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 [Search a list of Patent Appplications for class 340]   CLASS 340,COMMUNICATIONS: ELECTRICAL
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SECTION I - CLASS DEFINITION

This is the residual home for subject matter, not elsewhere classified, relating to communication by means which are in part or in whole electrical.

Communications is defined, for the purpose of this definition, as being the handling of information or intelligence and is not restricted to the conveying of said information or intelligence between geographically spaced points. (Thus, a traffic obstruction light which merely marks a safety island is a means for communicating information or intelligence, viz., the fact of the presence of the traffic island).

Information or intelligence is defined, for the purpose of this definition, as being the subject matter which is handled by signaling systems or signaling devices (such as telegraph systems) or by that portion of nonsignaling systems or nonsignaling devices (such as power supply systems) which is designated in the arts as having a control function (such as the supervisory circuits which control the circuit breakers of an electric power network).

Handling, as used above, is defined as being the active coaction between the tangible communication system or device and the intangible information or intelligence, and such coaction may assume various forms, such as transmission, storage, exhibiting, etc.

(1) Note. Since Class 340 takes, under the class definition, only those electrical communication systems which are not elsewhere classified, the search, in order to be complete, must, in appropriate instances, extend elsewhere. See Lines With Other Classes, below.
(2) Note. The combination of the subject matter of this class (340) and art environment is generally classified with the art environment where that environment is significant, either by virtue of a significant disclosed relationship or by virtue of a claimed relationship. Where the art environment is recited by name only, the combination may be classified, in some instances, with the art environment, and in others, in this class (340). For a list of some of the other classes which contain pertinent subject matter, see the classes referred to under SEARCH CLASS.
(3) Note. This classification was produced in 1952 by making official the unofficial digests which had been established by the Examiners of Division 42 during the period from about 1910 to about 1942. A caveat is given: While it is believed that the titles and definitions are reasonably correct, no assurance can be given that all of the patents, issued prior to the date of reclassification, are in the proper subclass, since the individual patents were not read during the reclassification project. Consequently, in making a thorough search in this class, it is advisable to investigate every subclass which may possibly be pertinent and not, in order to shorten the search, to rely on the principle of superiority of subclass subject matter because of position in schedule, since the principle is applicable only in classes where each patent has been analyzed and placed in the schedule in accordance with that portion of the disclosed subject matter which is claimed.

SECTION II - LINES WITH OTHER CLASSES AND WITHIN THIS CLASS

Since Class 340 takes, under the class definition, only those electrical communication systems which are not elsewhere classified, the search, in order to be complete, must, in appropriate instances, extend to Class 178, Class 246, Class 250, Class 332, Class 343, Class 346, Class 348, and Class 379. See References to Other Classes, below.

LINE BETWEEN CLASSES 116, 250, 340, AND 343

Class 250, Radiant Energy, for signaling systems of the radiant energy type. Such signaling systems are coextensively classified in Class 343, and the class definitions of these two classes should be consulted for the line between Classes 250 and 343, and the class definition of Class 343 for the line between Classes 343 and 116. Note that Class 340 provides for telemetering along a radiant energy beam and for signaling systems having a radiant energy responsive detector.

LINE BETWEEN CLASSES 342, 250, 340, AND 343

Class 342, Communications: Directive Radio Wave Systems and Devices (e.g., Radar, Radio Navigation) appropriate subclasses for signaling systems of the radio wave energy type. See the reference to Class 250, supra, for the lines between Classes 250, 340, and 343. See Class 343 for antennas with a signal, indicator, or alarm which is responsive to the scan, sweep, or orientation of the antenna; and for antennas with a signal, indicator, or alarm responsive to some other condition of the antenna. See subclass 700 of Class 343 for certain classification lines involving antennas and signals, indicators, and alarms.

SECTION III - SUBCLASS REFERENCES TO THE CURRENT CLASS

SEE OR SEARCH THIS CLASS, SUBCLASS:

901,through 996, The following conventions will apply to the definition of these subclasses: (a) A signal is an information-carrying wave; (b) A indicator is a device which makes information concerning a condition available. (c) An alarm is an indicator which makes information available only upon the occurrence of a preselected state of the condition.
289,320, for a significantly recited electric signaling system.
12.31,288, 533, and 538, for the combination of a Class 340 system and a Class 178 system.

SECTION IV - REFERENCES TO OTHER CLASSES

SEE OR SEARCH CLASS:

