analytical and Immunological Testing, subclass 161 for a process or composition in which the results of a chemical reaction is subjected to a chromatos:graphic separation or analysis.

Column detail:
This subclass is indented under subclass 61.52. Subject matter wherein significance is attributed to a tubular structure which is either packed with a material having a known absorption characteristic or is coated with a liquid of a high molecular weight and having known properties.

SEE OR SEARCH THIS CLASS, SUBCLASS:
23.39 for column detail of gas chromatography in gas analysis.

Paper or thin layer type:
This subclass is indented under subclass 61.52. Subject matter wherein the sorbent is a paper or other thin layer material.

SEE OR SEARCH CLASS:
210, Liquid Purification or Separation, subclass 198.3 for liquid separation using the layer chromatography.
436, Chemistry: Analytical and Immunological Testing, subclass subclass 162 for subject of that class type utilizing paper or thin layer plate chromatography.

Including sampling, sample handling, or sample preparation:
This subclass is indented under subclass 61.52. Subject matter combined with means for obtaining a predetermined amount of a liquid to be tested, for treating a liquid sample in preparation for its analysis or for isolating individual components of a liquid prior to analysis thereof.
(1) Note. "Sampling" includes: (a) Transporting or handling previously obtained samples of liquid in preparation for analysis. or (b) Introducing previously obtained liquid samples in preparation for analysis. or (c) The preparation of a liquid sample prior to the analysis thereof.

SEE OR SEARCH THIS CLASS, SUBCLASS:
23.41 for a chromatos:graphic gas analyzer including sample preparation or sampling.
23.42 for a chromatos:graphic gas analysis including detail of gas handling.
61.59 for a liquid analyzer using chromatography and including detail of sampling, sample handling or sample preparation.
155 for the measurement of liquid flow characteristics in a well bore utilizing sampling.
170.29 for the measurement of an oceanos:graphic phenomena combined with sampling the ocean.
863 for liquid sampling, per se.

SEE OR SEARCH CLASS:
4, Baths, Closets, Sinks, and Spittoons, appropriate subclass for a urine sampler combined with toilet or means to attach the sampler to the toilet.
23, Chemistry: Physical Processes, for a sampling process wherein a step of causing or promoting a chemical reaction, or regulating or controlling a chemical reaction are claimed.
128, Surgery, appropriate subclasses for body fluid samplers having means to contact the human body.
141, Fluent Material Handling, With Receiver or Receiver Coacting Means, appropriate subclass, in particularly 21, 29+, 110, and 130 for a device or method of filling a receiver which is not part of a sampling system.
159, Concentrating Evaporators, subclass 30 for a combination of a concentrating vessel with means for withdrawing a quantity of liquid for examination.
166, Wells, in particularly 107, 142+, 162+, and 264 for an apparatus or method for sampling well fluids.
210, Liquid Purification or Separation, 513 for gravitational separators and especially subclasses 514+ for milk and cream separators.
222, Dispensing, appropriate subclass for subject of that
class type which may include an apparatus or process for obtaining a predetermined portion of material from a mass but not for testing purposes.
250, Radiant Energy, subclass 288 for mass spectrometers with sample supply.
356, Optics: Measuring and Testing, 36 for subject matter of that class type including sample preparation and subclasses 244+ for sample holders.
374, Thermal Measuring and Testing, subclass 140 for a molten metal lance which may include a sample chamber and subclass 157 a thermometer combined with a sample cup.
417, Pumps, appropriate subclass for sampling pumps, per se.
422, Chemical Apparatus and Process Disinfecting, Deodorizing, Preserving, or Sterilizing, for a sampler wherein means for causing, promoting, regulating, or controlling a chemical reaction is claimed.
435, Chemistry: Molecular Biology and Microbiology, 309.1 for inoculators, streakers, or samplers adapted for use with microorganisms and enzymes; and subclass 288.6 for a microorganism or enzyme measuring and testing apparatus, including a column separation means.
604, Surgery, subclass 181 for syringes.

Detail of fluid handling means (e.g., valve, control, etc.):
This subclass is indented under subclass 61.52. Subject matter wherein significance is attributed to the means for confining, directing, or controlling the flow of liquid material.

SEE OR SEARCH CLASS:
141, Fluent Material Handling, With Receiver or Receiver Coacting Means, appropriate subclass, in particularly 21, 29+, 110, and 130 for a device or method of filling a receiver which is not part of a sampling system.
159, Concentrating Evaporators, subclass 30 for a combination of a concentrating vessel with means for withdrawing a quantity of liquid for examination.
210, Liquid Purification or Separation, 513 for gravitational separators and especially subclasses 514+ for milk and cream separators.
222, Dispensing, appropriate subclass for subject of that
class type which may include an apparatus or process for obtaining a predetermined portion of material from a mass but not for testing purposes.

With detail of compensation or regulating means:
This subclass is indented under subclass 61.52. Subject matter wherein significance is attributed to means for controlling a condition within the apparatus or making a correction in a test result due to such condition.

Detector detail:
This subclass is indented under subclass 61.52. Subject matter wherein significance is attributed to a sensing means.

SEE OR SEARCH THIS CLASS, SUBCLASS:
61.61 for a sensing means for detecting liquid constituents of a liquid mixture, per se.
866.5 for a sensing means, per se

With detail of sampling, sample handling, or sample preparation:
This subclass is indented under subclass 61.43. Subject matter combined with sampling means wherein significance is attributed to means for obtaining a predetermined amount of a liquid to be tested, for treating a liquid sample in preparation for its analysis or for isolating individual components of a liquid prior to analysis thereof.
(1) Note. "Sampling" includes: (a) Transporting or handling previously obtained samples of liquid in preparation for analysis. or (b) Introducing previously obtained liquid samples in preparation for analysis. or (c) The preparation of a liquid sample prior to the analysis thereof.

SEE OR SEARCH THIS CLASS, SUBCLASS:
152.23 for determining a characteristic of a borehole, a casing, or a drill rigging by measuring a flow of a fluid, utilizing sampling.
170.29 for the measurement of an oceanos:graphic phenomena combined with sampling the ocean.
863 for liquid sampling, liquid sample handling, or liquid sample preparation, per se.

SEE OR SEARCH CLASS:
4, Baths, Closets, Sinks, and Spittoons, appropriate subclasses for a urine sampler, combined with toilet or means to attach the sampler to the toilet.
23, Chemistry: Physical Processes, appropriate subclasses for a sampling process wherein a step of causing or promoting a chemical reaction, or regulating or controlling a chemical reaction are claimed.
128, Surgery, 185 for body fluid samplers having means to contact the human body.
141, Fluent Material Handling, With Receiver or Receiver Coacting Means, appropriate subclass, in particularly 21, 29+, 110, and 130 for a device or method of filling a receiver which is not part of a sampling system.
159, Concentrating Evaporators, subclass 30 for a combination of a concentrating vessel with means for withdrawing a quantity of liquid for examination.
166, Wells, in particularly 107, 142+, 162+, and 264 for an apparatus or method for sampling well fluids.
210, Liquid Purification or Separation, 513 for gravitational separators and especially subclasses 514+ for milk and cream separators.
222, Dispensing, appropriate subclass for subject of that class type which may include an apparatus or process for obtaining a predetermined portion of material from a mass but not for testing purposes.
250, Radiant Energy, subclass 288 for mass spectrometers with sample supply.
356, Optics: Measuring and Testing, 36 for subject matter of that class type including sample preparation and subclasses 244+ for sample holders.
374, Thermal Measuring and Testing, subclass 140 for a molten metal lance which may include a sample chamber and subclass 157 a thermometer combined with a sample cup.
417, Pumps, for sampling pumps, per se.
422, Chemical Apparatus and Process Disinfecting, Deodorizing, Preserving, or Sterilizing, appropriate subclass
for a sampler wherein means for causing, promoting, regulating or controlling a chemical reaction is claimed.
435, Chemistry: Molecular Biology and Microbiology, 309.1 for inoculators, streakers, or samplers adapted for use with microorganisms and enzymes.
604, Surgery, subclass 181 for syringes.

Detector detail:
This subclass is indented under subclass 61.52. Subject matter wherein significance is attributed to a sensing means.

SEE OR SEARCH THIS CLASS, SUBCLASS:
61.58 for a sensing means for chromatos:graphic determination of content or the effect of a constituent of a liquid mixture.
866.5 for a sensing means, per se.

Depositing characteristic:
This subclass is indented under subclass 61.41. Subject matter wherein the determination is made by measuring the ability of the constituent of a liquid to form a deposit or a coating on a surface (e.g., slime or seal).

SEE OR SEARCH THIS CLASS, SUBCLASS:
86 for tests for treating a nonliquid specimen to determine the effect of a liquid on brittleness or erosion resistance.

SEE OR SEARCH CLASS:
252, Compositions, 175 for scale inhibiting compositions.
422, Chemical Apparatus and Process Disinfecting, Deodorizing, Preserving, or Sterilizing, subclass 53 for corrosion testing apparatus.
510, Cleaning Compositions for Solid Surfaces, Auxiliary Compositions Therefor, or Processes of Preparing the Compositions, for cleaning compositions, including detergents, for solid surfaces and 245 for scale removing compositions.

Settling or filtering ability:
This subclass is indented under subclass 61.41. Subject matter wherein the determination is made by detecting or measuring a characteristic associated with the tendency of the sediment to settle at the bottom of the liquid or a characteristic associated with resistance offered by the mixture when passing through material.

SEE OR SEARCH CLASS:
516, Colloid Systems and Wetting Agents; Subcombinations Thereof; Processes of Making, Stabilizing, Breaking, or Inhibiting, appropriate subclasses for colloid systems or agents for such systems or making or stabilizing such systems or agents, 113 for compositions for or subcombination compositions for or breaking of or inhibiting of colloid systems (e.g., foam breaking, emulsion breaking, dispersion inhibiting, suspension settling, gel breaking, smoke suppressing, coagulating, flocculating), in each instance, when generically claimed or when there is no hierarchically superior provision in the USPC for the specifically claimed art.

By volume or flow rate:
This subclass is indented under subclass 61.63. Subject matter wherein the determination is made by measuring the volume of flow, the speed, the volume rate of flow or mass rate of flow of the liquid mixture.

SEE OR SEARCH THIS CLASS, SUBCLASS:
1.16 for proving or calibrating volume of flow, speed of flow, volume rate, or flow or mass rate of flow.
1.73 for proving or calibrating a liquid level or volume measuring apparatus.
53.04 for a property of a paper or wood suspension by measuring flow characteristic.
54.13 for determining viscosity by measuring a time interval of travel or flow rate using an orifice, nozzle, or extrusion means wherein there is disclosed detail of a means whose optical character changes due to a change in a physical phenomenon associated with the liquid whose viscosity is being measured.
54.19 for detail of a timing means in a device wherein viscosity is determined by gravity movement of an object in a liquid.
61.73 for utilizing flow effect to measure solid components of a liquid suspension.
152.18 for determining a characteristic of a borehole, a casing, or a drill rigging by measuring a flow of a fluid or by analyzing a fluid.
170.11 for determining the direction and rate of flow of a fluid in meteorology and oceanology.
178 for determining the speed of a craft with respect to a fluid.
861 for measuring the volume or the rate of flow of liquid, per se.

SEE OR SEARCH CLASS:
116, Signals and Indicators, appropriate subclasses, for nonelectrical means for giving an alarm upon the occurrence of a predetermined condition of a fluid.
128, Surgery, 668 for measuring blood flow in the body wherein there is disclosed structure for placement in the living body.
137, Fluid Handling, 98 for a self-proportioning flow system and subclasses 624.11+ for a programmed or timed valve which meters fluid merely by timing the interval between opening and closing of the valve.
175, Boring or Penetrating the Earth, appropriate subclasses for measuring the rate of flow of drilling fluid combined with a device of that class.
222, Dispensing, particularly subclass 14, 59, and 71 for volume or rate of flow-measuring means having dispensing features or which are used in dispensing combinations.
250, Radiant Energy, particularly subclass 258, 259+, 356.1, and 432 for miscellaneous radiant energy responsive devices.
324, Electricity: Measuring and Testing, subclass 306 for flow-measuring means responsive to nuclear induction.
340, Communications: Electrical, 606 for electrical means for giving a humanly perceptible indication or signal in response to a predetermined condition, such as the flow of fluid.
356, Optics: Measuring and Testing, appropriate subclass for an optical measuring of fluid flow not involving nonoptical measuring or testing beyond that found in Class 356.
364, Electrical Computers and Data Processing Systems, subclass 510 for an application of computers or data processing in fluid flow studying.
368, Horology: Time Measuring Systems or Devices, 89 for time interval measuring, per se.
377, Electrical Pulse Counters, Pulse Dividers, or Shift Registers: Circuits and Systems, subclass 21 for a system utilizing a pulse counter to measure fluid flow.

Sedimentation rate:
This subclass is indented under subclass 61.63. Subject matter wherein the determination is made by measuring the rate at which the sediment settles to the bottom of the liquid.

With means for accelerating solids (e.g., particles):
This subclass is indented under subclass 61.65. Subject matter including means for imparting an increase in the rate at which the sediment settles.

SEE OR SEARCH CLASS:
516, Colloid Systems and Wetting Agents; Subcombinations Thereof; Processes of Making, Stabilizing, Breaking, or Inhibiting, appropriate subclasses for colloid systems or agents for such systems or making or stabilizing such systems or agents, 113 for compositions for or subcombination compositions for or breaking of or inhibiting of colloid systems (e.g., foam breaking, emulsion breaking, dispersion inhibiting, suspension settling, gel breaking, smoke suppressing, coagulating, flocculating), in each instance, when generically claimed or when there is no hierarchically superior provision in the USPC for the specifically claimed art.

By pressure measurement:
This subclass is indented under subclass 61.65. Subject matter wherein the determination is made by measuring pressure.

SEE OR SEARCH THIS CLASS, SUBCLASS:
54.14 for determining viscosity of a liquid flowing through an orifice, nozzle, or extrusion means by measuring pressure.
61.47 for measuring pressure in order to determine the liquid constituent of a liquid mixture.
61.73 for measuring pressure of a liquid in order to determine its solid content.
61.78 for measuring pressure to determine the content or effect of a constituent of a liquid mixture.
64.46 for measuring differential pressure to determine vapor pressure.
64.51 for measuring pressure to determine surface tension.
700 for liquid pressure measurement, per se.

Including detail of fluid handling means, sampling, sample handling, or sample preparation:
This subclass is indented under subclass 61.65. Subject matter combined with sampling means wherein significance is attributed to means for obtaining a predetermined amount of a liquid to be tested, for treating a liquid sample in preparation for its analysis or for isolating individual components of a liquid prior to analysis thereof and/or to means for confining, directing, or controlling the flow of liquid material.
(1) Note. "Sampling" includes: (a) Transporting or handling previously obtained samples of liquid in preparation for analysis; or (b) introducing previously obtained liquid samples in preparation for analysis; or (c) the preparation of a liquid sample prior to the analysis thereof.

SEE OR SEARCH THIS CLASS, SUBCLASS:
23.41 for a chromatos:graphic gas analyzer including sample preparation or sampling.
23.42 for a chromatos:graphic gas analysis including detail of gas handling.
61.59 for a liquid analyzer using chromatography and including detail of sampling, sample handling, or sample preparation.
152.18 for determining a characteristic of a borehole, a casing, or a drill rigging by measuring a flow of a fluid, utilizing sampling.
170.29 for the measurement of an oceanos:graphic phenomena combined with sampling the ocean.
863 for sampling, per se.

SEE OR SEARCH CLASS:
4, Baths, Closets, Sinks, and Spittoons, appropriate subclass for a urine sampler, combined with toilet or means to attach the sampler to the toilet.
23, Chemistry: Physical Processes, for a sampling process wherein a step of causing or promoting a chemical reaction, or regulating or controlling a chemical reaction are claimed.
128, Surgery, 185 for body fluid samplers having means to contact the human body.
137, Fluid Handling, for valves, per se.
141, Fluent Material Handling, With Receiver or Receiver Coacting Means, appropriate subclasses, in particularly 21, 29+, 110, and 130 for a device or method of filling a receiver which is not part of a sampling system.
159, Concentrating Evaporators, subclass 30 for a combination of a concentrating vessel with means for withdrawing a quantity of liquid for examination.
166, Wells, in particularly 107, 142+, 162+, and 264 for an apparatus or method for sampling well fluids.
210, Liquid Purification or Separation, 513 for gravitational separators and especially subclasses 514+ for milk and cream separators.
222, Dispensing, appropriate subclasses for subject of that class type which may include an apparatus or process for obtaining a predetermined portion of material from a mass but not for testing purposes.
250, Radiant Energy, subclass 288 for mass spectrometers with sample supply.
356, Optics: Measuring and Testing, 36 for subject matter of that class type including sample preparation and subclasses 244+ for sample holders.
374, Thermal Measuring and Testing, subclass 140 for a molten metal lance which may include a sample chamber and subclass 157 a thermometer combined with a sample cup.
417, Pumps, appropriate subclasses for sampling pumps, per se.
422, Chemical Apparatus and Process Disinfecting, Deodorizing, Preserving, or Sterilizing, appropriate subclasses for a sampler wherein means for causing, promoting, regulating or controlling a chemical reaction is claimed.
435, Chemistry: Molecular Biology and Microbiology, 309.1 for inoculators, streakers, or samplers adapted for use with microorganisms and enzymes.
604, Surgery, subclass 181 for syringes.

By optical measurement:
This subclass is indented under subclass 61.65. Subject matter wherein the determination is made by measuring the effect of the sediment on light.

SEE OR SEARCH CLASS:
250, Radiant Energy, appropriate subclasses for a photocell, per se, and for analyzing a liquid utilizing invisible light which is modified by transmission through or emission by the liquid being tested wherein the modified light is tested.
356, Optics: Measuring and Testing, subclass 436 for measuring visible light transmission or absorption of a liquid wherein the test involves no manipulation other than that involved in optical testing.

For measuring solid components (e.g., particles):
This subclass is indented under subclass 61.41. Subject matter wherein the determination is made by measuring or detecting the identity of, the amount of or the effect of a solid constituent of the liquid mixture.

SEE OR SEARCH THIS CLASS, SUBCLASS:
865.5 for measuring particle size, per se.

SEE OR SEARCH CLASS:
356, Optics: Measuring and Testing, 335 for determining particle size by measuring scattered visible light and subclass 544 for measuring visible light transmission to
inspect or to study a suspension of particles in a liquid.
516, Colloid Systems and Wetting Agents; Subcombinations Thereof; Processes of Making, Stabilizing, Breaking, or Inhibiting, appropriate subclasses for colloid systems or agents for such systems or making or stabilizing such systems or agents, 113 for compositions for or subcombination compositions for or breaking of or inhibiting of colloid systems (e.g., foam breaking, emulsion breaking, dispersion inhibiting, suspension settling, gel breaking, smoke suppressing, coagulating, flocculating), in each instance, when generically claimed or when there is no hierarchically superior provision in the USPC for the specifically claimed art.

By separation and subsequent measurement (e.g., by weighing, X-ray or microscope, etc.):
This subclass is indented under subclass 61.71. Subject matter including means for isolating the solid from the liquid and wherein the determination is made subsequent to the isolation.

SEE OR SEARCH CLASS:
210, Liquid Purification or Separation, appropriate subclass, for the separation of liquid components, per se.
516, Colloid Systems and Wetting Agents; Subcombinations Thereof; Processes of Making, Stabilizing, Breaking, or Inhibiting, appropriate subclasses for colloid systems or agents for such systems or making or stabilizing such systems or agents, 113 for compositions for or subcombination compositions for or breaking of or inhibiting of colloid systems (e.g., foam breaking, emulsion breaking, dispersion inhibiting, suspension settling, gel breaking, smoke suppressing, coagulating, flocculating), in each instance, when generically claimed or when there is no hierarchically superior provision in the USPC for the specifically claimed art.

By flowing through barrier or restriction and measuring flow effect (e.g., pressure, volume of or rate of flow):
This subclass is indented under subclass 61.71. Subject matter wherein the isolation is made by means of an element located in a flow path of the liquid and the determination is made by measuring the effect of the movement of the liquid.

SEE OR SEARCH THIS CLASS, SUBCLASS:
1.16 for proving or calibrating volume of flow, speed of flow, volume rate, or flow or mass rate of flow.
53.04 for determining paper and wood suspension properties by measuring flow characteristic.
54.13 for determining viscosity by measuring a time interval of travel or flow rate using an orifice, nozzle, or extrusion means wherein there is disclosed detail of a means whose optical character changes due a change in a physical phenomenon associated with the liquid whose viscosity is being measured.
54.19 for detail of a timing means in a device wherein viscosity is determined by gravity movement of an object in a liquid.
61.64 for determining settling or filtering ability by measuring volume or flow rate of the liquid or the liquid mixture.
152.18 for determining a characteristic of a borehole, a casing, or a drill rigging by measuring a flow of a fluid or by analyzing a fluid.
170.11 for the determining the direction and rate of flow of a fluid in meteorology and oceanology.
178 for the speed of a craft with respect to a fluid.
861 for measuring the volume or the rate of flow of liquid, per se.

SEE OR SEARCH CLASS:
116, Signals and Indicators, appropriate subclass, for nonelectrical means for giving an alarm upon the occurrence of a predetermined condition of a fluid.
128, Surgery, 668 for measuring blood flow in the body wherein there is disclosed structure for placement in a living body.
137, Fluid Handling, 98 for a self-proportioning flow system and subclasses 624.11+ for a programmed or timed valve which meters fluid merely by timing the interval between opening and closing of the valve.
175, Boring or Penetrating the Earth, for measuring the rate of flow of drilling fluid combined with a device of that class type.
222, Dispensing, particularly subclass 14, 59, and 71 for volume of rate of flow-measuring means having dispensing features or which are used in dispensing combinations.
250, Radiant Energy, particularly subclass 258, 259+, 320+, 356.1, and 432 for miscellaneous radiant energy responsive devices.
324, Electricity: Measuring and Testing, subclass 306 for flow-measuring means responsive to nuclear induction.
340, Communications: Electrical, 606 for electrical means for giving a humanly perceptible indication or signal in response to a predetermined condition, such as the flow of fluid.
356, Optics: Measuring and Testing, appropriate subclass for an optical measuring of liquid flow not involving nonoptical measuring or testing.
368, Horology: Time Measuring Systems or Devices, 89, for time interval measuring, per se.
377, Electrical Pulse Counters, Pulse Dividers, or Shift Registers: Circuits and Systems, subclass 21 for a system utilizing a pulse counter to measure fluid flow.
700, Data Processing: Generic Control Systems or Specific Applications, subclass 281 for control of fluid level or volume, and subclasses 282-285 for flow control.

Thermal:
This subclass is indented under subclass 61.73. Subject matter wherein the determination is made by measuring a heat or a temperature related property.

SEE OR SEARCH THIS CLASS, SUBCLASS:
54.42 for determining viscosity by making thermal measurement.
61.46 and 61.76+, for a thermal measurement of content or the effect of the constituent of a liquid mixture.

SEE OR SEARCH CLASS:
374, Thermal Measuring and Testing, subclass 43 for determining the inherent thermal properties, per se, of a liquid, subclass 54 for thermal measurement of liquid volume and subclass 139 for measuring the temperature of a liquid metal.

Vibration:
This subclass is indented under subclass 61.71. Subject matter wherein the determination is made by measuring the effect of the suspension being tested on vibration.

SEE OR SEARCH THIS CLASS, SUBCLASS:
19.03 for measuring the gas content of a liquid by measuring the effect of the liquid on vibration.
24.01 for utilization of vibration to analyze gas.
40.05 for acoustic detection of liquid leakage utilizing pressurized fluid.
54.24 for determining viscosity of a liquid by measuring the force reactance to a member vibrated therein.
54.41 for determining viscosity by utilizing vibration.
61.45 for determining a multiphase liquid constituent of a liquid mixture measuring vibration.
61.49 for utilizing vibration to determine the liquid constituent of a liquid mixture.
61.79 for utilizing vibration to determine the effect of the content of a liquid.
64.42 for testing of a gelling or coagulation property of a liquid utilizing vibration.
592 for detecting liquid leakage and location by utilizing vibration.

By thermal measurement:
This subclass is indented under subclass 61.41. Subject matter wherein the determination is made by measuring a heat or temperature related property.

SEE OR SEARCH THIS CLASS, SUBCLASS:
54.42 for determining viscosity by measuring heat transmitting or heat related properties.
61.46 and 61.74, for the thermal measurement of the liquid content of a liquid mixture.

SEE OR SEARCH CLASS:
374, Thermal Measuring and Testing, subclass 54 for thermal measurement of a liquid volume and subclass 139 for measuring the temperature of molten metal.

Vaporization (e.g., evaporation, distillation, etc.):
This subclass is indented under subclass 61.76. Subject matter wherein the property being tested is the rate at which a liquid turns into a vapor or the heat required to change a liquid into a vapor.

SEE OR SEARCH THIS CLASS, SUBCLASS:
36 for an end point test of hydrocarbons.
61.46 and 61.74, for thermal measuring of the liquid content of a liquid mixture.

SEE OR SEARCH CLASS:
374, Thermal Measuring and Testing, 16 for a test to determine a thermal characteristic of a specimen or the temperature at which the specimen changes its physical state.

By pressure measurement:
This subclass is indented under subclass 61.41. Subject matter wherein the determination is made by measuring force per unit area.

SEE OR SEARCH THIS CLASS, SUBCLASS:
54.14 for determining viscosity of a liquid flowing through an orifice, a nozzle or an extrusion means by measuring pressure.
61.47 for measuring pressure in order to determine the liquid constituent of a liquid mixture.
61.73 for measuring pressure of a liquid in order to determine its solid content.
64.47 For measuring differential pressure to determine vapor pressure.
64.51 for measuring pressure to determine surface tension.
700 for liquid pressure measurement, per se.

By vibration:
This subclass is indented under subclass 61.41. Subject matter wherein the determination is made by utilizing vibration in order to measure or detect the content of or the effect of a constituent of a liquid mixture.

SEE OR SEARCH THIS CLASS, SUBCLASS:
19.03 for measuring the gas content of a liquid by measuring the effect of the liquid on vibration.
24.01 for utilization of vibration to analyze gas.
40.05 for acoustic detection of liquid leakage utilizing pressurized fluid.
54.24 for determining viscosity of a liquid by measuring the force reactance to a member vibrated therein.
54.41 for utilizing vibration to test the viscosity of a liquid.
61.45 for determining a multiphase liquid constituent of a liquid mixture measuring vibration.
61.49 for utilizing vibration to determine the liquid constituent of a liquid mixture.
61.75 for measuring the solid components of a liquid utilizing vibration.
64.42 for testing of a gelling or coagulation property of a liquid utilizing vibration.
64.53 for testing a liquid or a liquid suspension of a solid by utilizing vibration.
592 for detecting liquid leakage and location by utilizing vibration.

Gelling or coagulation:
This subclass is indented under subclass 53.01. Subject matter wherein the determination is made by measuring or detecting the ability of the liquid to coagulate, to form a clot, or to form a stiffened or solid colloid-like mass.

SEE OR SEARCH CLASS:
516, Colloid Systems and Wetting Agents; Subcombinations Thereof; Processes of Making, Stabilizing, Breaking, or Inhibiting, appropriate subclasses for colloid systems or agents for such systems or making or stabilizing such systems or agents, 113 for compositions for or subcombination compositions for or breaking of or inhibiting of colloid systems (e.g., foam breaking, emulsion breaking, dispersion inhibiting, suspension settling, gel breaking, smoke suppressing, coagulating, flocculating), in each instance, when generically claimed or when there is no hierarchically superior provision in the USPC for the specifically claimed art.

By vibration:
This subclass is indented under subclass 64.41. Subject matter wherein the property is being determined by the effect of the liquid upon vibration.

SEE OR SEARCH THIS CLASS, SUBCLASS:
19.03 for measuring the gas content of a liquid by measuring the effect of the liquid on vibration.
40.05 for acoustic detection of liquid leakage utilizing pressurized fluid.
64.53 for testing a liquid or a liquid suspension of a solid by utilizing vibration.
54.41 for the utilization of vibration to test the viscosity of a liquid.
61.45 for the utilization of vibration for determining a multiphase constituent of a liquid mixture.
61.49 for the utilization of vibration to determine the content or the effect of a constituent of a liquid mixture.
61.75 for the utilization of vibration to measure the solid content of a liquid mixture.
61.79 for the utilization of vibration to measure the content or the effect of a constituent of a liquid mixture.
592 for the utilization of vibration to test for liquid leakage or a pipe flaw.

By optical measurement:
This subclass is indented under subclass 64.41. Subject matter wherein the determination is made by measuring or detecting the effect of the liquid on light.

SEE OR SEARCH CLASS:
250, Radiant Energy, appropriate subclass, for a photocell, per se, and 574 for an optical or preoptical system having a liquid in the path thereof wherein the modification of or the emission of the radiant energy resulting from the irradiation of the liquid is tested.
356, Optics: Measuring and Testing, subclass 436 for measuring visible light transmission or absorption of a liquid wherein the test involves no manipulation other than that involved in optical testing.

Vapor-liquid ratio:
This subclass is indented under subclass 53.01. Subject matter wherein the determination is made by measuring the ratio of the amount of vapor above a confined liquid to the volume of the confined liquid.

Vapor pressure:
This subclass is indented under subclass 53.01. Subject matter wherein the determination is made by measuring the pressure of the vapor of a liquid above a confined body of liquid.

SEE OR SEARCH THIS CLASS, SUBCLASS:
54.14 for determining viscosity of the liquid flowing through an orifice, nozzle, or extrusion means by measuring pressure.
61.47 for measuring pressure in order to determine the liquid constituent of a liquid mixture.
61.73 for measuring pressure of a liquid in order to determine its solid content.
61.78 for measuring pressure to determine the content or effect of a constituent of a liquid mixture.
64.46 for measuring differential pressure to determine vapor pressure.
64.51 for measuring pressure to determine surface tension.
700 for liquid pressure measurement, per se.

Differential pressure:
This subclass is indented under subclass 64.45. Subject matter wherein the determination is made by utilizing plural pressures.

Osmotic pressure (e.g., diffusion characteristic):
This subclass is indented under subclass 53.01. Subject matter wherein the determination is made by measuring the pressure due to diffusion of the liquid through a material (e.g., through a member which is selective to one constituent of a liquid; the art term for the member being semi-permeable member).

SEE OR SEARCH THIS CLASS, SUBCLASS:
54.14 for determining viscosity by measuring pressure of the liquid flowing through an orifice, nozzle, or extrusion means.
61.73 for measuring pressure of a liquid in order to determine its solid content.
61.78 for measuring pressure to determine the content or effect of a constituent of a liquid mixture.
64.51 for measuring pressure to determine surface tension.
700 for liquid pressure measurement, per se.

Surface tension:
This subclass is indented under subclass 53.01. Subject matter wherein the determination is made by measuring the contractile strength of the elastic skin effect at the surface of a body of liquid.

By force or torque:
This subclass is indented under subclass 64.48. Subject matter wherein the determination is made by measuring the force or the torque required to immerse the member into or to separate the member from the liquid surface or the force exerted upon a member by the liquid.

By pressure:
This subclass is indented under subclass 64.48. Subject matter wherein the determination is made by measuring a force per unit area.

SEE OR SEARCH THIS CLASS, SUBCLASS:
54.14 for determining viscosity by measuring pressure of the liquid flowing through an orifice, nozzle or extrusion means.
61.47 for measuring pressure in order to determine the liquid constituent of a liquid mixture.
61.73 for measuring pressure of a liquid in order to determine its solid content.
61.78 for measuring pressure to determine the content or effect of a constituent of a liquid mixture.
64.46 for measuring differential pressure to determine vapor pressure.
700 for liquid pressure measurement, per se.
862 for a dynamometer responsive to force or torque.

Liquid droplet:
This subclass is indented under subclass 64.48. Subject matter wherein the determination is made by measuring a characteristic of liquid drops produced by flowing a liquid through an orifice.

By vibration:
This subclass is indented under subclass 53.01. Subject matter wherein the determination is made by measuring the effect of the liquid on vibration.