15Brushing, Scrubbing, and General Cleaning,   subclass 339 for brushing, scrubbing and general cleaning machines having a signal or indicator to indicate the condition of the machine or work.
34Drying and Gas or Vapor Contact With Solids,   subclass 89 for apparatus of that class combined with indicating or signaling means.
40Card, Picture, or Sign Exhibiting,   subclasses 463+ for electrically actuated changeable exhibitors, such as the advertising display type and subclasses 541+ for illuminated signs having significant sign structure in addition to electric illumination. Advertising display elements arranged in matrix are in class (345) subclasses 55+.
43Fishing, Trapping, and Vermin Destroying,   subclass 16 , 17, and 58 for the subject matter of that class combined with signals and indicators.
70Locks,   subclass 434 for locks combined with electric recorders for indicating the previous condition of the lock, and other appropriate subclasses for locks combined with electric signals.
73Measuring and Testing,   appropriate subclasses for testing devices which make a test of the Class 73 type (usually nonelectrical and nonchemical) and signal the result of said test by electrical means. Note particularly subclasses 23.2+ , 301, 304, 308, 313, 717+, 723+, 733+, and 753+.
81Tools,   subclass 479 for torque-responsive wrenches or screwdrivers having electrical means to indicate when a selected torque is exerted.
84Music,   subclass 405 for xylophones with electric action, subclass 407 for bell sets (carillons) with electric action and subclass 462 for electric devices responsive to playing of a musical instrument for recording the action of said instrument.
99Foods and Beverages: Apparatus,   subclass 285 for beverage infusers having signal means and subclasses 342+ for cookers having signal means.
100Presses,   subclass 99 for presses having electrical means to indicate the condition of the press or the material being pressed.
109Safes, Bank Protection, or a Related Device,   subclasses 38+ for safes and analogous structures having alarm devices for signaling loss of integrity.
114Ships,   subclass 246 for indicators for locating the position of a towed vessel with respect to the towing vessel.
116Signals and Indicators, see Lines With Other Classes and Within This Class,   in the class definition for the line between the electrical signals in Class 340 and the mechanical signals in Class 116. Search appropriate subclasses of Class 116 for mechanical signals and indicators analogous to the electrical signals and indicators of Class 340. Search subclass 20 for heliographic signaling along a light ray.
118Coating Apparatus,   subclasses 712+ for coating apparatus having a signal or indicator.
119Animal Husbandry,   subclasses 14.14+ for milkers having a signal or indicator.
134Cleaning and Liquid Contact With Solids,   subclass 113 for cleaning or wetting devices having signals or indicators.
137Fluid Handling,   subclasses 551+ for fluid handling equipment having signal or indicating means.
160Flexible or Portable Closure, Partition, or Panel,   subclass 10 for the subject matter of that class having signals or indicators.
169Fire Extinguishers,   subclasses 19+ for fire extinguishing systems having automatically opened valves and subclass 23 for fire extinguishing systems having alarms which indicate some abnormal condition of the fire extinguishing system. The nominal combination of a fire extinguishing system, recited nonsignificantly, as by name only, and a significantly recited electric signaling system is classified in appropriate subclasses of Class 340, (for which see Subclass References to the Current Class above)
174Electricity: Conductors and Insulators,   subclass 11 for fluid-insulated conductors having means to indicate the condition of the fluid.
177Weighing Scales,   subclasses 45+ for a weigher having an alarm or signal.
178Telegraphy,   appropriate subclasses for telegraphic signaling. See the class definition of Class 178 for the line between Classes 178 and 340. The combination of a Class 340 system and a Class 178 system is classified in Class 340 in appropriate subclasses, see Subclass References to the Current Class above.
181Acoustics,   subclasses 101+ for mechanical compressional wave devices and systems, such as those used in seismic prospecting, subclasses 123+, for mechanical sound echo systems, and subclass 125 for mechanical sound location apparatus and methods.
182Fire Escape, Ladder, or Scaffold,   subclass 18 for a fire escape, ladder, or scaffold having an indicator, signal or alarm.
185Motors: Spring, Weight, or Animal Powered,   subclass 14 , 36, and 44 for spring and weight motors having indicators to show the extent to which they are wound up or run down.
187Elevator, Industrial Lift Truck, or Stationary Lift for Vehicle,   appropriate subclasses for signalling means in combination or limited to use with elevator structure.
188Brakes,   appropriate subclasses for significantly claimed brakes or brake systems combined with signals.
194Check-Actuated Control Mechanisms,   subclasses 302+ for coin controlled mechanisms having a signal to indicate the condition (e.g., counterfeit coin) of the mechanism.
198Conveyors: Power-Driven,   subclass 40 for conveyors having signaling means.
200Electricity: Circuit Makers and Breakers,   subclass 308 for switches having indicators to indicate the position or condition of the switch.
215Bottles and Jars,   subclasses 365+ for receptacles having indicating means and subclasses 201+, 227, and 230 for closures having indicating means.
219Electric Heating,   subclass 109 for a current supply indicator (e.g., a recorder, etc.) to a metal heating (e.g., resistance heating, etc.) pressure bonding (e.g., resistance welding, etc.) apparatus, subclass 209 combined with a diverse-type electrical art device, subclass 248 for a heating device combined with a sole plate-type pressure application means (e.g., a flatiron, etc.) including a condition-responsive indicator, subclass 269 for an igniter-type resistive element indicating means, subclass 445.1 for an exposed planar support surface for material to be heated (e.g., hot plate, etc.) including an indicator, subclasses 446.1+ for an exposed planar support surface for material to be heated (e.g., hot plate, etc.) including a sensing means, subclass 487 for a heating device having a power supply and voltage or current regulation or current control means to control or regulate plural separate distinct heating resistance elements (i.e., one control system for all elements, etc.) selectively, sequentially, or alternately including indicator means, subclass 506 for a heating device having automatic regulating or control of power supply and voltage including signal or indicator means, subclass 667 for a condition responsive temperature load sensing power switching supply system for an inductive heating device, subclass 714 for a remote control system for a microwave heating device, subclass 719 for a timer control system for a microwave heating device, or subclass 720 where a control system for a microwave heating device has a display or alarm.
221Article Dispensing,   subclasses 2+ for article dispensers not otherwise classified having indicators or signals.
222Dispensing,   subclasses 23+ for fluent material dispensing means having indicators or signals.
232Deposit and Collection Receptacles,   subclasses 34 through 37for letter boxes having signals or indicators.
234Selective Cutting (e.g., Punching),   subclasses 4+ for a typographical punching machine provided with means to indicate approach to and entry into the justification zone; subclasses 13+ and 22+, for a selective cutting machine with automatic control usually initiated by an indicator or detector of a given operating condition; subclasses 59+, for a pattern-controlled selective cutting machine which may be electrically operated.
235Registers,   subclass 61 for mechanical calculators, subclasses 400+ for ordnance control data calculators, subclasses 419+ for electromechanical or mechanical record controlled calculators, subclasses 435+ for coded record sensors, and subclasses 487+ for coded records adapted to be read by machine.
241Solid Material Comminution or Disintegration,   subclass 101.01 for the subject matter of that class having signals and indicators.
242Winding, Tensioning, or Guiding,   subclass 357 , 472.0+, 479.9+, 484.8, 484.9+, 534+, 563+, and 912 for a detector, signal, or indicator associated with winding or unwinding an elongated material.
246Railway Switches and Signals,   for railway signaling and control systems. See the class definition of Class 246 for the line between Classes 246 and 340.
250Radiant Energy,   for signaling systems of the radiant energy type; subclasses 306+ for methods and apparatus for inspecting solids or liquids by charged particles, subclasses 330+ for the detection of infrared patterns and the conversion of the pattern into a light image, subclasses 336.1+ for methods and apparatus to detect and indicate the intensity or frequency of invisible radiation or the testing of materials by detecting and indicating the change in invisible radiation caused by the material, and subclasses 200 to 239 for photocell light-responsive circuits and apparatus. (See Lines With Other Classes and Within This Class)
258Railway Mail Delivery,   subclass 2 for the subject matter of that class (which includes delivery to and from airborne vehicles) having signaling features.
276Typesetting,   subclass 11 for typesetting machines having means for indicating the length of the line set.
291Track Sanders,   subclass 17 for track and vehicle sanding machines provided with alarms to indicate the operation thereof.
307Electrical Transmission or Interconnection Systems,   appropriate subclasses for the subject matter of that class having signals and indicators. Note that many of the systems of this class, while not having signals and indicators, have automatic controls which are analogous to signals.
312Supports: Cabinet Structure,   subclasses 234+ for cabinets having indicators.
313Electric Lamp and Discharge Devices,   subclass 10 for electric space discharge devices, such as vacuum tubes, or electric lamps having temperature indicators.
314Electric Lamp and Discharge Devices: Consumable Electrodes,   subclass 9 for electric arc lamps having a signal or indicator.
315Electric Lamp and Discharge Devices: Systems,   subclasses 129+ for electric gas discharge device systems or electric lamp systems having signals, indicators or alarms and subclasses 364+ for space discharge devices testing or lamp testing equipment having signals or indicators.
318Electricity: Motive Power Systems,   subclass 490 for electric motor systems having signals or indicators.
320Electricity: Battery or Capacitor Charging or Discharging,   appropriate subclass for a battery or capacitor charging or discharging circuit combined with an indicator.
322Electricity: Single Generator Systems,   subclass 99 for electric generator systems having signals or indicators.
324Electricity: Measuring and Testing,   appropriate subclasses for testing systems for making tests of electric properties having means to indicate the result of the test. Note subclasses 323+ for testing systems for locating ore bodies having means to indicate the result of the test, and subclasses 76.11+ for meters for measuring a property of an electric current or voltage or combination thereof (e.g., power factor, watt-hours, phase angle frequency). Telemetering systems which utilize a meter as a portion thereof are in Class 340 subclasses 870.02+, but the meter subcombination, per se, is classified with the meters of Class 324. Telemetering systems which, by significantly claimed structure or circuit, indicate the result of an electrical test at a point remote from the point of measurement are classified with the test in Class 324, as such telemetering systems are not of general utility, but are restricted to use in Class 324 measurements.
329Demodulators,   for demodulators of modulated intelligence including continuous waves (CW), and which furnish something more than the mere indication of the initiation of the signal.
331Oscillators,   appropriate subclasses, for electric oscillation generators of utility in the communication systems of Class 340. Class 331, subclass 64 for oscillator systems provided with an indicator, signal or alarm.
332Modulators,   subclass 118 and 150 for modulators having signals and indicators.
333Wave Transmission Lines and Networks,   for wave transmission systems wherein electromagnetic wave energy is guided or constrained by a propagation medium of appreciable electrical length as compared to the wavelength of the propagated energy. This class includes numerous networks and components useful in communications. Note particularly subclass 20 for wave-shaping networks of the passive type, subclasses 24+ for coupling networks including delay networks and filters, and subclasses 236+ for long lines having distributed electrical parameters, and subclasses 1+ for plural channel systems of these lines and networks.
336Inductor Devices,   subclass 45 for inductors having movable parts and means to indicate the position of the movable part.
338Electrical Resistors,   subclasses 13+ and 68+ for variable resistors including rheostats and potentiometers.
341Coded Data Generation or Conversion,   appropriate subclasses for code conversion, transmission or generation.
342Communications: Directive Radio Wave Systems and Devices (e.g., Radar,   Radio Navigation) appropriate subclasses for signaling systems of the radio wave energy type. (See Lines With This Class and Within Other Classes.)
345Computer Graphics Processing and Selective Visual Display Systems,   subclasses 1.1 through 3.4for plural display systems, and subclasses 418-475 for computer graphics processing.
346Recorders,   appropriate subclasses for signals or indicators which record, and subclass 16 and 17+ for recorders combined with signals and indicators.
348Television,   appropriate subclasses for television communication systems.
356Optics: Measuring and Testing,   for visible light type testing and examination instruments particularly for light radar devices in subclasses 3+ , subclasses 43+ for optical pyrometers, subclass 625 for measuring dimension, subclass 388 for configuration comparison devices, subclass 402 for shade or color test devices, subclasses 213+ for photometers, and subclasses 237.1+ for flaw and imperfection devices.
358Facsimile and Static Presentation Processing,   appropriate subclasses for data processing for static presentation to printer, and facsimile communication systems.
360Dynamic Magnetic Information Storage or Retrieval,   appropriate subclass for read/write dynamic storage systems.
362Illumination,   appropriate subclasses for illuminating means which may serve as signalling means.
365Static Information Storage and Retrieval,   appropriate subclass for read/write static storage systems, subclasses 185.01+ for floating gate memory storage (e.g., flash memory).
367Communications, Electrical: Acoustic Wave Systems and Devices,   for electrical communication systems in which the intelligence communicated is transmitted in part as acoustic wave energy.
368Horology: Time Measuring Systems or Devices,   subclasses 46+ for electric systems which indicate time and for electric clocks.
370Multiplex Communications,   appropriate subclasses for multiplexing systems.
374Thermal Measuring and Testing,   subclasses 163+ for a thermometer with an electrical heat sensor and a quantitative signalling arrangement.
377Electrical Pulse Counters, Pulse Dividers, or Shift Registers: Circuits and Systems,   subclasses 112+ for electrical counters with display or indication.
380Cryptography,   subclasses 255 through 276for a communication system using cryptography.
381Electrical Audio Signal Processing and Systems,   appropriate subclasses for one-way audio signal transmission and audio signal processing systems.
396Photography,   subclasses 429+ for a camera combined with diverse art devices.
400Typewriting Machines,   appropriate subclasses for typewriters having signals to indicate the condition or operation of the machine. Note particularly subclasses 70+ .
404Road Structure, Process, or Apparatus,   subclasses 9+ for nonelectric roadway structure designed to direct traffic.
406Conveyors: Fluid Current,   subclasses 34+ for conveyors having signals or indicators.
422Chemical Apparatus and Process Disinfecting, Deodorizing, Preserving, or Sterilizing,   subclasses 50+ or 105+ for chemical apparatus having means to electrically signal a condition of said apparatus or the result of a chemical test.
429Chemistry: Electrical Current Producing Apparatus, Product, and Process,   subclasses 90+ for battery having measuring, testing, or indicating means.
434Education and Demonstration,   subclasses 327+ for educational appliances which have a question and hidden answer, some of which signal a correct answer and subclasses 112+ for machines by which a blind person can read printed material, said machine furnishing signals which are a coded representation of the printed material.
441Buoys, Rafts, and Aquatic Devices,   subclasses 6+ for floating buoys utilized for marine navigation.
446Amusement Devices: Toys,   appropriate subclasses for various electric and magnetic toys which utilize electric signals, particularly subclass 142 , 242, 454, and 484+.
505Superconductor Technology: Apparatus, Material, Process,   subclasses 150+ for high temperature (Tc > 30 K) superconducting devices, and particularly subclasses 182+ for light responsive system or subclass 202 for electric communication system.
600Surgery,   subclasses 300+ for electric diagnostic devices having signals or indicators.
700Data Processing: Generic Control Systems or Specific Applications,   subclasses 1 through 89for generic data processing control systems, particularly subclass 18 for programming methods or procedures; and subclasses 90-306 for particular application of data processing systems or calculating computers.
702Data Processing: Measuring, Calibrating, or Testing,   appropriate subclasses for measuring, testing, or calibrating system having significant data processing.
704Data Processing: Speech Signal Processing, Linguistics, Language Translation, and Audio Compression/Decompression,   subclasses 200+ for artificial intelligence systems that process speech signals.
706Data Processing: Aritifical Intelligent,   various subclasses for artificial intelligence systems that represent, apply, and acquire knowledge.
708Electrical Computers: Arithmetic Processing and Calculating,   subclasses 1+ for hybrid computers; subclasses 100+ for digital calculating computers, and subclasses 800+ for analog computers.
709Electrical Computers and Digital Processing Systems: Multicomputer or data transferring,   appropriate subclassesfor data transfer among multiple computer systems.
714Error Detection/Correction and Fault Detection/Recovery,   subclasses for apparatus and corresponding processes relating to generic error detection or correction, or fault detection or recovery.