SEE OR SEARCH THIS CLASS, SUBCLASS:
19.03 for measuring the gas content of a liquid by measuring the effect of the liquid on vibration.
24.01 for utilization of vibration to analyze gas.
40.05 for acoustic detection of liquid leakage utilizing pressurized fluid.
54.24 for determining viscosity of a liquid by measuring the force reactance to a member vibrated therein.
54.41 for utilizing vibration to test the viscosity of a liquid.
61.45 for determining a multiphase liquid constituent of a liquid mixture measuring vibration.
61.49 for utilizing vibration to determine the liquid constituent of a liquid mixture.
61.75 for measuring the solid components of a liquid utilizing vibration.
61.79 for utilizing vibration to determine the effect of the content of a liquid.
64.42 for testing of a gelling or coagulation property of a liquid utilizing vibration.
592 for detecting liquid leakage and location by utilizing vibration.

Molecular weight:
This subclass is indented under subclass 53.01. Subject matter wherein the determination is made by measuring the sum of the atomic weight of a molecule's constituent atoms.

Interface:
This subclass is indented under subclass 53.01. Subject matter wherein the determination is made by detecting or measuring a property of the section along a fluid flow where liquid of a first kind immediately followed by a liquid of a second kind meets.

Sampler, constituent separation, sample handling, or sample preparation:
This subclass is indented under subclass 53.01. Subject matter combined with means for obtaining a predetermined amount of a liquid to be tested, for treating a liquid sample in preparation for its analysis or for isolating individual components of a liquid prior to analysis thereof.
(1) Note. "Sampling" includes: (a) Transporting or handling previously obtained samples of Liquid in preparation for analysis, or (b) introducing previously obtained liquid samples in preparation for analysis, or (c) the preparation of a liquid sample prior to the analysis thereof.

SEE OR SEARCH THIS CLASS, SUBCLASS:
23.41 for a chromatos:graphic gas analyzer including sample preparation or sampling.
23.42 for a chromatos:graphic gas analysis including detail of gas handling.
61.59 for a liquid analyzer using chromatography and including detail of sampling, sample handling, or sample preparation.
155 for the measurement of liquid flow characteristics in a well bore utilizing sampling.
170.29 for the measurement of an oceanos:graphic phenomena combined with sampling the ocean.
863 for liquid sampling, liquid handling or liquid sample preparation, per se.

SEE OR SEARCH CLASS:
4, Baths, Closets, Sinks, and Spittoons, appropriate subclasses for a urine sampler, combined with toilet or means to attach the sampler to the toilet.
23, Chemistry: Physical Processes, appropriate subclasses for a sampling process wherein a step of causing or promoting a chemical reaction, or regulating or controlling a chemical reaction are claimed.
128, Surgery, appropriate 185 for body fluid samplers having means to contact the human body.
141, Fluent Material Handling, With Receiver or Receiver Coacting Means, appropriate subclass, in particularly 21, 29+, 110, and 130 for a device or method of filling a receiver which is not part of a sampling system.
159, Concentrating Evaporators, subclass 30 for a combination of a concentrating vessel with means for withdrawing a quantity of liquid for examination.
166, Wells, in particularly 107, 142+, 162+, and 264 for an apparatus or method for sampling well fluids.
210, Liquid Purification or Separation, 513 for gravitational separators and especially subclasses 514+ for milk and cream separators.
222, Dispensing, appropriate subclass for subject of that class type which may include an apparatus or process for obtaining a predetermined portion of material from a mass but not for testing purposes.
250, Radiant Energy, subclass 288 for mass spectrometers with sample supply.
356, Optics: Measuring and Testing, 36 for subject matter of that class type including sample preparation and subclasses 244+ for sample holders.
374, Thermal Measuring and Testing, subclass 140 for a molten metal lance which may include a sample chamber and subclass 157 a thermometer combined with a sample cup.
417, Pumps, appropriate subclasses for sampling pumps, per se.
422, Chemical Apparatus and Process Disinfecting, Deodorizing, Preserving, or Sterilizing, for a sampler wherein means for causing, promoting, regulating, or controlling a chemical reaction is claimed.
435, Chemistry: Molecular Biology and Microbiology, 309.1 for inoculators, streakers, or samplers adapted for use with micro-organisms and enzymes; and subclass 288.6 for a micro-organism or enzyme measuring and testing apparatus including a column separation means.
604, Surgery, subclass 181 for syringes.

CENTER OF GRAVITY; TURNING MOMENT; METACENTRIC HEIGHT:
This subclass is indented under the class definition. Subject matter comprising an apparatus or method for determining (a) the point at which the entire weight of a body (e.g., a crank or a craft) may be considered as concentrated so that if supported at such a point the body would remain in equilibrium in any position, or (b) the ratio of the torque, applied to a rigid body free to rotate about a given axis, to the angular acceleration thus produced about that axis, or (c) the point of intersection of a vertical line through the center of buoyancy of a floating body with a vertical line through a new center of buoyancy when the body is displaced.
(1) Note. This subclass covers determination of mass distribution and balance of all bodies save rotors.

SEE OR SEARCH THIS CLASS, SUBCLASS:
66 for rotor balancing.
172 for weight distribution on the human foot.

SEE OR SEARCH CLASS:
701, Data Processing: Vehicles, Navigation, and Relative Location, subclass 124 for an electrical processing or data processing system used in the determination of weight distribution of a body where only the nominal structure of a sensor is recited.

Spherical specimen:
This subclass is indented under subclass 65.01. Subject matter wherein the body is bounded by a surface, all points of which are at an equal distance from a point constituting its center.

Ball driving sporting implement (e.g., golf club, baseball bat, etc.):
This subclass is indented under subclass 65.01. Subject matter wherein the body comprises a device for imparting motion to a spherical element used in recreation.

Watercraft (e.g., metacentric height):
This subclass is indented under subclass 65.01. Subject matter wherein the body is a craft for water transport.

Air or space vehicle:
This subclass is indented under subclass 65.01. Subject matter wherein the body is a structure for (a) navigation of the air or (b) orbiting the Earth or traveling beyond the Earth's atmosphere.

Electric sensor:
This subclass is indented under subclass 65.05. Subject matter including means whose electron flow or electron storage characteristic changes in response to the determination being made.

SEE OR SEARCH THIS CLASS, SUBCLASS:
65.09 for an electric sensor, per se, for determining the center of gravity, a turning moment, or a metacentric height.
866.5 for a probe or probe mounting, per se.

SEE OR SEARCH CLASS:
250, Radiant Energy, appropriate subclasses for a light responsive sensor, per se.
310, Electrical Generator or Motor Structure, 311 for a piezoelectric sensor, per se.
338, Electrical Resistors, 2 for a strain gauge, per se, and subclasses 13+ for a condition responsive resistor, per se.
361, Electricity: Electrical Systems and Devices, 280 for a capacitor-type sensor, per se.

Dynamic:
This subclass is indented under subclass 65.01. Subject matter wherein the determination is made by providing motion
to the body.

SEE OR SEARCH THIS CLASS, SUBCLASS:
570 for vibration testing, per se.

Torsional oscillation:
This subclass is indented under subclass 65.07. Subject matter wherein one part of the body swings about a longitudinal axis while the other part of the body is held fast or turned in the opposite direction.

SEE OR SEARCH THIS CLASS, SUBCLASS:
570 for vibration testing, per se.

Electric sensor:
This subclass is indented under subclass 65.01. Subject matter including means whose electron flow or electron storage characteristic changes in response to the determination being made.

SEE OR SEARCH THIS CLASS, SUBCLASS:
65.06 for an electric sensor for determining the center of gravity, a turning moment, or a metacentric height of an air or space vehicle.
866.5 for a probe or probe mounting, per se.

SEE OR SEARCH CLASS:
250, Radiant Energy, appropriate subclasses for a light responsive sensor, per se.
310, Electrical Generator or Motor Structure, 311 for a piezoelectric sensor, per se.
338, Electrical Resistors, appropriate 2 for a strain gauge resistor, per se, and subclasses 13+ for a condition responsive resistor, per se.
361, Electricity: Electrical Systems and Devices, 280 for a capacitor-type sensor, per se.

This subclass is indented under the class definition. Subject matter for determining the amount and/or location of masses or forces causing unbalance in rotatable bodies. The combination of a balance testing device with means to correct for the unbalance is classified with the latter. However, methods of testing for unbalance which broadly recite the additional step of adding or removing material in accordance with the indicated unbalance are found here.

SEE OR SEARCH THIS CLASS, SUBCLASS:
147 for devices for testing the aerodynamic balance of propellers and helicopter rotor blades.

SEE OR SEARCH CLASS:
74, Machine Element or Mechanism, 572 for miscellaneous rotor structures including those having balancing means.
82, Turning, for the combination of balancing by turning.
123, Internal-Combustion Engines, 192.1, for compensating devices for engines, e.g., crank shafts.
219, Electric Heating, for combinations of balancing by electric welding.
408, Cutting by Use of Rotating Axially Moving Tool, subclass 2 for balancing by drilling.
451, Abrading, for the combination of balancing by abrading.

This subclass is indented under the class definition. Subject matter for the determination of either the moisture content of materials (e.g., paper, wood, grain, etc.) or the absorptive characteristics of materials for water or other liquids.

SEE OR SEARCH THIS CLASS, SUBCLASS:
19 for determination of gas content of materials.
29 for determination of the moisture content of gases.
61.41 for determination of moisture or water content of liquids.
335 for hygrometers and hygrostats.

SEE OR SEARCH CLASS:
324, Electricity: Measuring and Testing, appropriate subclasses for means and methods of moisture content determination by electrical apparatus which measures an electrical characteristic such as capacity or conductivity of the medium in which the moisture exists; note particularly 664, 689 and 694+.

This subclass is indented under subclass 73. Subject matter for determination of moisture content by bringing the specimen (usually sand) up to the saturation point while measuring the required addition (residual capacity) as criterion.

This subclass is indented under subclass 73. Subject matter in which the heat conductivity of the specimen is the criterion for determining moisture content.

SEE OR SEARCH CLASS:
374, Thermal Measuring and Testing, 43.

This subclass is indented under subclass 73. Subject matter for determination of moisture content of materials wherein the moisture is extracted, collected, and measured as an index.

SEE OR SEARCH CLASS:
34, Drying and Gas or Vapor Contact With Solids, and see the notes thereto for drying and extraction of liquids from solids in general.

This subclass is indented under subclass 73. Subject matter for determination of moisture content of materials wherein wet and dry bulb temperature readings are employed, as criteria.

SEE OR SEARCH THIS CLASS, SUBCLASS:
338 for wet and dry responsive element hygrometers and hygrostats, per se.

This subclass is indented under the class definition. Subject matter for direct measurement of the hardness of materials.

SEE OR SEARCH THIS CLASS, SUBCLASS:
7 where abrasive or milling characteristic is employed as an index of hardness.
12.01 for other tests in which the specimen is subjected to one or more sudden blows.
104 for durability of cutting edges as an index of hardness.
821 for tests of the crushing point of material, sometimes erroneously designated as "hardness".

SEE OR SEARCH CLASS:
100, Presses, appropriate subclasses for presses not elsewhere provided for.

This subclass is indented under subclass 78. Subject matter wherein hardness is measured or determined by either dropping an object on the specimen and observing rebound, or by dropping the specimen upon an anvil and observing rebound.

This subclass is indented under subclass 78. Subject matter wherein hardness is measured in terms of its resistance to a penetrator or to indentation.

SEE OR SEARCH THIS CLASS, SUBCLASS:
78 for resistance to drilling as index of hardness.
700 for fluid pressure gauges, other than those which measure the hardness of the tire as an index of fluid pressure which are in this subclass (81).

This subclass is indented under subclass 81. Subject matter for measurement of hardness of materials wherein a penetrator or indentor is impelled against the specimen under a predetermined force.

This subclass is indented under subclass 81. Subject matter wherein a penetrator or indentor is urged into the specimen with successive minor (to penetrate the skin) and major loads. Usually the penetration measurement begins with the major load.

This subclass is indented under subclass 81. Subject matter for determining, through resistance to a penetrator, the load sustaining or bearing capacity of soil or foundations.

Penetrator elements or points, per se, or holders therefor employed by the apparatus or processes of subclasses 81+.

SEE OR SEARCH CLASS:
33, Geometrical Instruments, 189.
279, Chucks or Sockets.

This subclass is indented under the class definition. Subject matter for treating specimens with fluids to determine the effect of such fluids on the brittleness or the erosion resistant properties of such specimens.

SEE OR SEARCH THIS CLASS, SUBCLASS:
87 for determination of the instant brittleness rating of a specimen, as compared with embrittlement which is the aging of the material to brittleness.

SEE OR SEARCH CLASS:
422, Chemical Apparatus and Process Disinfecting, Deodorizing, Preserving, or Sterilizing, subclass 53 for corrosion testing apparatus.

This subclass is indented under the class definition. Subject matter for determining the degree of brittleness or ductility of a specimen.

SEE OR SEARCH THIS CLASS, SUBCLASS:
788 for mere determination of strength of materials, as compressive strength, tensile strength, flexing, bending or folding strength, bursting or rupture strength of sheet material, etc.

This subclass is indented under the class definition. Subject matter for testing surfaces and cutting edges for defects. The surface inspection includes such variations as soft spots, cracks, fissures and other flaws not elsewhere classified.

SEE OR SEARCH THIS CLASS, SUBCLASS:
40 for leakage tests.
53.06 for lubricant testing by analyzing characteristics of a measuring surface.
64.48 for measuring the surface tension of a liquid.

SEE OR SEARCH CLASS:
250, Radiant Energy, 302 for methods of using fluorescent and radioactive tracer material to detect flaws.
324, Electricity: Measuring and Testing, subclass 213 and 216 for flaw detection by magnetic tests.
356, Optics: Measuring and Testing, subclass 2 for contour plotting, subclass 69 for cutting blade sharpness tests, and subclass 371 for flatness testing.
374, Thermal Measuring and Testing, 4 for detection of flaws or leaks by thermal effects.
378, X-Ray or Gamma Ray Systems or Devices, 58 for flaw analysis.

This subclass is indented under subclass 104. Subject matter for testing of surfaces for roughness.

SEE OR SEARCH CLASS:
33, Geometrical Instruments, for the measurement of surface contour and depth of valleys.
356, Optics: Measuring and Testing, 445 for light reflection tests including glass and light diffusion tests.

This subclass is indented under the class definition. Subject matter for determining the working efficiency (input vs. output) of power plants or units thereof, such as condensers.

SEE OR SEARCH THIS CLASS, SUBCLASS:
862 for dynamometers.

This subclass is indented under subclass 112. Subject matter for measuring fuel consumption over selected period of operation or distance traveled.

This subclass is indented under subclass 113. Subject matter for indicating at any given instant or for an immediately elapsed period or distance the rate of fuel consumption per mile.

SEE OR SEARCH CLASS:
235, Registers, 61 for "miles per gallon" calculators, where the characteristics of the devices which respond to engine or vehicle operation or to fuel feed are not claimed, though they may be included by name or type as operators of the calculator.

This subclass is indented under subclass 112. Subject matter utilizing the pressure within an engine as a factor of its performance or efficiency.

SEE OR SEARCH CLASS:
346, Recorders, appropriate subclass.

This subclass is indented under the class definition. Subject matter for performing a test on a motor or engine to determine a distinguishing, operational characteristic.

SEE OR SEARCH THIS CLASS, SUBCLASS:
35.01 for testing characteristics of motor fuels in engines.
112 for power unit efficiency tests.
570 for performing similar disparate test utilizing vibrational characteristics.
700 for a gauge for checking compression in an engine.
862 for horsepower tests, work, torque, or engine loading by a dynamometer.

This subclass is indented under subclass 116. Subject matter where the motor drives the vehicle wheels which, in turn, are supported upon rollers or a belt which comprise part of the test means.

SEE OR SEARCH THIS CLASS, SUBCLASS:
123 for other combinations including a roller or belt wheel support.

This subclass is indented under subclass 116. Subject matter including an enclosure or a tank which provides controlled simulated conditions.

This subclass is indented under subclass 116. Subject matter comprising plural means for performing diverse tests on a motor or an engine under operating conditions.

SEE OR SEARCH THIS CLASS, SUBCLASS:
117 for disparate tests while the vehicle wheel is supported on rollers or belt.

This subclass is indented under subclass 117.2. Subject matter where the tests are made without shutdown of the engine during actual operation or on a test stand.

This subclass is indented under subclass 116. Subject matter for obtaining a measurement of thrust as developed by a reaction or reciprocating engine during actual use or on a test stand.

SEE OR SEARCH THIS CLASS, SUBCLASS:
862.381 for direct push or pull thrust measurement only.

Testing auxiliary unit:
This subclass is indented under subclass 116. Subject matter for the testing of auxiliary units of motors and power units, including carburetors, generators, starters, ignition parts, etc.
(1) Note. Ignition testing where the sensing means is mechanical in nature or responsive to pressure is herein included.

SEE OR SEARCH THIS CLASS, SUBCLASS:
49.7 for testing of an auxiliary unit with fluid pressure.

SEE OR SEARCH CLASS:
324, Electricity: Measuring and Testing, 378 for ignition system testing to determine electrical properties by electrical means, and subclasses 181+ where electrical timing is involved.
368, Horology: Time Measuring Systems or Devices, 113 where electrical timing is involved.

Intake air flow:
This subclass is indented under subclass 118.1. Subject matter wherein the auxiliary unit is the air intake passage
of the engine and the measurement is the airflow rate.

SEE OR SEARCH THIS CLASS, SUBCLASS:
861 for the measurement of volume or rate of flow, per se.

This subclass is indented under subclass 116. Subject matter for testing of parts of motors and power apparatus.

SEE OR SEARCH THIS CLASS, SUBCLASS:
47 for leakage tests for pistons, rings, or valves.
49.7 for testing of a motor part with fluid pressure.

This subclass is indented under subclass 119. Subject matter in which a piston ring is the thing tested.

This subclass is indented under the class definition. Subject matter for measuring or testing the action of vehicle brakes.

SEE OR SEARCH THIS CLASS, SUBCLASS:
7 for testing the wear qualities of brake surfaces.
9 for determining friction qualities.
39 for use of fluid pressure to test fluid pressure brake units or systems.

This subclass is indented under subclass 121. Subject matter in which a vehicle wheel engages a yieldably slidable
platform and the brake effect is interpreted by the reactive motion of the platform.

This subclass is indented under subclass 121. Subject matter wherein vehicle wheels are supported upon a belt or roller during the brake test operation.

SEE OR SEARCH THIS CLASS, SUBCLASS:
117 for motor or engine testing involving a roller or belt type of vehicle wheel support.

This subclass is indented under subclass 123. Subject matter wherein the vehicle wheels are supported upon rollers or belt, characterized by the fact that the front and rear wheel supports are relatively shiftable.

This subclass is indented under subclass 123. Subject matter wherein the vehicle and wheels and/or an inertia member is set in motion to simulate the momentum of the vehicle and the brake test is to overcome the inertia effect.

This subclass is indented under subclass 123. Subject matter wherein the vehicle wheels under test while supported upon rollers or belts are driven against the action of the brakes and the driving effort employed is an index of brake condition.

SEE OR SEARCH THIS CLASS, SUBCLASS:
862 for dynamometers usable for determining driving effort of brake testers.

This subclass is indented under subclass 126. Subject matter comprising a portable roller or belt unit (for disposition under the vehicle wheels seriatim), equipped with means for measuring the driving effort.

SEE OR SEARCH THIS CLASS, SUBCLASS:
130 for other forms of single wheel drive and torque measuring testers.

This subclass is indented under subclass 121. Subject matter comprising devices temporarily applied to vehicle in making road brake test.

This subclass is indented under subclass 121. Subject matter, in which the brake testing arrangement is incorporated into the vehicle as a permanent part thereof.

This subclass is indented under subclass 121. Subject matter for rotating an individual vehicle wheel and measuring the required force.

SEE OR SEARCH THIS CLASS, SUBCLASS:
127 for roller or belt wheel support type.

This subclass is indented under subclass 130. Subject matter
comprising a torque measuring lever or lever system, said lever having no ground support or reaction means, for measuring the force required to move a vehicle wheel when out of ground contact against the resistance of its applied brake.

SEE OR SEARCH THIS CLASS, SUBCLASS:
862.21 for similar torque measuring levers.

This subclass is indented under subclass 121. Subject matter comprising devices for depressing brake pedal with a measured force.

SEE OR SEARCH CLASS:
254, Implements or Apparatus for Applying Pushing or Pulling Force, for such devices without measuring means.

This subclass is indented under the class definition. Subject matter for testing of tires, treads or roadways. "Sperry cars" are here included.

SEE OR SEARCH THIS CLASS, SUBCLASS:
8 for tests of such devices by abrasion, milling, rubbing, or scuffing.

This subclass is indented under subclass 146. Subject matter for testing the degree of inflation of tires, inflation sensing means being installed on vehicle structure, wheel or tire, with indicator means disposed on or within the vehicle or wheel.

SEE OR SEARCH THIS CLASS, SUBCLASS:
78 for testing tire inflation by its hardness, or by its resistance to indentation.
862.381 for thrust measuring means, per se.

SEE OR SEARCH CLASS:
116, Signals and Indicators, subclass 34, for mechanical apparatus to indicate merely over or under pressure in tires.
137, Fluid Handling, 227 for tire stem inflation means, usually valves, with a gauge or indicator.
152, Resilient Tires and Wheels, 415 for a wheel or tire having tire inflating means, with or without pressure indicating or measuring means.

This subclass is indented under subclass 146.2. Subject matter including a direct fluid pressure sensing unit communicating with the interior of the tire, as through its valve stem.

SEE OR SEARCH THIS CLASS, SUBCLASS:
700 for fluid pressure gauges of more general utility.

This subclass is indented under subclass 146.3. Subject matter wherein the reading is transmitted to a distant point, usually to the instrument board of the vehicle.

This subclass is indented under subclass 146.4. Subject matter wherein the transmission is by electric means.

This subclass is indented under subclass 146.3. Subject matter wherein the gauge is mounted, or used, on the tire
stem, usually as a replacement for a valve cap.

This subclass is indented under the class definition. Subject matter in the form of wind tunnels; also means for studying the flow of fluid about plane wings, and the behavior of propellers both for air or water.

SEE OR SEARCH THIS CLASS, SUBCLASS:
116 for motor and engine testing.

This subclass is indented under the class definition. Subject matter in the form of basins and tanks for the testing of ship models or ships.

This subclass is indented under the class definition. Subject matter for the measurement of the volumetric content of a selected space or zone.

SEE OR SEARCH THIS CLASS, SUBCLASS:
426 for measuring vessels.

This subclass is indented under the class definition. Subject matter for the testing of coating materials (coverage, drying time, aging, weathering, etc., inks, printing and pen; adhesives and plastics) as to all qualities not provided for in preceding subclasses.

SEE OR SEARCH CLASS:
250, Radiant Energy, 324 for methods and apparatus for corona irradiation of materials, subclasses 432+ for the
irradiation of contained, supported, or transported fluent material, subclasses 453.11+ for the irradiation of supported objects and subclass 493.1 for the irradiation of objects or materials generally.
374, Thermal Measuring and Testing, subclass 7 for determining coating thickness by a thermal measurement.

BOREHOLE OR DRILLING (E.G., DRILL LOADING FACTOR, DRILLING RATE, RATE OF FLUID FLOW):
This subclass is indented under the class definition. Subject matter comprising a process or an apparatus for determining a physical characteristic of a borehole, a casing, or a drill rigging.

SEE OR SEARCH THIS CLASS, SUBCLASS:
19.01 for gas content measuring, per se, especially subclass 19.09 for measuring the gas content of mud.
23.2 for gas analysis, per se.
32 for density measuring, per se.
53.01 for fluid analysis, per se.
170.01 for fluid flow direction measuring, per se, in a naturally occurring body of water.
861 for a rate of fluid flow measuring not in a borehole.
863 for sampling, per se, of mud not in a well and of gas sampling from the soil by means sunk into the ground to a point not far from the surface of the ground, and especially subclass 864.52 for sampling devices comprising a receptacle with suction means.
866 for material analysis, per se.

SEE OR SEARCH CLASS:
33, Geometrical Instruments, 304 for a geometrical indicator for borehole study and especially for a borehole direction or inclination indicator.
116, Signals and Indicators, 112 for mechanical indicators of a predetermined fluid flow and subclasses 264+ for a mechanical indicator of the presence or the absence of fluid flow where no measuring transducer is recited.
166, Wells, subclass 64, 66, and 113 for well structure combined with measuring and testing means wherein more
structure than is necessary to perfect the testing is recited, subclass 250.02 for a comprehensive well process combined with permeability determining wherein more well detail than is necessary to determine permeability is recited, and subclass 264 for a well process comprising merely sampling a well fluid.
175, Boring or Penetrating the Earth, 40 for a process or means of measuring or testing combined with more than a nominal recitation of an earth boring process or apparatus.
250, Radiant Energy, 256 for testing in a well bore by measuring radiant energy.
324, Electricity: Measuring and Testing, 323 and 355+ for measuring an electrical property of a borehole, in particular subclasses 366+ for well logging involving measuring an electrical property of borehole formation, and subclass 425 for measuring electrolyte properties, per se.
340, Communications: Electrical, 853.1 for well bore telemetry wherein information signals are transmitted to or from means located in a passageway in the earth.
342, Communications: Directive Radio Wave Systems and Devices (e.g., Radar, Radio Navigation), subclass 22 for a radar system which is used in geophysical exploration, as for example, radar sets which are lowered down a borehole to determine the size of the borehole.
346, Recorders, appropriate subclasses for recorders for recording the operation of machines and especially 33 for a recorder combined with external recorder operating means including a well logging device, and subclasses 112+ for a graph-type recorder.
356, Optics: Measuring and Testing, subclasses 241.1+ for making borehole or drilling study by measuring visible light.
364, Electrical Computers and Data Processing Systems, subclass 506 for application of an electrical computer or data processing to testing of borehole or drilling when significant electrical computer or data processing detail combined with a nominally recited sensor are recited.
367, Communications, Electrical: Acoustic Wave Systems and Devices, 25 for the communication of information or intelligence in the form of acoustic waves traveling through earth and detected by electric signal handling means passing through a well bore and providing information pertaining to a characteristic or a location of discontinuities within the earth, subclasses 81+ for the communication of information or intelligence in a well bore in the form of acoustic waves traveling in a medium in the well bore different from the surrounding earth and providing information pertaining to a characteristic or a location of discontinuities within the
earth, and subclasses 86+ for the communication of information or intelligence in the form of acoustic waves traveling through earth detected by electric signal handling means passing through a well bore and providing information pertaining to a characteristic or a location of discontinuities within the earth for electroacoustic borehole testing and wherein the intelligence pertains to the walls of the borehole and is obtained from a device which travels through the passageway and emits acoustic waves into a medium contained within the borehole (e.g., water, air, etc.) which are reflected from the walls back to the device and are detected.
374, Thermal Measuring and Testing, subclass 136 for measuring a temperature at a single location in a well bore.
422, Chemical Apparatus and Process Disinfecting, Deodorizing, Preserving, or Sterilizing, appropriate subclass for testing involving a chemical reaction.
435, Chemistry: Molecular Biology and Microbiology, subclass 9 for a process for quantitative or qualitative testing for mineral deposits by use of microorganisms which thrive in the presence of such minerals.
436, Chemistry: Analytical and Immunological Testing, 25 for a chemical analysis of a borehole.

Formation logging (e.g., borehole studies of pressure derivatives or of pressure-temperature derivatives):
This subclass is indented under subclass 152.01. Subject matter wherein the determination of the physical characteristic of earth both below the surface of the earth and along a surface forming the periphery of the borehole is made by measuring a parameter at plural positions within the borehole.
(1) Note. This subclass generally contains subject matter drawn to the measurement of plural kinds of parameters of a formation in a borehole. However, the measurement of a single kind of parameter at plural positions within a borehole, not provided for elsewhere, is also found here. When two parameters of the formation are being measured and one of the parameters is the depth at which a second parameter is being measured, then the subject matter is found where the second parameter is found.
(2) Note. Generally, the devices included here include a process or an apparatus for correlating the measurement of the physical characteristic of the earth with a measured depth.

SEE OR SEARCH THIS CLASS, SUBCLASS:
152.24 for a flow study involving taking a sample from a formation wall.
152.44 for the identification of a formation from the relative ease with which a drill penetrates the formation.

SEE OR SEARCH CLASS:
33, Geometrical Instruments, appropriate subclasses for instruments, per se, for measuring a distance, an angle, or the like in a well, and in particular subclass 302 and 304+ for borehole direction or inclination indicators.
181, Acoustics, 102 for well logging wherein acoustical waves are transmitted or received for the purpose of identifying geologic or subsurface structure.
324, Electricity: Measuring and Testing, 366 for well logging involving measuring electrical properties of earth formations in a well bore.
356, Optics: Measuring and Testing, appropriate subclasses for borehole study by measuring visible light.
364, Electrical Computers and Data Processing Systems, 422 for an application of electrical computers and data processing to well logging wherein details of the computer or the data processing system combined with only a nominally recited sensor are recited.
367, Communications, Electrical: Acoustic Wave Systems and Devices, 25 for utilizing traveling stresses in the earth which are detected or generated by electric signal handling means wherein the electric signal represents communicated information or intelligence regarding a characteristic or location of discontinuities in a formation in a borehole.
374, Thermal Measuring and Testing, subclass 136 for measuring temperature at a single location in a well bore.
435, Chemistry: Molecular Biology and Microbiology, subclass 9 for a process for quantitative or qualitative testing for mineral deposits within a borehole formation by use of enzymes or microorganisms which thrive in the presence of such minerals.
436, Chemistry: Analytical and Immunological Testing, 25 for a chemical analysis of a borehole formation.

During drilling:
This subclass is indented under subclass 152.02. Subject matter wherein the determination of the physical characteristic of the borehole is made by making a measurement of the physical condition of the borehole during the formation of or the enlargement of an elongated hole in the earth in situ by dislocating solid material of the earth.

SEE OR SEARCH THIS CLASS, SUBCLASS:
152.19 for determining a physical characteristic of a borehole, a casing, or a drill rigging by measuring a fluid flow during drilling.
152.43 for making a determination of a physical characteristic of a borehole, a casing, or a drill rigging while drilling.

SEE OR SEARCH CLASS:
175, Boring or Penetrating the Earth, subclass 50 for a process or an apparatus for boring into the earth combined with a measuring or indicating feature and wherein more than a mere step of boring is claimed.
250, Radiant Energy, subclass 254 for an apparatus or a method for making a geological test using radiant energy wherein drilling is involved.
324, Electricity: Measuring and Testing, 324 for a purely electrical measurement of a borehole fluid, subclass 356 for measuring an electrical property in a borehole while drilling, subclass 369 for well logging while drilling wherein an electrical property of an earth formation is measured, and subclass 694 for measuring resistance or conductance in order to determine water content.
356, Optics: Measuring and Testing, appropriate subclass for an apparatus or a method for testing drilling mud by measuring visible light.

By drill mud analysis:
This subclass is indented under subclass 152.03. Subject matter wherein mud is continuously circulated into and out of a borehole and a determination of the physical characteristic of the borehole is made by measuring a condition of, a constituent of, or a composition of the mud while the mud is being circulated.

SEE OR SEARCH THIS CLASS, SUBCLASS:
19.09 for determining the amount of gas in mud, per se.
61.41 for the analysis of mud, per se.

SEE OR SEARCH CLASS:
166, Wells, for well mud sampling per se.
250, Radiant Energy, 253 for an apparatus or a method of testing drilling mud by measuring invisible radiant energy.
324, Electricity: Measuring and Testing, 324 for a purely electrical measurement of a borehole fluid, subclass 356 for measuring an electrical property in a borehole while drilling, subclass 369 for well logging while drilling wherein an electrical property of an earth formation is measured, and subclass 694 for measuring resistance or conductance in order to determine water content.
356, Optics: Measuring and Testing, appropriate subclass for drilling mud analysis by measuring visible light.
364, Electrical Computers and Data Processing Systems, 509 for the application of an electrical computer or data processing for testing drilling mud wherein computer apparatus detail or data processing combined with only a nominally recited sensor are recited.
378, X-Ray or Gamma Ray Systems or Devices, appropriate subclass for testing drilling mud by measuring a property of an X-ray or a gamma ray.
422, Chemical Apparatus and Process Disinfecting, Deodorizing, Preserving, or Sterilizing, subclass 68.1 for a chemical apparatus for analyzing a drilling mud involving a chemical reaction.
435, Chemistry: Molecular Biology and Microbiology, subclass 9 for a process for quantitative or qualitative testing for mineral deposits by detecting microorganisms which thrive in the presence of such minerals.
436, Chemistry: Analytical and Immunological Testing, 25 for chemical testing of fluids within a borehole, especially subclasses 29+ for petroleum oils or carbonaceous minerals and subclass 30 for testing drilling mud.