SUBCLASSES

[List of Patents for class 340 subclass 1.1]    1.1SELECTIVE:
 This subclass is indented under the class definition.  Subject matter for controlling one or more devices to obtain a plurality of results by transmission of a designated one of plural distinctive control signals over a smaller number of communication lines or channels than the total number of possible distinct results.
(1) Note. As used hereinafter, the term "transmitter" refers to the source of signals and the term "receiver" refers to circuitry responsive to such signals.
(2) Note. This subject matter differs from simple switching in providing more than one result per channel in accordance with the signal content, as, for example, addressing one of a plurality of devices over a single channel.
(3) Note. Transmission of signals providing for messages of arbitrary content is not classified herein.
(4) Note. Combinations with a specific art end element are usually classified therewith.

SEE OR SEARCH THIS CLASS, SUBCLASS:

286.01,through 333, for manually actuated alarm systems.
438,through 462, for alarms or indicators associated with the selective control devices of a vehicle, especially subclass 456 for transmission gear selectors and subclasses 457-457.4 for "reminder" indicators of various selectable functions; and subclasses 475-478 for turn signals.
500,through 693.12, for condition responsive indication.
517,through 693.12, for selective indication of one of a plurality of sensed conditions.
853.3,through 853.6, for selective control in a wellbore communications system.
870.01,through 870.44, for telemetry which may be combined with or have selectivity.

SEE OR SEARCH CLASS:

29Metal Working,   appropriate subclasses for miscellaneous manufacturing processes.
60Power Plants,   subclasses 700 through 710and 719 for control of power plants.
82Turning,   subclass 48 for triggered severing or cutoff control.
114Ships,   subclasses 365 through 380for life craft handling.
118Coating Apparatus,   subclass 695 and 696 for selective control of coating apparatus.
177Weighing Scales,   subclass 14 for selectively preset cycle flow terminators.
178Telegraphy,   subclasses 33+ for telegraph selectors.
180Motor Vehicles,   subclasses 6.2 through 6.7, 167-169, and 204 for selective control of motor vehicles.
200Electricity: Circuit Makers and Breakers,   subclasses 1+ for multiple circuit control.
219Electric Heating,   subclass 714 for a remote control system for a microwave heating device.
222Dispensing,   subclass 639 for electrical control of dispensing.
234Selective Cutting (e.g., Punching),   appropriate subclasses.
235Registers,   subclasses 375 through 386for selective control by means of data-bearing records.
244Aeronautics and Astronautics,   subclasses 3.1 through 3.3for missile trajector control and subclasses 175-197 for electric aircraft control.
246Railway Switches and Signals,   appropriate subclasses for selective systems in railway signaling.
273Amusement Devices: Games,   subclass 237 and 238 for electrical board games.
290Prime-Mover Dynamo Plants,   subclasses 7 through 44for electric control of prime-mover dynamo plants.
307Electrical Transmission or Interconnection Systems,   subclass 29 , 37, and 38-41 for control of individual loads in an electric power distribution system; subclass 115 for a power-switching system having selective actuation; and subclasses 401-424 for magnetic reactor systems.
318Electricity: Motive Power Systems,   subclasses 34 through 113for diverse plural controlled electric motors.
322Electricity: Single Generator Systems,   appropriate subclasses for control of electrical generating systems.
327Miscellaneous Active Electrical Nonlinear Devices, Circuits, and Systems,   subclasses 365 through 508for miscellaneous gating circuits and subclasses 518-523 for miscellaneous control circuits.
334Tuners,   subclasses 8 through 10for remotely controlled tuners.
335Electricity: Magnetically Operated Switches, Magnets, and Electromagnets,   subclasses 107 through 126and 138-140 for a selectively controlled switch.
337Electricity: Electrothermally or Thermally Actuated Switches,   subclass 10 and 44 for a selectively controlled switch.
341Coded Data Generation or Conversion,   subclasses 173 through 192for coded generator or transmitter.
342Communications: Directive Radio Wave Systems and Devices (e.g., Radar, Radio Navigation),   appropriate subclass for selective communications in the directive radio wave systems.
345Computer Graphics Processing and Selective Visual Display Systems,   subclasses 1.1 through 3.4for plural display communications systems.
361Electricity: Electrical Systems and Devices,   subclasses 139 through 211for selective control relays and subclass 160 for relay control systems.
365Static Information Storage and Retrieval,   appropriate subclasses for static memory devices which may be selectively operated, or which may be in the form of a matrix.
367Communications, Electrical: Acoustic Wave Systems and Devices,   appropriate subclasses for selective systems having an acoustic communications link, particularly subclasses 197 through 199for selective remote control.
369Dynamic Information Storage or Retrieval,   subclasses 24.01 through 42.01for selective remote control, especially subclasses 30.01-41.01 for selective addressing of storage medium or portion thereof (e.g., programmed access, "jukebox," etc.).
370Multiplex Communications,   appropriate subclasses for multiplex communications, in general.
375Pulse or Digital Communications,   appropriate subclasses for pulse communications, in general.
377Electrical Pulse Counters, Pulse Dividers, or Shift Registers: Circuits and Systems,   appropriate subclasses for electrically operated registers which may have selective operation.
398Optical Communications,   subclasses 106 through 114for optical remote control.
455Telecommunications,   appropriate subclasses for analog communications, in general.
477Interrelated Power Delivery Controls, Including Engine Control,   for interrelated control between a motor and a transmission, clutch, or brake.
700Data Processing: Generic Control Systems or Specific Applications,   subclasses 11 through 27for a data processing sequential or selective generic control system, apparatus, or process.
704Data Processing: Speech Signal Processing, Linguistics, Language Translation, and Audio Compression/Decompression,   subclasses 200 through 278for special signal processing.
705Data Processing, Financial, Business Practice, Management, or Cost/Price Determination,   subclass 5 and 6 for space reservation data processing and subclass 37 for trading, matching, or bidding data processing in financial market.
709Electrical Computers and Digital Processing Systems: Multicomputer Data Transferring,   appropriate subclasses for data transferring among multiple computer systems.
710Electrical Computers and Digital Data Processing Systems: Input/Output,   subclasses 1 through 74for transferring data from one or more peripherals to one or more computers for the latter to process, store, or further transfer or for transferring data from the computers to the peripherals (i.e., input/output processing); subclass 100 for intrasystem connection for access regulating and arbitration within a digital data processing system; subclasses 107-125 for bus access regulating; subclasses 200-244 for generalized locking, polling, access arbitrating; and subclasses 260-269 for interrupt processing.
711Electrical Computers and Digital Processing Systems: Memory,   subclasses 200 through 221for generalized address forming.
  
[List of Patents for class 340 subclass 2.1]    2.1Path selection:
 This subclass is indented under subclass 1.1.  Subject matter having a plurality of alternative communication channels and selection of less than the total number of channels for signal transmission.

SEE OR SEARCH CLASS:

327Miscellaneous Active Electrical Nonlinear Devices, Circuits, and Systems,   subclasses 365 through 508for miscellaneous gating circuits which switch input to output.
370Multiplex Communications,   subclasses 351 through 430for apparatus or technique for locating a route through a switching network wherein two or more simultaneous information signals are conveyed.
379Telephonic Communications,   subclasses 219 through 241for plural exchange network or interconnection and subclasses 242-332 for centralized telephone switching system.
710Electrical Computers and Digital Data, Processing Systems: Input/Output,   subclasses 100 through 132for system intraconnecting, and particularly subclasses 131 and 132 for path selection and switching (e.g., crossbar switching) in a digital data processing system.
  
[List of Patents for class 340 subclass 2.2]    2.2Channel selecting matrix:
 This subclass is indented under subclass 2.1.  Subject matter wherein a communication line is selected using a two or more dimensional array of electrical elements.

SEE OR SEARCH THIS CLASS, SUBCLASS:

14.1through 14.69, for a decoder matrix.
  
[List of Patents for class 340 subclass 2.21]    2.21Plural stages:
 This subclass is indented under subclass 2.2.  Subject matter including multiple levels of plural matrices to form a path through all successive levels.

SEE OR SEARCH THIS CLASS, SUBCLASS:

2.27,for plural matrices in general, subclass 2.6 for plural stage path selection in general, and subclass 14.2 for plural stage decoder matrix.

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370Multiplex Communications,   subclass 388 for apparatus or technique for locating a route through a multistage switching network wherein two or more simultaneous information signals are conveyed.
  
[List of Patents for class 340 subclass 2.22]    2.22Clos type:
 This subclass is indented under subclass 2.21.  Subject matter wherein the multiple levels are arranged in a nonblocking manner.
(1) Note. A nonblocking matrix is one that always has an available path between a particular input and a particular output.
  
[List of Patents for class 340 subclass 2.23]    2.23Alternate routing:
 This subclass is indented under subclass 2.2.  Subject matter wherein the path through the plural stage matrix system may be modified upon failure of connection between the desired input and output line.

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370Multiplex Communications,   subclasses 225 through 228for multiplex fault recovery with inoperative channel bypassing.
  
[List of Patents for class 340 subclass 2.24]    2.24Having master control element:
 This subclass is indented under subclass 2.21.  Subject matter including a supervisory element which controls a plural stage matrix.

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2.26,for channel selecting matrix having master control element in general.
  
[List of Patents for class 340 subclass 2.25]    2.25Folded:
 This subclass is indented under subclass 2.2.  Subject matter wherein inputs and outputs of the two or more dimensional array are on the same side of the array.

SEE OR SEARCH CLASS:

370Multiplex Communications,   subclass 361 for apparatus or technique for locating a route through a folded switching network wherein two or more simultaneous information signals are conveyed.
  
[List of Patents for class 340 subclass 2.26]    2.26Having master control element:
 This subclass is indented under subclass 2.2.  Subject matter including a supervisory element that controls a two or more dimensional array.

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2.24,for plural stage channel selecting matrix having master control element.
  
[List of Patents for class 340 subclass 2.27]    2.27Plural matrices:
 This subclass is indented under subclass 2.2.  Subject matter including multiple, interconnected, two or more dimensional arrays of electrical elements.

SEE OR SEARCH THIS CLASS, SUBCLASS:

2.21through 2.24, for plural stage communication matrices.
  
[List of Patents for class 340 subclass 2.28]    2.28Crosspoint switch detail (i.e., specific cross point):
 This subclass is indented under subclass 2.2.  Subject matter wherein the matrix element is a specific type of switch used to make a connection for signal transmission.
  
[List of Patents for class 340 subclass 2.29]    2.29Semiconductor:
 This subclass is indented under subclass 2.28.  Subject matter wherein the crosspoint element has a conductivity intermediate that of conductors and insulators.

SEE OR SEARCH THIS CLASS, SUBCLASS:

14.6through 14.69, for a semiconductor crosspoint decoder matrix.
  
[List of Patents for class 340 subclass 2.31]    2.31Gas discharge:
 This subclass is indented under subclass 2.28.  Subject matter wherein the crosspoint element comprises a gas discharge tube.

SEE OR SEARCH CLASS:

313Electric Lamp and Discharge Devices,   subclasses 567 through 643for gas discharge device detail.
  
[List of Patents for class 340 subclass 2.4]    2.4Code or pulse responsive:
 This subclass is indented under subclass 2.1.  Subject matter wherein the channel selection is performed in response to a specified pulse pattern or pulse.

SEE OR SEARCH THIS CLASS, SUBCLASS:

12.1,through 12.55, for pulse-responsive selective systems, in general.
  
[List of Patents for class 340 subclass 2.5]    2.5Wiper:
 This subclass is indented under subclass 2.1.  Subject matter wherein a movable electric contact (e.g., a rheostat) is used to establish a channel for signal transmission.

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338Electrical Resistors,   subclass 68 201 for a mechanically variable type resistor (e.g., rheostat), per se.
  