Density, porosity, or permeability:
This subclass is indented under subclass 152.02. Subject matter wherein the determination of the physical characteristic of the formation is made by measuring (a) a mass per unit volume of either a bulk formation of a borehole or of selected constituents of a formation of a borehole, (b)
the ratio of a volume of interstices of either a bulk formation of a borehole or of selected constituents of a formation of a borehole to its volume, or (c) a quality of either a bulk formation of a borehole or of selected constituents of a formation of a borehole to be penetrated by a liquid or a gas passing through pores or openings therein.

SEE OR SEARCH THIS CLASS, SUBCLASS:
30.01 for measuring the density of a gas.
32 for measuring the density of a solid or a liquid.
38 for measuring porosity or permeability by use of fluid pressure.
73 for measuring the moisture content or absorption characteristic of a material.
152.41 for determination of permeability by the injection of fluid into a formation of a borehole.

SEE OR SEARCH CLASS:
378, X-Ray or Gamma Ray Systems or Devices, appropriate subclass for testing by measuring a property of X-rays or gamma rays and in particular for 54 for determining density by measuring a property of X-rays or gamma rays.

Including oil, gas, or water saturation:
This subclass is indented under subclass 152.05. Subject matter wherein the determination of the characteristic of the borehole includes measuring a maximum impregnation by oil, gas, or water of a bulk formation of a borehole or of selected constituents of a formation of a borehole.
(1) Note. Fluid saturation of the formation zone may be measured directly by radiation, electrical, acoustical, or other means or by comparison tests in which fluid originally occurring in a formation is replaced by fluid having a known makeup.

SEE OR SEARCH THIS CLASS, SUBCLASS:
38 for measuring porosity or permeability by use of fluid pressure.
73 for measuring the moisture content or absorption characteristic of a material.
152.08 for determination of a formation logging by measuring oil, gas, or water saturation.
152.41 for determination of saturation by the injection of fluid into a formation of a borehole.

SEE OR SEARCH CLASS:
324, Electricity: Measuring and Testing, 324 for a purely electrical measurement of a borehole fluid, subclass 356 for measuring an electrical property in a borehole while drilling, and subclass 694 for measuring resistance or conductance in order to determine water content.

By a core sample analysis:
This subclass is indented under subclass 152.05. Subject matter including a sample in the form of an undisturbed portion removed from the formation and wherein the determination of the physical characteristic of the borehole is made by analysis of the portion.

SEE OR SEARCH THIS CLASS, SUBCLASS:
152.09 for formation logging by measuring an oil, gas, or water saturation of a core sample.
152.11 for formation logging by measuring a property of a core sample.
864.44 for sampling, per se, by use of a corer.
866 for the testing of solid material, per se.

SEE OR SEARCH CLASS:
175, Boring or Penetrating the Earth, subclass 58 for a process of obtaining a core sample from a borehole formation and subclass 403+ and the notes there noted for a bit for cutting an earth core.
324, Electricity: Measuring and Testing, 376 for a purely electrical measurement of a property of a subsurface core sample.

Oil, gas, or water saturation:
This subclass is indented under subclass 152.02. Subject matter wherein the determination of the physical characteristic of the borehole is made by measuring the maximum impregnation by gas, water, or oil of a bulk
formation of a borehole or of selected constituents of a formation of a borehole.
(1) Note. Fluid saturation of the formation zone may be measured directly by radiation, electrical, acoustical, or other means or by comparison tests in which fluid originally occurring in a formation is replaced by fluid having a known makeup.

SEE OR SEARCH THIS CLASS, SUBCLASS:
38 for measuring porosity or permeability by use of fluid pressure.
73 for measuring a moisture content or absorption characteristic of a material.
152.06 for a borehole formation logging by density, porosity, and permeability measuring and the measurement of oil, gas, or water saturation.
152.41 for a determination of a borehole physical characteristic by measuring saturation by the injection of fluid into a formation of a borehole.

SEE OR SEARCH CLASS:
324, Electricity: Measuring and Testing, 324 for a purely electrical measurement of a borehole fluid, subclass 356 for measuring an electrical property in a borehole while drilling, and subclass 694 for measuring resistance or conductance in order to determine water content.

By a core sample analysis:
This subclass is indented under subclass 152.08. Subject matter including a sample in the form of an undisturbed portion removed from the formation and wherein the determination of the physical characteristic of the borehole is made by analyzing the portion.

SEE OR SEARCH THIS CLASS, SUBCLASS:
152.07 for formation logging by determining the density, the porosity, or the permeability of a core sample.
152.11 for formation logging by measuring a property of a core sample, per se.
864.44 for sampling, per se, by use of a corer.
866 for the testing of solid material, per se.

SEE OR SEARCH CLASS:
175, Boring or Penetrating the Earth, subclass 58 for a process of obtaining a core sample from a borehole formation and subclasses 403+ and the notes there noted for a bit for cutting an earth core.
324, Electricity: Measuring and Testing, 376 for a purely electrical measurement of a property of a subsurface core sample.

By a core sample analysis:
This subclass is indented under subclass 152.02. Subject matter including a sample in the form of an undisturbed portion removed from the formation and wherein the determination of the physical characteristic of the borehole is made by analysis of the portion.

SEE OR SEARCH THIS CLASS, SUBCLASS:
152.07 for formation logging by determining the density, the porosity, or the permeability of a core sample.
152.09 for formation logging by measuring a gas, a water, or an oil saturation of a core sample.
864.44 for obtaining a core sample, per se.
866 for the testing of solid material, per se.

SEE OR SEARCH CLASS:
175, Boring or Penetrating the Earth, subclass 58 for a process of obtaining a core sample from a borehole formation and subclasses 403+ and the notes there noted for a bit for cutting an earth core.
324, Electricity: Measuring and Testing, 376 for a purely electrical measurement of a property of a subsurface core sample.

Thermal:
This subclass is indented under subclass 152.02. Subject matter wherein the determination of the physical characteristic of the borehole is made by (a) measuring temperature at plural positions within the borehole or (b) measuring temperature related parameters at plural positions
within the borehole.

SEE OR SEARCH CLASS:
374, Thermal Measuring and Testing, 10 for temperature gradient measuring, per se; subclasses 29+ for heat flux measuring, per se; subclasses 45+ for thermal testing of a nonthermal property, per se; and subclass 136 for temperature measuring in a well bore wherein no more than one temperature measurement in a well bore is made and no other parameter of the strata or the well bore is measured.

With heating or cooling:
This subclass is indented under subclass 152.12. Subject matter including means to alter a temperature and wherein (a) the temperature altering means changes a temperature of the apparatus for making the determination of the physical characteristic of the formation or (b) the apparatus for making the determination of the physical characteristic of the formation within the borehole alters the temperature of the borehole.

With radioactivity measuring:
This subclass is indented under subclass 152.02. Subject matter including plural types of tests and wherein one of the tests makes a determination of a physical characteristic of the borehole, the casing, or the drill rigging by measuring naturally occurring radiation or radiation produced either (a) from a radiation source or (b) as a result of bombardment of elements of the formation by radiation of a different type.

SEE OR SEARCH CLASS:
250, Radiant Energy, 256 for a well testing apparatus and method measuring invisible light, subclass 257 for a well testing apparatus and method measuring invisible light and combined with detecting the location of a casing collar, and in particular, subclasses 260 and 269.1+ for a well testing device utilizing detection of radioactivity and not combined with a test other than one measuring invisible light.
378, X-Ray or Gamma Ray Systems or Devices, appropriate subclass for the application of an X-ray or gamma ray system, per se, to testing.

With vibration measuring:
This subclass is indented under subclass 152.14. Subject matter wherein one of the tests makes a determination of a physical characteristic of the borehole, the casing or the drill rigging by measuring the effect of the borehole, the casing, or the drill rigging on induced, reflected, or transmitted vibration.

SEE OR SEARCH THIS CLASS, SUBCLASS:
152.16 for a formation logging apparatus including plural types of tests, one of which includes measuring vibration.
152.32 for determining a rate of fluid flow within a borehole by measuring the effect of the rate of fluid flow on vibration.
152.47 for making a downhole measurement of a characteristic of a borehole, a casing or a drill rigging by measuring vibration during drilling.
152.57 for determining a condition of a cementing in a borehole, per se, by measuring vibration.
152.58 for determining a physical condition of a borehole, a casing, or a drill rigging by making a measurement of vibration by an instrument located within a borehole.
570 for measuring and testing, per se, by use of vibration.

SEE OR SEARCH CLASS:
181, Acoustics, 102 for acoustic well logging.
367, Communications, Electrical: Acoustic Wave Systems and Devices, 25 for the communication of information or intelligence in the form of acoustic waves traveling through earth and detected by electric signal handling means passing through a well bore and providing information pertaining to a characteristic or a location of discontinuities within the earth, subclasses 81+ for the communication of information or intelligence traveling through earth in a well bore in the form of acoustic waves traveling in a medium in the well bore different from the surrounding earth and providing information pertaining to a characteristic or a location of discontinuities within the earth, and subclasses 86+ for the communication of information or intelligence in the form of acoustic waves traveling through earth detected by electric signal handling means passing through a well bore and providing information pertaining to a characteristic of the borehole or a location of discontinuities within the earth for electroacoustic borehole testing and wherein the intelligence pertains to the walls of the borehole and is
obtained from a device which travels through the passageway and emits acoustic waves into a medium contained within the borehole (e.g., water, air, etc.) which are reflected from the walls back to the device and are detected.

With vibration measuring:
This subclass is indented under subclass 152.02. Subject matter including plural types of tests and wherein one of the tests makes a determination of a physical characteristic of the borehole, the casing, or the drill rigging by measuring an effect of the borehole, the casing, or the drill rigging on induced, reflected, or transmitted vibration.

SEE OR SEARCH THIS CLASS, SUBCLASS:
152.15 for determining a formation logging by plural tests including measurements of radiation and vibration.
152.32 for determining a rate of fluid flow within a borehole by measuring the effect of the rate of fluid flow on vibration.
152.47 for making a downhole measurement of a characteristic of a borehole, a casing, or a drill rigging by measuring vibration during drilling.
152.57 for determining a condition of a cementing in a borehole, per se, by measuring vibration.
152.58 for determining a physical condition of a borehole, a casing, or a drill rigging by making a measurement of vibration by an instrument located within the borehole.
570 for measuring and testing, per se, by use of vibration.

SEE OR SEARCH CLASS:
181, Acoustics, 102 for acoustic well logging.
367, Communications, Electrical: Acoustic Wave Systems and Devices, 25 for the communication of information or intelligence in the form of acoustic waves traveling through earth and detected by electric signal handling means passing through a well bore and providing information pertaining to a characteristic or a location of discontinuities within the earth, subclasses 81+ for the communication of information or intelligence in a well bore in the form of acoustic waves traveling in a medium in the well bore different from the surrounding earth and providing information pertaining to a characteristic or a location of discontinuities within the earth, and subclasses 86+ for the communication of information or intelligence in the form of acoustic waves
traveling through earth detected by electric signal handling means passing through a well bore and providing information pertaining to a characteristic of the well bore or a location of discontinuities within the earth for electroacoustic borehole testing and wherein the intelligence pertains to the walls of the borehole and is obtained from a device which travels through the passageway and emits acoustic waves into a medium contained within the borehole (e.g., water, air, etc.) which are reflected from the walls back to the device and are detected.

With detail of a borehole wall engaging means:
This subclass is indented under subclass 152.02. Subject matter including a structure engaging a wall of the borehole either for positioning or for maintaining the positioning of the apparatus while the test is being performed and wherein significance is attributed to the structure engaging the wall.

SEE OR SEARCH CLASS:
166, Wells, subclass 241.5 for wall engaging means for well logging devices wherein more well structure is recited than is necessary for perfecting the test.
250, Radiant Energy, subclass 286 for borehole wall engaging means for a well testing apparatus and method.

Fluid flow measuring or fluid analysis:
This subclass is indented under subclass 152.01. Subject matter wherein the determination of the physical characteristic of the borehole, the casing, or the drill rigging is made by either (a) detecting the movement of or the presence of a fluid which has traveled either (1) from the formation into the borehole, (2) from the borehole into the formation, (3) from the outside of the borehole into the borehole, or (d) from inside the borehole to the outside of the borehole; (b) measuring a rate, a direction, or a magnitude of fluid flow either (1) from the formation into the borehole, (2) from the borehole into the formation, (3) from the outside of the borehole into the borehole, or (4) from inside the borehole to the outside of the borehole, or (c) detecting or measuring the presence of or an amount of a constituent of a fluid within the borehole, the ratio of one constituent of the fluid to another constituent of the fluid or the effect of a constituent of the fluid.
(1) Note. Production indices are included here.

SEE OR SEARCH THIS CLASS, SUBCLASS:
19.1 for measuring the gaseous content of a liquid.
53.01 for liquid analysis, per se.
170.01 for fluid flow direction determination not in a borehole or in a drilling study.
861 for volume or rate of fluid flow determination, per se.

SEE OR SEARCH CLASS:
116, Signals and Indicators, 112 for a mechanical alarm, per se, giving a humanly perceptible signal in response to a predetermined fluid flow and subclasses 264 for a mechanical indicator structure, per se, giving a humanly perceptible signal in response to the presence or absence of fluid flow.
166, Wells, appropriate subclass for the combination of a well structure and fluid flow measuring wherein more well structure is recited than that which is necessary for perfecting the measurement.
175, Boring or Penetrating the Earth, subclass 48 for measurement of or an indication of drilling fluid flow combined with more than a mere boring step or detail of a boring apparatus.
250, Radiant Energy, 253 for the testing of well fluid by measuring a property of invisible light and subclass 301 for a method of determining oil presence, contamination, or concentration.
324, Electricity: Measuring and Testing, subclass 306 for measuring a rate of fluid flow by subjecting the fluid to magnetic resonance.
340, Communications: Electrical, 603 for an electrical indicator or alarm providing a humanly perceptible signal in response to a predetermined fluid flow and providing no quantitative measurement.
356, Optics: Measuring and Testing, appropriate subclass for testing fluid by measuring a characteristic of visible light.
364, Electrical Computers and Data Processing Systems, subclass 422 for application of an electrical computer or data processing to borehole logging when significant electrical computer or data processing detail and nominal transducer detail is recited and subclass 510 for application of an electrical computer or data processing to the measurement of flow when significant electrical computer or data processing detail and only nominal sensor detail are
recited.
378, X-Ray or Gamma Ray Systems or Devices, appropriate subclass for fluid analysis by measuring a property of X-rays or gamma rays.
422, Chemical Apparatus and Process Disinfecting, Deodorizing, Preserving, or Sterilizing, 68.1 for a chemical apparatus for analyzing a liquid.
435, Chemistry: Molecular Biology and Microbiology, subclass 9 for the detection of the presence of fluids within a borehole by sensing the presence of microorganisms in the vicinity of the fluid.
436, Chemistry: Analytical and Immunological Testing, 25 for chemical testing of fluids within a borehole, especially subclasses 29+ for petroleum oils or carbonaceous minerals, and subclass 30 for testing drilling mud.

During drilling:
This subclass is indented under subclass 152.18. Subject matter wherein the determination of the characteristic of the borehole, the casing, or the drill rigging is made during the process of making or enlarging an elongated hole in the earth in situ by dislocating a solid material in the earth.

SEE OR SEARCH THIS CLASS, SUBCLASS:
152.03 for formation logging during a drilling operation.
152.21 for determining a physical characteristic of a borehole, a casing, or a drill rigging by measuring a fluid flow during drilling.
152.43 for determining a physical characteristic of a borehole, a casing, or a drill rigging during a drilling operation.

SEE OR SEARCH CLASS:
175, Boring or Penetrating the Earth, 40 for a process or an apparatus for boring into the earth combined with a measuring or indicating feature and wherein more than a mere step of boring is claimed.
250, Radiant Energy, subclass 254 for an apparatus or a method for making a geological test using radiant energy wherein drilling is involved.
324, Electricity: Measuring and Testing, 324 for a purely electrical measurement of a borehole fluid, subclass 356 for
measuring an electrical property in a borehole while drilling, subclass 369 for well logging while drilling wherein an electrical property of an earth formation is measured, and subclass 694 for measuring resistance or conductance in order to determine water content.
356, Optics: Measuring and Testing, appropriate subclass for an apparatus or a method for testing drilling mud by measuring visible light.
436, Chemistry: Analytical and Immunological Testing, 25 for a chemical analyzer for conducting a test within the earth's crust.