[List of Patents for class 340 subclass 2.6]    2.6Plural stages:
 This subclass is indented under subclass 2.1.  Subject matter including multiple levels of selectors which are used to establish a path through all successive levels for signal transmission.

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2.21through 2.24, for a plural stage channel selecting matrix, and 14.2 for a plural stage decoder matrix.
  
[List of Patents for class 340 subclass 2.7]    2.7Condition of data channel:
 This subclass is indented under subclass 2.1.  Subject matter wherein selection of a channel is based upon the operational condition of system elements.
  
[List of Patents for class 340 subclass 2.71]    2.71Hunting:
 This subclass is indented under subclass 2.7.  Subject matter wherein a search is performed to find a route that is not currently used.
  
[List of Patents for class 340 subclass 2.8]    2.8Data channel selector line:
 This subclass is indented under subclass 2.1.  Subject matter wherein a separate line is used to communicate which of the plurality of possible channels is currently selected for signal transmission.
  
[List of Patents for class 340 subclass 2.81]    2.81Tree or cascade:
 This subclass is indented under subclass 2.1.  Subject matter wherein the communication channels comprise plural circuitry branches selectively operated, each of said branches further exercising selective control upon succeeding circuitry branches, and there being no connection between the separate branch circuits.
  
[List of Patents for class 340 subclass 2.9]    2.9Spare channel:
 This subclass is indented under subclass 2.1.  Subject matter having one or more communication channels additional to those in normal use, which additional channels are used solely in the event of a fault in, or failure of, a normally used communication channel.

SEE OR SEARCH CLASS:

370Multiplex Communications,   subclass 227 and 228 for replacement with a spare in response to a fault in multiplex communication.
714Error Detection/Correction and Fault Detection/Recovery,   subclasses 3 through 14for replacement with a spare in response to a fault in data processing system and subclass 821 for plural parallel communication channels.
  
[List of Patents for class 340 subclass 3.1]    3.1Monitoring in addition to control (e.g., supervisory):
 This subclass is indented under subclass 1.1.  Subject matter wherein a signal representative of the actual status of the controlled device, with respect to an intended controlled function, is transmitted back to the selective signal source.
(1) Note. For classification herein, there must be at least a controller, a sensor, and a controlled device. If only a single controlled device is present, it must exhibit plural functions. Also present must be a control signal and a status signal.
(2) Note. A controller is also called a central or master station.

SEE OR SEARCH CLASS:

700Data Processing: Generic Control Systems or Specific Applications,   subclasses 1 through 89for a data processing generic control system, apparatus, or process in general, particularly subclasses 9 and 10 for supervisory control in a data processing generic control system, apparatus, or process; and subclasses 90-306 for a data processing specific application, apparatus, or process, particularly subclasses 95-212 for product assembly or manufacturing data processing (especially subclass 169 for supervisory machining control) and subclass 241 for central control of plural dispensing units.
  
[List of Patents for class 340 subclass 3.2]    3.2Synchronization:
 This subclass is indented under subclass 3.1.  Subject matter including a reference timing function for operating plural system components.
(1) Note. The reference timing function often includes a clock-pulse generator.

SEE OR SEARCH THIS CLASS, SUBCLASS:

4.2,and 4.21, for such subject matter absent monitoring and control.

SEE OR SEARCH CLASS:

327Miscellaneous Active Electrical Nonlinear Devices, Circuits, and Systems,   subclasses 141 through 163for miscellaneous signal synchronizing.
368Horology: Time Measuring Systems or Devices,   subclass 47 for wireless synchronization in a plural timepiece system or system device.
370Multiplex Communications,   appropriate subclasses for synchronization in multiplex communication and particularly subclasses 503 through 520for synchronizing where information is combined or distributed via time channels.
375Pulse or Digital Communications,   subclasses 354 through 376for pulse or digital communication with synchronization.
713Electrical Computers and Digital Processing Systems: Support,   subclass 400 and 401 for synchronization of clock or timing signals, data, or pulses in digital processing systems.
  
[List of Patents for class 340 subclass 3.21]    3.21Time slot or packet:
 This subclass is indented under subclass 3.2.  Subject matter wherein the reference timing function includes data frame timing signals such as preamble, header, or frame sync code.

SEE OR SEARCH CLASS:

370Multiplex Communications,   appropriate subclasses for multiplex communications using time slots or packets.
  
[List of Patents for class 340 subclass 3.22]    3.22Electromechanical (e.g., relay, rotary distributor):
 This subclass is indented under subclass 3.2.  Subject matter wherein the reference timing function includes a mechanical movable element responsive to electrical input such as a relay or rotary distributor.

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3.8,for monitoring and control utilizing an electromechanical relay in general.

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335Electricity: Magnetically Operated Switches, Magnets, and Electromagnets,   subclasses 2 through 204for electromagnetically actuated switches, per se.
361Electricity: Electrical Systems and Devices,   subclasses 160 through 210for a relay or solenoid control circuit, per se.
  
[List of Patents for class 340 subclass 3.23]    3.23Relay chain:
 This subclass is indented under subclass 3.22.  Subject matter wherein the movable element includes a series of successively connected relay or counter stages.

SEE OR SEARCH THIS CLASS, SUBCLASS:

12.18,through 12.2, for counting in pulse responsive actuation absent monitoring and control.
  
[List of Patents for class 340 subclass 3.24]    3.24Step-by-step:
 This subclass is indented under subclass 3.22.  Subject matter wherein the movable element is actuated in accordance with a number of transmitted signals or impulses.

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6.15,and 6.16, for selective step-by-step impulse party line having indication or alarm and absent monitoring and control.
  
[List of Patents for class 340 subclass 3.3]    3.3Including storage or recording:
 This subclass is indented under subclass 3.1.  Subject matter combined with the production of a permanent or semipermanent record of a control or representative signal.
(1) Note. The term "record" is not limited to a tangible object, but includes a stored pattern in a static storage device (e.g., magnetic core matrix).

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346Recorders,   appropriate subclasses for recorders, per se.
360Dynamic Magnetic Information Storage or Retrieval,   appropriate subclasses for dynamic information storage and retrieval which utilizes a magnetic medium.
365Static Information Storage and Retrieval,   appropriate subclasses for static information storage and retrieval (e.g., memory device).
369Dynamic Information Storage or Retrieval,   appropriate subclasses for dynamic information storage and retrieval in general.
711Electrical Computers and Digital Processing Systems: Memory,   appropriate subclasses for digital processing memory including addressing, accessing, and control thereof.
  
[List of Patents for class 340 subclass 3.31]    3.31Storage at controlled device or sensor:
 This subclass is indented under subclass 3.3.  Subject matter wherein the record is located at either the controlled device or the source of the change in status signal.
  
[List of Patents for class 340 subclass 3.32]    3.32Storage at controller:
 This subclass is indented under subclass 3.3.  Subject matter wherein the record is located at a central station.
  
[List of Patents for class 340 subclass 3.4]    3.4Quiescent:
 This subclass is indented under subclass 3.1.  Subject matter wherein the representative signal is transmitted solely in response to a change in condition.
  
[List of Patents for class 340 subclass 3.41]    3.41Collision avoidance:
 This subclass is indented under subclass 3.4.  Subject matter wherein a protocol is utilized to prevent a transmitting device from interfering with another transmitting device.

SEE OR SEARCH CLASS:

370Multiplex Communications,   subclass 462 for channel access arbitration in multiplex communication.
  
[List of Patents for class 340 subclass 3.42]    3.42Control to avoid fault:
 This subclass is indented under subclass 3.1.  Subject matter wherein a control signal is sent to the controlled device to prevent a malfunction.

SEE OR SEARCH CLASS:

370Multiplex Communications,   subclasses 216 through 228for fault recovery in multiplex communication systems.
700Data Processing: Generic Control Systems or Specific Applications,   subclasses 90 through 306for a data processing specific application, apparatus, or process, particularly subclasses 108-111 for performance monitoring in a data processing application of product assembly and manufacturing.
  