Rate of fluid flow:
This subclass is indented under subclass 152.19. Subject matter wherein the determination of the characteristic of the borehole, the casing, or the drill rigging is made by measuring a speed of flow, a volume rate of fluid flow, or a mass rate of fluid flow.

SEE OR SEARCH THIS CLASS, SUBCLASS:
54.07 and 54.13, for determining viscosity by measuring a rate of fluid flow.
61.64 for measuring settling or filtering ability of a constituent of a liquid mixture by measuring a rate of fluid flow.
61.73 for measuring solid components by measuring a rate of fluid flow.
152.29 for measuring a rate of flow of a fluid in a borehole.
170.07 and 170.11+, for fluid flow direction determination not in a borehole or in a drilling study.
861 for measuring a rate of fluid flow, per se.

SEE OR SEARCH CLASS:
116, Signals and Indicators, 112 for a mechanical alarm, per se, producing a humanly perceptible signal in response to a rate of fluid flow within a borehole, a casing, or a drill rigging; and subclasses 264+ for a mechanical indicator structure, per se, providing a humanly perceptible signal responsive to a rate of fluid flow within a borehole, a casing, or a drill rigging.
175, Boring or Penetrating the Earth, subclass 48 for
measurement or indication of drilling fluid rate of flow combined with more than a mere boring step or details of a boring apparatus.
250, Radiant Energy, 253 for determining rate of a fluid flow within a borehole, a casing, or a drill rigging by measuring invisible light.
324, Electricity: Measuring and Testing, subclass 306 for determining a rate of flow of a volume of fluid within a borehole, a casing, or a drill rigging by subjecting the fluid to magnetic resonance, and subclasses 324+ for a determination of a rate of fluid flow within a borehole by making a purely electrical measurement.
340, Communications: Electrical, 608 for an electrical indicator providing a humanly perceptible signal in response to a predetermined rate of flow of a fluid flowing within a borehole, a casing, or a drill rigging and not providing a quantitative measurement.
356, Optics: Measuring and Testing, appropriate subclass for determining a rate of flow of a fluid in a borehole, a casing, or a drill rigging by measuring visible light.
364, Electrical Computers and Data Processing Systems, 420 for application of an electrical computer or data processing to a determination of a rate of fluid flow in a borehole, a casing, or a drill rigging when significant electrical computer or data processing detail and nominal transducer detail are recited, and subclass 510 for application of an electrical computer or data processing to a determination of rate of fluid flow, per se, when significant electrical computer or data processing detail and nominally recited sensor are claimed.
378, X-Ray or Gamma Ray Systems or Devices, appropriate subclass for determining the flow rate of a fluid in a borehole, a casing, or a drill rigging by measuring a property of an X-ray or a gamma ray.

Pressure:
This subclass is indented under subclass 152.19. Subject matter wherein the determination of the characteristic of the borehole, the casing, or the drill rigging is made by measuring pressure.

SEE OR SEARCH THIS CLASS, SUBCLASS:
37 for performing a test by use of fluid pressure.
152.27 for a determination of fluid flow by measuring
pressure combined with sampling.
152.51 for a determination of a physical condition of a borehole, a casing, or a drill rigging by measuring pressure.
700 for fluid pressure measuring, per se.
760 for stress or strain measuring or testing by stress or strain.
862 for force measuring, per se.

SEE OR SEARCH CLASS:
116, Signals and Indicators, 112 for a pressure responsive mechanical alarm, per se, providing a humanly perceptible signal in response to a predetermined fluid flow, and subclasses 266+ for a pressure responsive mechanical indicator which provides a humanly perceptible signal in response to the presence or the absence of fluid flow.
166, Wells, subclass 64, 66, and 113 for detail of a well combined with determination of fluid flow by measuring or detecting pressure wherein more structure than is necessary to perfect the testing is recited.
175, Boring or Penetrating the Earth, 48 for a process or a means of determining fluid flow by measuring or detecting pressure combined with more than a nominal recitation of an earth boring process or apparatus.
340, Communications: Electrical, subclass 611 for an electrical indicator or an electrical alarm which provides a humanly perceptible signal in response to a predetermined fluid flow via monitoring pressure and subclass 626 for an electrical indicator or alarm which provides a humanly perceptible signal in response to the detection of a predetermined pressure.
364, Electrical Computers and Data Processing Systems, 420 for the application of an electrical computer or data processing to the determination of fluid flow in a borehole by measuring pressure when significant electrical computer or data processing detail combined with no more than a nominally recited sensor are claimed.

With sampling:
This subclass is indented under subclass 152.18. Subject matter including means for obtaining a predetermined portion of the fluid to be tested.

SEE OR SEARCH THIS CLASS, SUBCLASS:
23.41 for sampling combined with a gas analyzer.
61.55 for sampling combined with an apparatus for measuring a content or an effect of a constituent of a liquid mixture.
64.56 for a sampling combined with a liquid analyzer.
152.07 for formation logging by measuring density, porosity, or permeability of a core sample.
152.09 for formation logging by measuring oil, gas, or water saturation of a core sample.
152.11 for formation logging, per se, by a core sample analysis.
863 for sampling, per se, of mud not in a well and of gas sampling from the soil by means sunk into the ground to a point not far from the surface of the ground and especially subclass 864.52 for sampling devices comprising a receptacle with suction means.

SEE OR SEARCH CLASS:
166, Wells, appropriate subclass, especially 107, 142+, and 162+ for the combination of a well structure and fluid flow measuring wherein more well structure is recited than that which is necessary for perfecting the measurement or subclass 264 for sampling well fluids (including gas), per se.
175, Boring or Penetrating the Earth, subclass 48 for measuring or indicating drilling fluid flow combined with more than a mere boring step or detail of a boring apparatus and subclasses 232+, 244+, and 308+ for means to receive and retain a sample from an earth formation, including solid earth, in an earth boring tool.

From formation wall:
This subclass is indented under subclass 152.23. Subject matter wherein the sample is taken of fluid flowing from the formation into the borehole.

SEE OR SEARCH THIS CLASS, SUBCLASS:
152.02 for a borehole study by formation logging.

With a filter:
This subclass is indented under subclass 152.24. Subject matter including a barrier having interstices, pores, or micropores through which at least part of the fluid flows but which traps some components of the fluid, usually particles.

SEE OR SEARCH THIS CLASS, SUBCLASS:
61.72 for making a determination of solid components of a liquid by separation of the solid from the liquid and subsequent measuring.
863.23 for sampling, per se, combined with using a filter to separate constituents of a sample.

SEE OR SEARCH CLASS:
210, Liquid Purification or Separation, appropriate subclass for a filter, per se.

With sealing detail:
This subclass is indented under subclass 152.24. Subject matter including means between a sample induction means and the formation wall which prevents the contamination of formation samples with borehole fluids and wherein significance is attributed to the contamination prevention means.

SEE OR SEARCH CLASS:
166, Wells, subclass 100 for a lateral probe or port sealed against a well wall.
277, Joint Packing, appropriate subclass for seals, per se.

Pressure:
This subclass is indented under subclass 152.23. Subject matter wherein the determination of the characteristic of the borehole is made by measuring pressure.

SEE OR SEARCH THIS CLASS, SUBCLASS:
37 for performing a test by use of fluid pressure.
152.22 for determination of fluid flow during drilling by measuring pressure.
152.51 for a determination of a physical condition of a borehole, a casing, or a drill rigging by measuring pressure.
700 for fluid pressure measuring, per se.
760 for stress or strain measuring or testing by stress or strain.
862 for force measuring, per se.

SEE OR SEARCH CLASS:
116, Signals and Indicators, 112 for a pressure responsive mechanical alarm, per se, providing a humanly perceptible signal in response to a predetermined fluid flow, and subclass 266 for a pressure responsive mechanical indicator which provides a humanly perceptible signal in response to the presence or the absence of fluid flow, in a borehole, a casing, or a drill rigging.
166, Wells, subclass 64, 66, and 113 for detail of a well combined with determination of fluid flow by measuring or detecting pressure in a borehole wherein more well detail than is necessary to perfect the testing is recited.
175, Boring or Penetrating the Earth, 40 for a process or means of determining fluid flow by measuring or detecting pressure combined with more than a nominal recitation of an earth boring process or apparatus.
340, Communications: Electrical, subclass 611 for an electrical indicator or an electrical alarm which provides a humanly perceptible signal in response to a predetermined fluid flow via monitoring pressure in a borehole, a casing, or a drill rigging, and subclass 626 for an electrical indicator or alarm, per se, which provides a humanly perceptible signal in response to the detection of a predetermined pressure in a borehole, a casing, or a drill rigging.
364, Electrical Computers and Data Processing Systems, 420 for the application of an electrical computer or data processing to the determination of fluid flow in a borehole, a casing, or a drill rigging by measuring pressure when significant electrical computer or data processing detail combined with a nominally recited sensor are claimed.

Downhole:
This subclass is indented under subclass 152.23. Subject matter wherein the apparatus for the determination of a
characteristic of the borehole, the casing, or the drill rigging is located within the borehole while the measurement is being made.

SEE OR SEARCH THIS CLASS, SUBCLASS:
152.02 for a downhole formation logging instrument.
152.18 for a downhole fluid flow instrument or a downhole fluid analysis instrument not combined with sampling means.
152.46 for making a nonfluid flow downhole measurement in a borehole while drilling.
152.55 for making a downhole fluid test, per se, in a borehole.

Rate of fluid flow:
This subclass is indented under subclass 152.18. Subject matter wherein the determination of the characteristic of the borehole, the casing, or the drill rigging is made by measuring a speed of flow, a volume rate of flow, or a mass rate of flow of a fluid.

SEE OR SEARCH THIS CLASS, SUBCLASS:
54.07 and 54.13, for determining viscosity by measuring the rate of fluid flow.
61.64 for measuring settling or filtering ability of a constituent of a liquid mixture by measuring the rate of fluid flow.
61.73 for making a determination of solid components of a liquid by measuring the rate of fluid flow.
152.21 for measuring the rate of flow of a fluid in a borehole while drilling.
170.07 and 170.11+, for fluid flow direction determination not in a borehole or in a drilling study.
861 for measuring a rate of fluid flow measuring, per se.

SEE OR SEARCH CLASS:
116, Signals and Indicators, 112 for a mechanical alarm producing a humanly perceptible signal in response to a predetermined rate of fluid flow in a borehole, a casing, or a drill rigging and combined with no measuring means, and subclasses 264+ for a mechanical indicator structure, per se, of the presence or the absence of fluid flow in a borehole, a
casing, or a drill rigging.
175, Boring or Penetrating the Earth, subclass 48 for measurement of or indication of rate of flow of drilling fluid combined with more than a mere boring step or details of a boring apparatus.
340, Communications: Electrical, 608 for an electrical indicator or alarm providing a humanly perceptible signal in response to a predetermined rate of fluid flow in a borehole, a casing, or a drill rigging and not providing a quantitative measurement.
364, Electrical Computers and Data Processing Systems, subclass 422 for application of an electrical computer or data processing to a determination of a rate of fluid flow in a borehole, a casing, or a drill rigging when significant electrical computer or data processing detail and no more than a nominal transducer detail are recited, and subclass 510 for application of an electrical computer or data processing to a determination of rate of fluid flow in a borehole, a casing, or a drill rigging, per se, when significant electrical computer or data processing detail and nominally recited sensor are claimed.

Plural diverse measuring:
This subclass is indented under subclass 152.29. Subject matter combined with an apparatus or a process for making a test in addition to a test for the rate of fluid flow.

SEE OR SEARCH THIS CLASS, SUBCLASS:
198 for fluid rate of flow measuring, per se, combined with other measuring not used in a well bore or drilling study.

Vibration:
This subclass is indented under subclass 152.29. Subject matter wherein the determination of the physical characteristic of the borehole, the casing, or the drill rigging is made by measuring the effect of the rate of fluid flow on vibration.

SEE OR SEARCH THIS CLASS, SUBCLASS:
152.15 for determining a formation logging by plural types of tests including measuring radiation and vibration.
152.16 for determining a formation logging by plural types of tests including measuring vibration.
152.47 for making a downhole measurement of a characteristic of a borehole, a casing, or a drill rigging by measuring vibration during drilling.
152.57 for a cementing or casing test within a borehole using vibration.
152.58 for determining a physical condition of a borehole, a casing, or a drill rigging by making a measurement of vibration by an instrument located within the borehole.
570 for measuring and testing, per se, by use of vibration.
861.18 for measuring a volume or rate of fluid flow, per se, by measuring vibration.

SEE OR SEARCH CLASS:
367, Communications, Electrical: Acoustic Wave Systems and Devices, 25 for the communication of information or intelligence in the form of acoustic waves traveling through earth and detected by electric signal handling means passing through a well bore and providing information pertaining to a characteristic or a location of discontinuities within the earth, subclasses 81+ for the communication of information or intelligence traveling in a well bore in the form of acoustic waves traveling in a medium in the well bore different from the surrounding earth and providing information pertaining to a characteristic or a location of discontinuities within the earth, and subclasses 86+ for the communication of information or intelligence in the form of acoustic waves traveling through earth detected by electric signal handling means passing through a well bore and providing information pertaining to a characteristic of a well bore or a location of discontinuities within the earth for electroacoustic borehole testing and wherein the intelligence pertains to the walls of the borehole and is obtained from a device which travels through the passageway and emits acoustic waves into a medium contained within the borehole (e.g., water, air, etc.) which are reflected from the walls back to the device and are detected.

Thermal:
This subclass is indented under subclass 152.29. Subject matter wherein the determination of the physical characteristic of the borehole, the casing, or the drill rigging is made by measuring an effect of the rate of flow fluid upon temperature.

SEE OR SEARCH THIS CLASS, SUBCLASS:
170.12 for thermal measurement of fluid flow direction or of fluid flow velocity.
202.5 for thermal sensing of a fluid flow in a proportional flow meter.
204.11 for a thermal measurement of fluid flow, per se.
861.95 for fluid flow determination by measuring transit time of a thermal tracer or tag.

SEE OR SEARCH CLASS:
374, Thermal Measuring and Testing, appropriate subclass for measuring and testing the thermal effect, per se, of a fluid, particularly 29 for heat flow measurement and subclasses 43+ for heat coefficient measuring.

Rotary:
This subclass is indented under subclass 152.29. Subject matter which includes an element rotatable about an axis due to the flow of the fluid and the determination of the characteristic of the borehole, the casing, or the drill rigging is made by measuring the rate of rotation of the rotary element.

SEE OR SEARCH THIS CLASS, SUBCLASS:
861.33 for a device wherein the rotation rate of an element rotated by a flow of a fluid is used to measure swirl rate of a fluid flow.
861.77 for a meter for measuring a rate of fluid flow including an element rotated by a flow of a fluid and having an electrical circuit and wherein specific details of the circuit are included.
861.79 for measuring rate of fluid flow, per se, by use of an element rotated by a flow of a fluid whose rate is being measured.

Magnetic:
This subclass is indented under subclass 152.34. Subject matter wherein motion of the rotary element is detected by sensing magnetic properties or wherein the apparatus includes
means having magnetic properties.

Packer or deflector detail:
This subclass is indented under subclass 152.29. Subject matter including either (a) a means for constraining a stream of the fluid flow to or from a certain stratum and wherein significance is attributed to the constraining means or (b) means for constraining the fluid to flow within a certain flow path within the borehole and wherein significance is attributed to the constraining means.

SEE OR SEARCH CLASS:
166, Wells, 118, 142+, and 179 for a packer for fluid handling in a well.

Steady state fluid flow interruption:
This subclass is indented under subclass 152.18. Subject matter wherein the fluid usually flows at a constant rate and the determination of the characteristic of the borehole, the casing, or the drill rigging is made by interrupting the constant rate of flow of the fluid.

SEE OR SEARCH CLASS:
138, Pipes and Tubular Conduits, 40 for flow restrictors, per se.
166, Wells, subclass 91.1 for flow restrictors in an aboveground apparatus for a well and subclass 373 for a process of operating a valve, closure, or changeable restrictor in a well.

Drawdown or shutin test:
This subclass is indented under subclass 152.37. Subject matter wherein a determination of the characteristic of the borehole, the casing, or the drill rigging is made by decreasing a liquid level or completely stopping the flow of the fluid as by the closing of a valve.

SEE OR SEARCH CLASS:
138, Pipes and Tubular Conduits, 40 for flow restrictors, per se.
166, Wells, subclass 92.1 for well caps or heads, subclasses 95.1 and 97.1 for valves in the well head, and subclasses 316+ and the notes thereunder for valves or restrictors, per se, for a well or well apparatus.
251, Valves and Valve Actuation, appropriate subclass for a valve, per se.

Fluid injection into formation:
This subclass is indented under subclass 152.18. Subject matter wherein the determination of the characteristic of the borehole, the casing, or the drill rigging is made by forcing the fluid into the formation.

SEE OR SEARCH CLASS:
166, Wells, appropriate subclass for fluid injection into a formation of a well and especially 252.1 for well testing by the injection of fluids into the earth in order to produce other fluids.
405, Hydraulic and Earth Engineering, 263 for injection of chemicals into the earth.

Determining permeability or saturation:
This subclass is indented under subclass 152.39. Subject matter wherein the determination of the characteristic of the borehole, the casing, or the drill rigging is made by measuring either (a) a quality of either a bulk formation of a borehole or of selected constituents of a formation of a borehole to be penetrated by a liquid or a gas passing through pores or openings therein or (b) the maximum impregnation by gas, water, or oil of a bulk formation of a borehole or of selected constituents of a formation.

SEE OR SEARCH THIS CLASS, SUBCLASS:
38 for measuring permeability by use of fluid pressure.
73 for measuring the moisture content or absorption characteristic of a material.
152.05 for determination of a formation logging by measuring permeability.
152.06 for determination of a characteristic of a borehole by formation logging involving measuring permeability and oil, gas, or water saturation.
152.08 for determination of a formation logging by measuring oil, gas, or water saturation.

Determining relative proportion of fluid constituent:
This subclass is indented under subclass 152.18. Subject matter wherein the determination of the physical characteristic of the borehole, the casing, or the drill rigging is made by measuring the amount of a constituent of a fluid within the borehole or a ratio of one constituent of a fluid to another constituent of the fluid.

SEE OR SEARCH THIS CLASS, SUBCLASS:
19.09 for measuring the gas content of drilling mud.
61.43 for liquid analysis for a liquid constituent of a liquid mixture.
863.21 for the separation of constituents of a liquid sample not in a well.

SEE OR SEARCH CLASS:
210, Liquid Purification or Separation, appropriate subclass for the separation of liquid constituents of a mixture.

During drilling:
This subclass is indented under subclass 152.01. Subject matter wherein the determination of the physical characteristic of the borehole, the casing, or the drill rigging is made during the formation of or the enlargement of an elongated hole in the earth in situ by dislocating a solid material of the earth.

SEE OR SEARCH THIS CLASS, SUBCLASS:
7 for wear testing, per se.
104 for surface testing, per se.
152.03 for formation logging during a drilling operation.
152.19 for a determination of fluid flow during drilling.

SEE OR SEARCH CLASS:
175, Boring or Penetrating the Earth, subclass 39 for bit wear signal generating, subclasses 40+ for a process or an apparatus for boring into the earth combined with a measuring or an indicating feature wherein more than a mere step of boring is claimed.
250, Radiant Energy, subclass 254 for an apparatus or a method for making a geological test using radiant energy wherein drilling is involved.
324, Electricity: Measuring and Testing, 324 for a purely electrical measurement of a borehole fluid, subclass 356 for measuring an electrical property in a borehole while drilling, subclass 369 for well logging while drilling wherein an electrical property of an earth formation is measured, and subclass 694 for measuring resistance or conductance in order to determine water content.
356, Optics: Measuring and Testing, appropriate subclass for an apparatus or a method for testing drilling mud by measuring visible light.

Drill depth rate:
This subclass is indented under subclass 152.43. Subject matter wherein the drill rigging includes a drill and the determination of the physical characteristic of the borehole, the casing, or the drill rigging is made by either (a) measuring the rate at which the drill cuts through the formation, or (b) periodically measuring the depth of the drill which is utilized to compute the rate at which the drill cuts through the formation.
(1) Note. The identity of the formation can be readily ascertained from the relative ease with which the drill penetrates the formation.
(2) Note. The measurement of the drill depth rate is usually recorded by automatic means.

SEE OR SEARCH THIS CLASS, SUBCLASS:
152.03 for formation logging while drilling.

SEE OR SEARCH CLASS:
33, Geometrical Instruments, 700 for distance measuring. Note particularly indented subclasses 713+ for sounding-type measuring devices.
175, Boring or Penetrating the Earth, subclass 39 for measuring bit wear and subclass 50 for indicating testing or measuring a condition of a formation in the earth's surface while drilling when more than a mere step in boring is recited or drill structure is recited.
346, Recorders, appropriate subclasses for a recorder for recording the operation of machines and in particular 33 for a recorder combined with external recorder operating means including a well logging device and subclasses 112+ for a graph-type recorder.
368, Horology: Time Measuring Systems or Devices, 89 for time interval measuring, per se.

Electronic processing or electronic recording:
This subclass is indented under subclass 152.44. Subject matter including either a device which works by the emission, the behavior, or the effect of electrons and wherein the device either (a) operates on data pertaining to the determination of the characteristic of the borehole, the casing, or the drill rigging, or (b) makes a permanent record of the determination of the characteristic of the borehole, the casing, or the drill rigging.

SEE OR SEARCH THIS CLASS, SUBCLASS:
152.53 for an apparatus for making a determination of a characteristic of a borehole, a casing, or a drill rigging by measuring pressure combined with means for recording the determination being made.
152.62 for an apparatus for making a determination of a characteristic of a pump especially adapted for use of a borehole or a drill rigging and including a device for making a record of the determination of the characteristic of the pump.

SEE OR SEARCH CLASS:
346, Recorders, appropriate subclass for a recorder for recording the operation of machines and particularly 33 for a recorder combined with external recorder operating means including a well logging means and subclasses 112+ for a graph-type recorder.
360, Dynamic Magnetic Information Storage or Retrieval, appropriate subclass for magnetic storage and retrieval of arbitrarily variable information which is retained in a storage medium by variation of a physical characteristic thereof and wherein relative movement between a storage
element and a source of information, a transducer, or a receiver is required.
364, Electrical Computers and Data Processing Systems, subclass 422 for an application of electrical computers and data processing to well logging wherein detail of the computer or the data processing system combined with only nominally recited sensor are recited.
365, Static Information Storage and Retrieval, appropriate subclass for a recording apparatus not requiring relative movement between a storage element and a source of information, a transducer, or a receiver.
369, Dynamic Information Storage or Retrieval, appropriate subclass for a process of or an apparatus for the storage and retrieval of arbitrarily variable information which is retained in a storage medium by variation of a physical characteristic thereof and wherein relative movement between a storage element and a source of information, a transducer, or a receiver is required.

Downhole measurement:
This subclass is indented under subclass 152.43. Subject matter wherein the apparatus for the determination of the physical characteristic of the borehole, the casing, or the drill rigging is located within the borehole while the measurement is being made.

SEE OR SEARCH THIS CLASS, SUBCLASS:
152.28 for downhole fluid flow measuring combined with sampling.
152.54 for downhole measuring in a borehole while no drilling is taking place.

SEE OR SEARCH CLASS:
175, Boring or Penetrating the Earth, subclass 45 for a downhole measuring when more than a nominal recitation of a drilling process or structure is recited.

Vibration:
This subclass is indented under subclass 152.46. Subject matter wherein the determination of the physical characteristic of the borehole, the casing, or the drill
rigging is made by measuring vibration.

SEE OR SEARCH THIS CLASS, SUBCLASS:
570 for measuring and testing, per se, by use of vibration.
152.15 for determining a formation logging by plural tests including measurements of radiation and vibration.
152.16 for determining a formation logging by plural tests including a measurement of vibration.
152.32 for determining a rate of fluid flow within a borehole by measuring the effect of the rate of fluid flow on vibration.
152.57 for a vibration test of cement or a casing within a borehole.
152.58 for determining a characteristic of a borehole, a casing, or a drill rigging by measuring vibration by a device located inside a borehole.

SEE OR SEARCH CLASS:
181, Acoustics, 119 for a seismic wave generation means coupled to a fluid.
367, Communications, Electrical: Acoustic Wave Systems and Devices, 25 for the communication of information or intelligence in the form of acoustic waves traveling through earth and detected by electric signal handling means passing through a well bore and providing information pertaining to a characteristic or a location of discontinuities within the earth, subclasses 81+ for the communication of information or intelligence in the well bore in the form of acoustic waves traveling in a medium in the well bore different from the surrounding earth and providing information pertaining to a characteristic of the well bore or a location of discontinuities within the earth, and subclasses 86+ for the communication of information or intelligence in the form of acoustic waves traveling through earth and detected by electric signal handling means (a) passing through a well bore and (b) providing information pertaining to a characteristic of a borehole or a location of discontinuities within the earth for electroacoustic borehole testing and wherein the intelligence pertains to the walls of the borehole and is obtained from a device which travels through the passageway and emits acoustic waves into a medium contained within the borehole (e.g., water, air, etc.) which are reflected from the walls back to the device and are detected.

Force:
This subclass is indented under subclass 152.46. Subject matter wherein the determination of the physical characteristic of the borehole, the casing, or the drill rigging is made by measuring an agency or an influence that if applied to a free body results chiefly in acceleration of the body and sometimes in elastic deformation.

SEE OR SEARCH THIS CLASS, SUBCLASS:
152.49 for a measurement of force to determine a physical condition of a borehole, a casing, or a drill rigging while drilling.
152.59 for the downhole measurement of force to determine a physical condition of a borehole, a casing, or a drill rigging.
760 for stress or strain measuring or testing by stress or strain.
862 for force measuring, per se.

Force:
This subclass is indented under subclass 152.43. Subject matter wherein the determination of the physical characteristic of the borehole, the casing, or the drill rigging is made by measuring an agency or an influence that if applied to a free body results chiefly in acceleration of the body and sometimes in elastic deformation.

SEE OR SEARCH THIS CLASS, SUBCLASS:
152.48 for a downhole measurement of force to determine a physical characteristic of a borehole, a casing, or a drill rigging during drilling.
152.59 for the downhole measurement of force to determine a physical characteristic of a borehole, a casing, or a drill rigging.
760 for stress or strain measuring or testing by stress or strain.
862 for force measuring, per se.

Pressure measurement:
This subclass is indented under subclass 152.01. Subject matter wherein the determination of the physical characteristic of the borehole, the casing, or the drill rigging is made by measuring pressure.

SEE OR SEARCH THIS CLASS, SUBCLASS:
37 for performing a test by use of fluid pressure.
152.22 for determination of fluid flow during drilling by measuring pressure.
152.27 for a determination of fluid flow by measuring pressure combined with sampling.
152.55 for a downhole fluid test.
700 for fluid pressure measuring, per se.
760 for stress or strain measuring or testing by stress or strain.
862 for force measuring, per se.

SEE OR SEARCH CLASS:
116, Signals and Indicators, 112 for a pressure responsive mechanical alarm, per se, providing a humanly perceptible signal in response to a predetermined fluid flow, and subclass 266 for a pressure responsive mechanical indicator which provides a humanly perceptible signal in response to the presence or the absence of fluid flow.
166, Wells, subclass 64, 66, and 113 for detail of a well combined with determining fluid flow by measuring or detecting pressure wherein more structure than is necessary to perfect the test is recited.
175, Boring or Penetrating the Earth, 40 for a process or means of determining fluid flow by measuring or detecting pressure combined with more than a nominal recitation of an earth boring process or apparatus.
340, Communications: Electrical, subclass 611 for an electrical indicator or an electrical alarm which provides a humanly perceptible signal in response to a predetermined fluid flow via monitoring pressure and subclass 626 for an electrical indicator or alarm, per se, which provides a humanly perceptible signal in response to the detection of a predetermined pressure.
364, Electrical Computers and Data Processing Systems, 420 for the application of an electrical computer or data processing to the determination of fluid flow in a borehole by measuring pressure wherein significant electrical computer or data processing detail combined with only nominally
recited sensor structure are claimed.

Plural diverse measurements:
This subclass is indented under subclass 152.51. Subject matter including a process or an apparatus for determining a characteristic of a borehole, a casing, or a drill rigging by measuring a property other than a pressure.

With recorder:
This subclass is indented under subclass 152.51. Subject matter combined with a means for keeping a permanent record of the characteristic of the borehole, the casing, or the drill rigging.

SEE OR SEARCH THIS CLASS, SUBCLASS:
152.45 for an apparatus for making a determination of a characteristic of a borehole, a casing, or a drill rigging combined with an electronic recording means for making a permanent record of the determination.
152.62 for an apparatus for making a determination of a characteristic of a pump especially adapted for use in a borehole or a drill rigging and including means for making a record of the determination of the characteristic of the pump.

SEE OR SEARCH CLASS:
346, Recorders, appropriate subclasses for a recorder for recording the operation of machines, particularly 33 for a recorder combined with external recorder operating means including well logging and subclasses 112+ for graph-type recorders.
360, Dynamic Magnetic Information Storage or Retrieval, for magnetic storage and retrieval of arbitrarily variable information which is retained in a storage medium by variation of a physical characteristic thereof and wherein relative movement between a storage element and a source of information, a transducer, or a receiver is required.
365, Static Information Storage and Retrieval, for a recording apparatus not requiring relative movement between a storage element and a source of information, a transducer, or a receiver.
369, Dynamic Information Storage or Retrieval, appropriate subclass for a process of or an apparatus for the storage and retrieval of arbitrarily variable information which is retained in a storage medium by variation of a physical characteristic thereof and wherein relative movement between a storage element and a source of information, a transducer, or a receiver is required.

Downhole test:
This subclass is indented under subclass 152.01. Subject matter wherein the apparatus for determination of the physical characteristic of the borehole, the casing, or the drill rigging is located within the borehole while the measurement is being made.

SEE OR SEARCH THIS CLASS, SUBCLASS:
152.28 for sampling and downhole fluid flow measuring in a borehole while not drilling.
152.46 for downhole measuring (a) involving no fluid flow measuring and (b) taking place while drilling is being done.

Fluid test:
This subclass is indented under subclass 152.54. Subject matter wherein the determination of the physical characteristic of the borehole, the casing, or the drill rigging is made by measuring a property of a liquid, a gas, or a suspension of a solid in a liquid or a gas.

SEE OR SEARCH THIS CLASS, SUBCLASS:
19.01 for measuring the gas content of a liquid or a solid, per se.
28.01 for measuring the solid content of a gas, per se.
73 for measuring the moisture content of a material, per se.
152.28 for sampling and downhole fluid flow measuring in a borehole while drilling is not taking place.
290 for measuring liquid level, per se.

SEE OR SEARCH CLASS:
324, Electricity: Measuring and Testing, subclass 204 for testing magnetic fluid material, subclasses 425+ for measuring electrolytic properties of a fluid, and subclasses 600+ for measuring a property of a fluid material by measuring an impedance or an impedance- related quantity.
422, Chemical Apparatus and Process Disinfecting, Deodorizing, Preserving, or Sterilizing, 68.1 for fluid analysis involving a chemical reaction.
436, Chemistry: Analytical and Immunological Testing, 25 for chemical testing of fluids within a borehole, especially subclasses 29+ for petroleum oils or carbonaceous minerals and subclass 30 for testing drilling mud.

Free point or stuck point:
This subclass is indented under subclass 152.54. Subject matter wherein the determination of the physical characteristic of the borehole, the casing, or the drill rigging is made by measuring or detecting the point or points at which a drill pipe, casing, or tubing is stuck in a borehole traversing an earth formation.

SEE OR SEARCH CLASS:
33, Geometrical Instruments, appropriate subclass for a determination of positions in a well bore, per se, and subclass 302 and 304+ for well bore configuration determining, per se.
166, Wells, subclass 255.1 for a comprehensive process wherein a determination of a position of unintentional motionlessness of a drill pipe, casing, or tubing within a borehole wherein more well detail than is necessary for perfecting the test is claimed.
340, Communications: Electrical, subclass 854.2 for well bore telemetry wherein a location of a stuck tool is recorded.