[List of Patents for class 340 subclass 3.43]    3.43Fault condition detection:
 This subclass is indented under subclass 3.1.  Subject matter which produces a representative signal in response to a malfunction of the selective device.
(1) Note. The term "malfunction" is intended to include disagreement between intended and actual controlled function.

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324Electricity: Measuring and Testing,   subclasses 500 through 556for fault detecting in electrical circuits and components.
370Multiplex Communications,   subclasses 216 through 228for fault recovery in multiplex communication systems.
700Data Processing: Generic Control Systems or Specific Applications,   subclasses 90 through 306for a data processing specific application, apparatus, or process, particularly subclasses 108-111 for performance monitoring in a data processing application of product assembly and manufacturing.
714Error Detection/Correction and Fault Detection/Recovery,   appropriate subclasses for error detection/correction, in general.
  
[List of Patents for class 340 subclass 3.44]    3.44Control to correct fault:
 This subclass is indented under subclass 3.43.  Subject matter wherein a control signal is sent to the controlled device to correct a malfunction.
  
[List of Patents for class 340 subclass 3.5]    3.5Including addressing:
 This subclass is indented under subclass 3.1.  Subject matter with a plurality of controlled devices, each of which is responsive to a specific signal so as to permit individual control.

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9.1,through 9.17, for addressing absent a representative signal.

SEE OR SEARCH CLASS:

700Data Processing: Generic Control Systems or Specific Applications,   subclass 23 for sequence program response addressing in a selective or sequential data processing generic control system, apparatus, or process.
711Electrical Computers and Digital Processing Systems: Memory,   subclasses 200 through 221for generalized address forming in a digital data processing system.
  
[List of Patents for class 340 subclass 3.51]    3.51Polling or roll call:
 This subclass is indented under subclass 3.5.  Subject matter wherein all of the controlled devices will transmit a representative signal in response to a particular signal.
(1) Note. The transmission of the representative signals may be done in succession.

SEE OR SEARCH THIS CLASS, SUBCLASS:

10.1through 10.6, for interrogation response.

SEE OR SEARCH CLASS:

370Multiplex Communications,   subclass 346 for polling in time channel multiplex free space communication, subclasses 449-457 for multiplex channel assignment polling techniques, and art collection FOR 164 for polling in time division variable channel assignment.
379Telephonic Communications,   subclasses 92.01 and 92.02 for polling in a telephone system in combination with a diverse electrical system and art collection FOR 114 for polling in a telephone system in combination with a diverse electrical system.
710Electrical Computers and Digital Data Processing Systems: Input/Output,   subclass 44 for prioritized polling for I/O access, subclasses 46 and 47 for I/O polling in general, subclass 109 for bus polling access regulation, subclasses 113-118 for centralized bus prioritizing, subclasses 119-125 for decentralized bus prioritizing, and subclass 220 for generalized access polling in a digital data processing system.
  
[List of Patents for class 340 subclass 3.52]    3.52Group address:
 This subclass is indented under subclass 3.5.  Subject matter wherein the specific signal uniquely identifies multiple devices.

SEE OR SEARCH CLASS:

370Multiplex Communications,   subclass 312 for a free space multiplex message addressed to multiple destinations and subclass 390 for a replicate packet multiplexed message for multiple destination distribution.
  
[List of Patents for class 340 subclass 3.53]    3.53Source address:
 This subclass is indented under subclass 3.5.  Subject matter wherein the specific signal uniquely identifies its origin.
  
[List of Patents for class 340 subclass 3.54]    3.54Destination address:
 This subclass is indented under subclass 3.5.  Subject matter wherein the specific signal uniquely identifies a device which is to receive and act on the signal.
  
[List of Patents for class 340 subclass 3.55]    3.55Pulse counting:
 This subclass is indented under subclass 3.54.  Subject matter wherein pulse tallying is utilized in forming the destination address.

SEE OR SEARCH CLASS:

377Electrical Pulse Counters, Pulse Dividers, or Shift Registers: Circuits and Systems,   appropriate subclasses for pulse counters, in general.
  
[List of Patents for class 340 subclass 3.6]    3.6Scanning:
 This subclass is indented under subclass 3.1.  Subject matter having plural controlled devices with successive transmission of representative signals from each of the controlled devices.
(1) Note. It is generally assumed that each device can use the transmission media during an assigned time slot.

SEE OR SEARCH CLASS:

370Multiplex Communications,   appropriate subclasses for multiplex communication, in general, utilizing time channels or slots.
  
[List of Patents for class 340 subclass 3.61]    3.61Continuous:
 This subclass is indented under subclass 3.6.  Subject matter wherein the scanning is automatically restarted at its conclusion.
  
[List of Patents for class 340 subclass 3.62]    3.62Interrupted:
 This subclass is indented under subclass 3.6.  Subject matter having structure to interrupt the normal scanning sequence.
(1) Note. Such interruption may be for the purpose of obtaining an indication of a particular controlled device.
  
[List of Patents for class 340 subclass 3.63]    3.63Automatic:
 This subclass is indented under subclass 3.62.  Subject matter wherein the interruption is in response to a predetermined representative signal.
  
[List of Patents for class 340 subclass 3.7]    3.7Including indicator:
 This subclass is indented under subclass 3.1.  Subject matter having an element which produces a humanly perceptible signal.

SEE OR SEARCH THIS CLASS, SUBCLASS:

6.1,through 8.1, for selective communication having an indication or alarm, in general.
384.1through 404.3, for an audible indicator, per se.
407.1through 407.2, for a tactual indicator, per se.

SEE OR SEARCH CLASS:

700Data Processing: Generic Control Systems or Specific Applications,   subclasses 1 through 89for a data processing generic control system, apparatus, or process in general, particularly subclass 27 for sequence program response status indication in a data processing sequential or selective generic control system, apparatus, or process.
  
[List of Patents for class 340 subclass 3.71]    3.71Having manual control input:
 This subclass is indented under subclass 3.7.  Subject matter wherein a user manually inputs a control signal correlated to an indicator.

SEE OR SEARCH CLASS:

700Data Processing: Generic Control Systems or Specific Applications,   subclasses 1 through 89for a data processing generic control system, apparatus, or process in general, particularly subclasses 17 and 18 for an operator interface in a data processing sequential or selective generic control system, apparatus, or process.
  
[List of Patents for class 340 subclass 3.8]    3.8Electromechanical relay:
 This subclass is indented under subclass 3.1.  Subject matter having an electromechanical relay.

SEE OR SEARCH THIS CLASS, SUBCLASS:

3.22through 3.24, for synchronization in monitoring and control utilizing an electromechanical relay.

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335Electricity: Magnetically Operated Switches, Magnets, and Electromagnets,   subclasses 2 through 204for electromagnetically actuated switches, per se.
361Electricity: Electrical Systems and Devices,   subclasses 160 through 210for a relay or solenoid control circuit, per se.
  
[List of Patents for class 340 subclass 3.9]    3.9Control then monitoring:
 This subclass is indented under subclass 3.1.  Subject matter wherein the status signal is an indication of the status of the function being controlled.
(1) Note. The status signal is generally a confirmation of whether the controlled function has been completed.
  
[List of Patents for class 340 subclass 4.1]    4.1Communication or control for the handicapped:
 This subclass is indented under subclass 1.1.  Subject matter particularly adapted for control by, or for communication to, a physically impaired individual.

SEE OR SEARCH CLASS:

704Data Processing: Speech Signal Processing, Linguistics, Language Translation, and Audio Compression/Decompression,   subclasses 258 through 269for a speech synthesizer using sequential sounds and subclass 271 for handicap aid in speech.
  
[List of Patents for class 340 subclass 4.11]    4.11Remote control:
 This subclass is indented under subclass 4.1.  Subject matter wherein the function is performed by a control command generated at a location geographically separated from the controlled device.
  
[List of Patents for class 340 subclass 4.12]    4.12Tactile:
 This subclass is indented under subclass 4.1.  Subject matter wherein communication to the handicapped individual is provided by a sensation of touch.
  
[List of Patents for class 340 subclass 4.13]    4.13Visual:
 This subclass is indented under subclass 4.1.  Subject matter wherein communication to the handicapped individual is a signal that can be seen.
  
[List of Patents for class 340 subclass 4.14]    4.14Audible:
 This subclass is indented under subclass 4.1.  Subject matter wherein communication to the handicapped individual is a signal that can be heard.
  
[List of Patents for class 340 subclass 4.2]    4.2Synchronizing:
 This subclass is indented under subclass 1.1.  Subject matter including a reference timing function with respect to which different control functions are performed.
  
[List of Patents for class 340 subclass 4.21]    4.21With addressing:
 This subclass is indented under subclass 4.2.  Subject matter having plural controlled devices, each one of which is actuated by a signal having a unique characteristic corresponding to the respective one of the controlled devices.
(1) Note. The term "unique characteristics" refers to a parameter, the content, or the relative time of occurrence of the signal.
  
[List of Patents for class 340 subclass 4.3]    4.3Program control:
 This subclass is indented under subclass 1.1.  Subject matter wherein the controlling function is carried out by performing a series of steps (usually using a computer).
(1) Note. This subclass is provided for nominal computer program control.
  
[List of Patents for class 340 subclass 4.31]    4.31Operator initiated:
 This subclass is indented under subclass 4.3.  Subject matter wherein a human operator initiates the program control.
  
[List of Patents for class 340 subclass 4.32]    4.32Download through data network:
 This subclass is indented under subclass 4.3.  Subject matter wherein the program is downloaded through a network of send/receive data terminals.
  
[List of Patents for class 340 subclass 4.33]    4.33Download through distribution network:
 This subclass is indented under subclass 4.3.  Subject matter wherein the program is downloaded through a central sender network.
  
[List of Patents for class 340 subclass 4.34]    4.34Enable/disable (e.g., kill machine signal, etc.):
 This subclass is indented under subclass 4.3.  Subject matter wherein the program control includes enabling or disabling a function of a device.
  
[List of Patents for class 340 subclass 4.35]    4.35Time sequential manner:
 This subclass is indented under subclass 4.3.  Subject matter wherein the program controls the order in which the different results are achieved with respect to time.
  
[List of Patents for class 340 subclass 4.36]    4.36Machine tool:
 This subclass is indented under subclass 4.3.  Subject matter for controlling of a work-contacting element which causes a physical alteration in the work (e.g., chipping, boring, etc.).

SEE OR SEARCH CLASS:

700Data Processing: Generic Control Systems or Specific Applications,   subclasses 159 through 195for computer data processing controlled machine tool.
  
[List of Patents for class 340 subclass 4.37]    4.37Of audio system:
 This subclass is indented under subclass 4.3.  Subject matter wherein the program controls various aspects of an audible signal producing system.
(1) Note. Included herein is selection of distinct audio messages.

SEE OR SEARCH THIS CLASS, SUBCLASS:

4.4,for nonprogram audio system control.
  
[List of Patents for class 340 subclass 4.4]    4.4Audio reproducing system (e.g., by pulse signal, etc.):
 This subclass is indented under subclass 1.1.  Subject matter wherein the controlled device is a nominally recited device for playing back of stored audio signals.
(1) Note. A selectively controlled audio system with details thereof is classified with such an audio system.

SEE OR SEARCH THIS CLASS, SUBCLASS:

4.37,for such subject matter with program control thereof.
7.57,for coded responsive audible message presentation.
7.62,for coded responsive audio alert.

SEE OR SEARCH CLASS:

360Dynamic Magnetic Information Storage or Retrieval,   subclasses 77.01 through 77.17for selection of a track on a magnetic record carrier.
369Dynamic Information Storage or Retrieval,   subclasses 30.27 through 30.37and subclass 33.01 for selective control circuitry in optical storage medium and in phonographs, respectively.
455Telecommunications,   subclass 88 , 92, 151.1, or 352 through 355, as appropriate, for remote control of a modulated wave communication system or subsystem.
  
[List of Patents for class 340 subclass 4.41]    4.41Plural devices:
 This subclass is indented under subclass 4.4.  Subject matter comprising more than one controlled device.
  
[List of Patents for class 340 subclass 4.42]    4.42Wireless:
 This subclass is indented under subclass 4.4.  Subject matter wherein the control signals are wirelessly transmitted.
  
[List of Patents for class 340 subclass 4.5]    4.5Stock quotation:
 This subclass is indented under subclass 1.1.  Subject matter wherein the controlled device is particularly designed for displaying share prices of a particular corporation and is geographically separated from the information source of such prices.
(1) Note. The device may include control circuitry for inquiring about a designated stock.

SEE OR SEARCH CLASS:

705Data Processing: Financial, Business Practice, Management, or Cost/Price Determination,   subclass 37 for subject matter combined with a data processing feature.
  
[List of Patents for class 340 subclass 4.51]    4.51With information storage:
 This subclass is indented under subclass 4.5.  Subject matter having an arrangement to store the stock price information.
(1) Note. Detailed structure of the storage arrangement is classified in an appropriate information storage class.
  
[List of Patents for class 340 subclass 4.6]    4.6Space allocation (e.g., vehicle seat, hotel reservation, etc.):
 This subclass is indented under subclass 1.1.  Subject matter including a display for indicating the availability of spaces which may be reserved, and a control for modifying such availability by making or canceling reservations for the spaces.

SEE OR SEARCH CLASS:

705Data Processing: Financial, Business Practice, Management, or Cost/Price Determination,   subclass 5 and 6 for subject matter combined with a data processing feature.
  
[List of Patents for class 340 subclass 4.61]    4.61Remote terminal:
 This subclass is indented under subclass 4.6.  Subject matter having an information storage device in which the space availability is stored at a geographically spaced location from the display and control terminal.
  
[List of Patents for class 340 subclass 4.62]    4.62Wireless:
 This subclass is indented under subclass 4.61.  Subject matter having wireless communication between geographically spaced remote terminals.
  
[List of Patents for class 340 subclass 5.1]    5.1Intelligence comparison for controlling:
 This subclass is indented under subclass 1.1.  Subject matter which compares an information bearing item or signal with an information reference, and performing a control function in accordance with the comparison.
(1) Note. System controlled by data bearing record (e.g., credit card) having significantly claimed data bearing record feature or record sensing is excluded herein, see search notes below.

SEE OR SEARCH THIS CLASS, SUBCLASS:

7.1,for paging to control diverse device.

SEE OR SEARCH CLASS:

70Lock,   appropriate subclasses for mechanical locking systems and devices.
235Registers,   subclasses 375 through 386for systems controlled by data bearing records (e.g., credit card); subclasses 435-486 for coded record sensors; and subclasses 487-495 for data bearing records, per se.
327Miscellaneous Active Electrical Nonlinear Devices, Circuits, and Systems,   subclass 1 for signal discriminating having comparison without subsequent control.
714Error Detection/Correction and Fault Detection/Recovery,   subclasses 735 through 737for computer error comparison wherein operational condition is determined by comparing device response to various criteria.
  
[List of Patents for class 340 subclass 5.2]    5.2Authorization control (e.g., entry into an area):
 This subclass is indented under subclass 5.1.  Subject matter wherein the comparison determines operation of a controlled device to permit an individual to perform an action.
(1) Note. Lock with significant mechanical structure is excluded from this subclass, see search note below.

SEE OR SEARCH CLASS:

70Locks,   appropriate subclasses for mechanical locking systems and devices.
235Registers,   subclass 382 for similar subject matter where entry is controlled by a data bearing record.
348Television,   subclass 156 for observation of or from a specific location (e.g., surveillance) by a camera to permit entrance or exit of an authorized person or vehicle.
399Electrophotography,   subclass 366 for document handling of unauthorized copy prevention.
463Amusement Devices: Games,   subclass 29 for access or authorization (e.g., game selection, security, etc.) in a data processing game apparatus.
705Data Processing, Financial, Business Practice, Management, or Cost/Price Determination,   subclass 44 for credit processing requiring authorization.
  
[List of Patents for class 340 subclass 5.21]    5.21Varying authorization:
 This subclass is indented under subclass 5.2.  Subject matter wherein the comparison is based on a changeable verification logic or data.

SEE OR SEARCH CLASS:

235Registers,   subclass 382.5 for credit or identification card system having an arrangement to modify date required for permitting access.
  