Casing or cementing:
This subclass is indented under subclass 152.54. Subject matter including (a) a pipe which lines all of or a portion of a wall of the borehole or (b) a cementing of a lining in the borehole and wherein the determination of the characteristic of the borehole is made by measuring a property of the lining or the cementing.

SEE OR SEARCH THIS CLASS, SUBCLASS:
152.15 for a formation logging apparatus or process for determining a characteristic of the borehole by measuring the effect of cement within a borehole on vibration combined with measuring radioactivity.
152.16 for well logging including plural types of tests including making a determination of a characteristic of a casing by measuring an effect of the casing on vibration and not combined with radioactivity measuring.

SEE OR SEARCH CLASS:
166, Wells, subclass 253.1 for a comprehensive process relating to wells which includes indicating the location, the presence, or the absence of cement wherein more well detail is recited than that which is necessary to perfect the test.
250, Radiant Energy, subclass 257 for a well testing apparatus and method utilizing measurement of radioactivity combined with detection of a casing collar.
340, Communications: Electrical, subclass 854.5 for well bore telemetry wherein either downhole equipment or a transmission link is described to electrically conduct or process information signals which are transmitted through a casing of a borehole to a location above the borehole.
367, Communications, Electrical: Acoustic Wave Systems and Devices, 35 for the communication of information or intelligence in the form of acoustic waves traveling in the earth which are detected by means which travels through a borehole means generating an electric signal which represents the communicated information or intelligence and wherein the information or intelligence pertains to the borehole itself or to a lining of the borehole.

Using vibration:
This subclass is indented under subclass 152.54. Subject matter wherein the determination of the characteristic of the borehole, the casing, or the drill rigging is made by measuring the effect of the borehole casing or the drill rigging on vibration.

SEE OR SEARCH THIS CLASS, SUBCLASS:
152.15 for determining a formation logging by plural tests including measurements of radioactivity and vibration.
152.16 for determining a formation logging by plural tests
including a measurement of vibration and no measurement of radioactivity.
152.32 for determining a rate of fluid flow within a borehole by measuring the effect of the rate of fluid flow on vibration.
152.47 for making a downhole measurement of a characteristic of a borehole, a casing, or a drill rigging by measuring vibration during drilling.
152.57 for a downhole vibration test of cement or a casing within a borehole.
570 for measuring and testing, per se, by use of vibration.

SEE OR SEARCH CLASS:
181, Acoustics, for acoustic exploration within a borehole.
367, Communications, Electrical: Acoustic Wave Systems and Devices, 25 for the communication of information or intelligence in the form of acoustic waves traveling through earth and detected by electric signal handling means passing through a well bore and providing information pertaining to a characteristic or a location of discontinuities within the earth, subclasses 81+ for the communication of information or intelligence in a well bore in the form of acoustic waves traveling in a medium in the well bore different from the surrounding earth and providing information pertaining to a characteristic of the well bore or a location of discontinuities within the earth, and subclasses 86+ for the communication of information or intelligence in the form of acoustic waves traveling through earth and detected by electric signal handling means (a) passing through a well bore and (b) providing information pertaining to a characteristic of a borehole or a location of discontinuities within the earth for electroacoustic borehole testing and wherein the intelligence pertains to the walls of the borehole and is obtained from a device which travels through the passageway and emits acoustic waves into a medium contained within the borehole (e.g., water, air, etc.) which are reflected from the walls back to the device and are detected.

By measurement of response due to force:
This subclass is indented under subclass 152.54. Subject matter wherein the determination of the physical characteristic of the borehole, the casing, or the drill rigging is made by measuring a response due to an agency or an influence that if applied to a free body results chiefly in acceleration of the body and sometimes in elastic
deformation.

SEE OR SEARCH THIS CLASS, SUBCLASS:
152.48 for a measurement of force to determine a physical condition of a borehole, a casing, or a drill rigging by use of an apparatus located within a borehole and during the time that drilling is taking place.
152.49 for a measurement of force to determine a physical condition of a borehole, a casing, or a drill rigging while drilling.
862 for a force measuring apparatus, per se.

Pump test:
This subclass is indented under subclass 152.01. Subject matter comprising an apparatus or a method for determining a physical characteristic of a pump used (a) for circulating a fluid in a borehole or (b) for circulating a fluid in a drilling operation.

SEE OR SEARCH THIS CLASS, SUBCLASS:
168 for a process or an apparatus for making a determination of a characteristic of a pump.

SEE OR SEARCH CLASS:
166, Wells, subclass 54.1 for means separately pumping from plural sources within a well, subclasses 62, 68+, and 105+ for an eduction pump within a well, and subclass 101 for a pump for a well wherein the pump exerts an outward pressure.
417, Pumps, appropriate subclass for a pump inserted in a well, per se.

With recorder:
This subclass is indented under subclass 152.61. Subject matter combined with a means for keeping a permanent record of the determination of the physical characteristic of the borehole, the casing, or a drill rigging.

SEE OR SEARCH THIS CLASS, SUBCLASS:
152.45 for an apparatus for testing a borehole or drilling combined with means for making an electronic recording of a
drill depth rate during drilling.
152.53 for an apparatus for testing a borehole or drilling by measuring pressure combined with means for making a record of the test.

SEE OR SEARCH CLASS:
346, Recorders, appropriate subclasses, for a recorder for recording the operation of machines, particularly 33 for recorders combined with external recorder operating means including a well logging apparatus and subclasses 112+ for graph-type recorders.
360, Dynamic Magnetic Information Storage or Retrieval, for magnetic storage and retrieval of arbitrarily variable information which is retained in a storage medium by variation of a physical characteristic thereof and wherein relative movement between a storage element and a source of information, a transducer, or a receiver is required.
365, Static Information Storage and Retrieval, for a recording apparatus not requiring relative movement between a storage element and a source of information, a transducer, or a receiver.
369, Dynamic Information Storage or Retrieval, appropriate subclass for a process of or an apparatus for the storage and retrieval of arbitrarily variable information which is retained in a storage medium by variation of a physical characteristic thereof and wherein relative movement between a storage element and a source of information, a transducer, or a receiver is required.

This subclass is indented under the class definition. Subject matter directed to the verification of statistical record data, either perforations or markings, against a master record or keyboard setting.

SEE OR SEARCH THIS CLASS, SUBCLASS:
37 for determination of the presence of perforations in sheet or other material without regard to location by using fluid under pressure (positive or negative).
157 for similar verification of sprocket apertures in picture films and record strips.
159 for sensing perforations in sheet material without regard to location therein.

SEE OR SEARCH CLASS:
234, Selective Cutting (e.g., Punching), subclass 34 for a selective punching machine provided with verification means.
235, Registers, subclass 431, for calculators that compare two or more sets of data carried upon record cards, etc., and subclasses 439+ for mechanisms for sensing or analyzing data on a record, and see the search notes to such subclasses.

This subclass is indented under the class definition. Subject matter for verifying the sprocket apertures of picture films and record strips.

SEE OR SEARCH THIS CLASS, SUBCLASS:
156 for verifying statistical card records and see the notes thereto.

This subclass is indented under the class definition. Subject matter for the testing of hoisting cables and ropes, as for testing centers, twist counting, etc.

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760 particularly subclasses 828+ for stress and strain tests.

This subclass is indented under the class definition. Subject matter for testing or inspecting sheet material, woven fabric materials, and fibers.

SEE OR SEARCH THIS CLASS, SUBCLASS:
7 for "wear" tests.
37 for tests using fluid under pressure (positive or negative) as in determining porosity.
73 for moisture content or absorption characteristics tests.
150 for fade of dyes and other coating materials caused by fabrics, sheet material, etc.
788 for stress and strain test including tear flexing, bending, folding, bursting or rupture tests.

SEE OR SEARCH CLASS:
26, Textiles: Cloth Finishing, subclass 70 for cloth inspecting.
356, Optics: Measuring and Testing,238.1 for the inspection of cloth for flaws.

This subclass is indented under subclass 159. Subject matter for testing or inspecting of filaments or strands, for defects, etc.

SEE OR SEARCH THIS CLASS, SUBCLASS:
828 for tensile testing of a strand.
849 for testing by bending, flexing, or folding.

SEE OR SEARCH CLASS:
28, Textiles: Manufacturing, 226, for detecting knots or slubs in threads.

This subclass is indented under the class definition. Subject matter involving special adoption to the testing of coil and leaf springs.

SEE OR SEARCH THIS CLASS, SUBCLASS:
808 for fatigue tests.
818 for compression tests.
849 for flexure tests.

This subclass is indented under the class definition. Subject matter directed to the testing of toothed gears of all sorts for noise, strength, wear, etc.

SEE OR SEARCH CLASS:
33, Geometrical Instruments, subclass 179.5 for gauges for determining the form of spur gearing, hobs or spur gear cutters.

This subclass is indented under the class definition. Subject matter directed to the testing of coins.

SEE OR SEARCH CLASS:
177, Weighing Scales, subclass 51 for a device for testing the size and weight of a coin.
194, Check-Actuated Control Mechanisms, 302 for fraud preventing devices of the type associated with coin controlled apparatus which involve coin testing features, e.g., by testing for size, material or weight.
324, Electricity: Measuring and Testing, appropriate subclasses for testing electrical properties of articles including coins.
453, Coin Handling, 3, for coin assorters that separate coins according to size.

This subclass is indented under the class definition. Subject matter directed to the testing of miners' lamps.

SEE OR SEARCH THIS CLASS, SUBCLASS:
36 for testing illuminating fluids.

This subclass is indented under the class definition. Subject matter for testing of ordnance and projectiles.

SEE OR SEARCH THIS CLASS, SUBCLASS:
11.04 for testing gun recoil apparatus.
35.14 for study of explosives and explosive pressures.
78 for hardness tests.
760 for stress and strain tests.

SEE OR SEARCH CLASS:
273, Amusement Devices: Games, subclass 404 for bullet traps combined with targets; and subclass 410, for bullet traps used with targets.

This subclass is indented under the class definition. Subject matter for testing hydraulic equipment, blowers and pumps.

SEE OR SEARCH THIS CLASS, SUBCLASS:
37 for testing by fluid pressure.
112 and 116+, for power plant or unit efficiency and motor or engine testing.
147 for propeller study.

This subclass is indented under the class definition. Subject matter for determining the physical characteristics of dough, bread and flour.

SEE OR SEARCH CLASS:
23, Chemistry: Physical Processes, subclass 20 for determination of pressures evolved in fermentation of dough.
426, Food or Edible Material: Processes, Compositions, and
Products, 231 for process of food treating combined with testing or measuring.

FLUID FLOW DIRECTION (E.G., WIND SOCK, WEATHER VANE, ETC.):
This subclass is indented under the class definition. Subject matter comprising an apparatus or method for determining the direction of flow of fluid.

SEE OR SEARCH THIS CLASS, SUBCLASS:
170.16 for meteorological measuring not combined with direction determining.
170.29 for oceanos:graphic measuring not combined with direction determining.
861 for the measurement of a rate of fluid flow, per se; especially, subclass 861.85 for an anemometer, per se.

SEE OR SEARCH CLASS:
40, Card, Picture, or Sign Exhibiting, 412, 422, 439+, and 477+ for a device of that class operated by fluid.
116, Signals and Indicators, 273 for mechanical indicators of the presence or absence of fluid flow, as through a pipe, and subclasses 173+ for flags.
446, Amusement Devices: Toys, 199 for a fluid operated changing or moving figure or figure part.

Relative to aircraft or watercraft:
This subclass is indented under subclass 170.01. Subject matter comprising a process or an apparatus for determining the direction of flow of fluid relative to an aircraft or watercraft.

Sailboat (e.g., sailing aid):
This subclass is indented under subclass 170.02. Subject matter wherein the watercraft is a sailboat.

SEE OR SEARCH CLASS:
40, Card, Picture, or Sign Exhibiting, 412, 422, 439+, and 477 for fluid operated display devices.
116, Signals and Indicators, 273 for mechanical indicator of the presence or absence of fluid flow, as through a pipe, and subclasses 173+ for flags.

Using a drifter or tracer (e.g., smoke):
This subclass is indented under subclass 170.01. Subject matter wherein the determination is made by detecting a body or a substance introduced into and carried by the fluid.

SEE OR SEARCH THIS CLASS, SUBCLASS:
861.05 861.07, for using a tracer or a tag for measuring the volume or rate of flow of a fluid, per se.

Using a fluid actuated alignment device (e.g., wind sock, weather vane, etc.):
This subclass is indented under subclass 170.01. Subject matter comprising a means responsive to the fluid flow which aligns itself in the direction of flow of the fluid.

With illumination means or an electro-optical indicator (e.g., beacon or signal lamp):
This subclass is indented under subclass 170.05. Subject matter combined with (a) means for illuminating the alignment device or (b) means responsive to electricity for indicating the fluid flow direction.

SEE OR SEARCH CLASS:
362, Illumination, for an illumination device, per se.

With velocity determination:
This subclass is indented under subclass 170.05. Subject
matter combined with means for determining the rate of flow of the fluid.

SEE OR SEARCH THIS CLASS, SUBCLASS:
170.11 for fluid flow direction determination combined with velocity determination.
861 for fluid flow determination, per se; especially, subclass 861.85 for an anemometer for measuring wind velocity.

SEE OR SEARCH CLASS:
446, Amusement Devices: Toys, 53 and 119+ for a changing or moving figure or figure part used as a toy.

Electric sensor:
This subclass is indented under subclass 170.07. Subject matter including means whose electron flow or electron storage characteristic changes in response to the determination being made.

SEE OR SEARCH THIS CLASS, SUBCLASS:
170.09 for fluid flow direction determination means not combined with velocity measuring but having an electric sensor which is responsive to fluid flow direction.
866.5 for a probe or probe mounting, per se.

SEE OR SEARCH CLASS:
250, Radiant Energy, appropriate sub-classes for a light responsive sensor, per se.
310, Electrical Generator or Motor Structure, 311 for a piezoelectric sensor, per se.
338, Electrical Resistors, 2 for a strain gauge resistor, per se, and subclasses 13+ for a condition responsive resistor, per se.
361, Electricity: Electrical Systems and Devices, 280 for a capacitor-type sensor, per se.

Electric sensor:
This subclass is indented under subclass 170.05. Subject matter including means whose electron flow or electron storage characteristic changes in response to the determination being made.

SEE OR SEARCH THIS CLASS, SUBCLASS:
170.08 for a fluid flow device using a fluid actuated alignment means combined with velocity measuring and having an electric sensor.
866.5 for a probe or probe mounting, per se.

SEE OR SEARCH CLASS:
250, Radiant Energy, appropriate sub-classes for a light responsive sensor, per se.
310, Electrical Generator or Motor Structure, 311 for a piezoelectric sensor, per se.
338, Electrical Resistors, 2 for a strain gauge resistor, per se, and subclasses 13+ for a condition responsive resistor, per se.
361, Electricity: Electrical Systems and Devices, 280 for a capacitor-type sensor, per se.

With velocity determination:
This subclass is indented under subclass 170.01. Subject matter including a process or an apparatus for determining the rate of flow of the fluid.

SEE OR SEARCH THIS CLASS, SUBCLASS:
170.07 for fluid flow direction determination using fluid actuated alignment combined with velocity determination means.
861 for fluid flow determination, per se; especially, subclass 861.85 for an anemometer for measuring wind velocity.

SEE OR SEARCH CLASS:
446, Amusement Devices: Toys, 53, 119+ for a changing or moving figure or figure part which is a toy.

Thermal:
This subclass is indented under subclass 170.11. Subject matter wherein the determination of the velocity or the direction of fluid flow is made by measuring or sensing a thermal effect caused by the flow of the fluid.
(1) Note. Such measurement often includes determination of the cooling effect upon a heated element.

SEE OR SEARCH THIS CLASS, SUBCLASS:
118.2 for measuring intake air flow in an internal combustion engine.
198 for fluid flow measuring combined with diverse subject matter.
202.5 for thermal sensing of flow including an auxiliary testing of a flow path.
204.11 for thermal sensing of flow rate.
861.95 for measuring by use of a thermal tracer or tag.

SEE OR SEARCH CLASS:
374, Thermal Measuring and Testing, appropriate subclasses for measuring and testing of a thermal effect, per se; particularly, 29 for heat flow measurement and subclasses 43+ for heat flow coefficient measuring.