[List of Patents for class 340 subclass 5.22]    5.22Code learning:
 This subclass is indented under subclass 5.21.  Subject matter wherein the comparison is based on a presettable or calculated control code.
(1) Note. Authorization control by password, or I.D. in a computerized control dispensing or vending system is excluded from this subclass, see search notes below.

SEE OR SEARCH THIS CLASS, SUBCLASS:

5.26,for varying authorization by code rotating or scrambling.
5.51,for authorization control by manual code input.
5.6,for authorization control by coded record input (e.g., IC card or key).
10.51through 10.52, for transponder programming.

SEE OR SEARCH CLASS:

341Coded Data Generation or Conversion,   subclass 78 for a programmable code converter apparatus.
700Data Processing: Generic Control Systems or Specific Applications,   subclass 237 , for authorization control by password, or I.D. in a computerized control dispensing or vending system.
  
[List of Patents for class 340 subclass 5.23]    5.23Programming from coded record to controller:
 This subclass is indented under subclass 5.22.  Subject matter wherein authorization control data stored in a controller (e.g., lock) is defined or modified in response to a received code from a data bearing record or carrier.
(1) Note. This subclass includes updating or programming of codes in a lock using key or card input.
  
[List of Patents for class 340 subclass 5.24]    5.24Using additional record or carrier code:
 This subclass is indented under subclass 5.23.  Subject matter wherein a first set of data bearing record or carrier code is changed using a second set of data bearing record or carrier code during programming of authorization control data.
(1) Note. This subclass includes system where a second key or card code is required to authorize programming of a first code.
  
[List of Patents for class 340 subclass 5.25]    5.25Programming of coded record:
 This subclass is indented under subclass 5.22.  Subject matter wherein the presettable or calculated code is stored in a programmable data bearing record or carrier (e.g., electronic key or card ).
(1) Note. This subclass includes updating or programming a code stored on a key or card.
  
[List of Patents for class 340 subclass 5.26]    5.26Code rotating or scrambling:
 This subclass is indented under subclass 5.21.  Subject matter wherein the comparison is based on a control code or key that is effected by a counter/timer control means or an encryption/decryption algorithm for an adequate security purpose.
(1) Note. Security system having significantly claimed cryptography technique without a control code or key is excluded herein, see search notes below.

SEE OR SEARCH THIS CLASS, SUBCLASS:

5.22,for varying authorization control by code learning.
5.51,for authorization control by manual code input.
5.6,for authorization control by coded record input (e.g., IC card or key).

SEE OR SEARCH CLASS:

380Cryptography,   subclasses 255 through 276for communication system using cryptography.
902Electronic Funds Transfer,   subclass 2 for encryption or decryption of transmitted data in a fund transfer system.
705Data Processing: Financial, Business Practice, Management, or Cost/Price Determination,   subclasses 50 through 80for business processing using cryptography.
713Electrical Computers and Digital Processing Systems: Support,   subclasses 150 through 184for multiple computer communication using cryptography, subclasses 182-186 for system access control based on user identification by cryptography, subclass 187 for program modification detection by cryptography, subclass 188 for computer virus detection by cryptography, subclass 189 for data processing using cryptography.
  
[List of Patents for class 340 subclass 5.27]    5.27Rule based input:
 This subclass is indented under subclass 5.21.  Subject matter wherein the comparison is based on a desired pattern of user responses to queries.
(1) Note. Mere data recall responsive to query is excluded from this subclass, see search notes below.

SEE OR SEARCH THIS CLASS, SUBCLASS:

10.1through 10.6, for interrogation response.

SEE OR SEARCH CLASS:

706Data Processing: Artificial Intelligence,   subclass 47 for a knowledge processing system using rule-based reasoning method.
  
[List of Patents for class 340 subclass 5.28]    5.28Timed access blocking:
 This subclass is indented under subclass 5.2.  Subject matter wherein the comparison allows the action to be performed to occur during specified period.

SEE OR SEARCH THIS CLASS, SUBCLASS:

309.16through 309.9, for a timed controlled communication system.
528,for time delay entry/exit.

SEE OR SEARCH CLASS:

49Movable or Removable Closures,   subclass 29 for time controlled closures.
70Locks,   subclasses 272 through 274for clockwork control operating mechanism, and Dig 45 for time lock and auxiliary lock operable on failure of time lock.
368Horology: Time Measuring Systems or Devices,   appropriate subclasses.
  
[List of Patents for class 340 subclass 5.3]    5.3Having indication of improper access:
 This subclass is indented under subclass 5.2.  Subject matter which additionally produces a signal indicative of an invalid access attempt.
(1) Note. Included herein is alarm and logging of successful and unsuccessful comparisons and tamper indication.
(2) Note. Indication without access control is excluded from this subclass, see search notes below.

SEE OR SEARCH THIS CLASS, SUBCLASS:

287through 309, for a signal box alarm arrangement, particularly subclass 288 for alarm transmission over a power line.
426.1through 426.36, for vehicle alarms or indication of burglary or unauthorized use.
541through 567, for an intrusion responsive indicator or alarm.

SEE OR SEARCH CLASS:

49Movable or Removable Closures,   subclasses 13 through 14for closure condition indicator.
70Locks,   subclasses 432 through 441and Dig. 49 for Locks with indicator or alarm.
109Safes, Bank Protection, or a Related Device,   subclass 21 for bank protection device with alarm or indicator, subclass 31 for art device combined with fluent material distributing, generating device for alarm or indicator, subclass 38 for combined art device with alarm or indicator.
116Signals and Indicators,   subclass 6 for burglar alarm and subclass 33 for vehicle theft prevention.
348Television,   subclass 152 for intrusion detection by a television camera.
379Telephonic Communications,   subclass 37 for emergency or alarm communications (e.g., watchman s circuit), particularly subclass 39 for responsive to sensed nonsystem condition, external to the telephone system, and subclasses 106.01-106.11 for remote condition indication, other than an emergency or alarm condition, over a telephone line.
  
[List of Patents for class 340 subclass 5.31]    5.31Lockout or disable:
 This subclass is indented under subclass 5.3.  Subject matter wherein the produced indicative signal causes a preventive condition of the operation of the controlled device (e.g., inacccessible or inoperative).

SEE OR SEARCH THIS CLASS, SUBCLASS:

5.7through 5.73, for access barrier
5.74,for access to electrical information.

SEE OR SEARCH CLASS:

123Internal-Combustion Engines,   subclass 179.4 for condition responsive control of starting device including automatic engine stop, subclass 333 for engine speed reduction for fuel cutoff.
180Motor Vehicles,   subclass 279 and 283 for circuit interruption of vehicle motor or ignition circuit for safety of the vehicle.
307Electrical Transmission or Interconnection Systems,   subclasses 10.3 through 10.5for vehicle ignition or starting circuit lock.
379Telephonic Communications,   subclasses 188 through 200for call restriction from a particular station, or for alerting signal generation in response to a call or call attempt in violation of a call restriction.
  
[List of Patents for class 340 subclass 5.32]    5.32Visual indication:
 This subclass is indented under subclass 5.3.  Subject matter wherein the produced indicative signal is visually perceptible.

SEE OR SEARCH THIS CLASS, SUBCLASS:

815.4through 815.92, for specific visual indication communication system and method.

SEE OR SEARCH CLASS:

345Computer Graphics Processing and Selective Visual Display Systems,   subclass 618 for display indication of an unusual status (e.g., an alarm indication via an icon or a change in color based on an unusual condition, etc.).
  
[List of Patents for class 340 subclass 5.33]    5.33Including link to a remote indicator:
 This subclass is indented under subclass 5.3.  Subject matter comprising means for communicating the produced indicative signal to a distant indicator.

SEE OR SEARCH THIS CLASS, SUBCLASS:

5.18,for plural controlled devices by input from a central location.
5.25through 5.27, for wireless transceiver in a coded record input authorization control system.
5.28,for wireless transmitter in a coded record authorization control system.
531through 539.32 , for a condition responsive indicating system having particular link between sensing and indicating means.
541through 567, for intrusion detection alarm.
568.1through 572.9, for article placement or removal alarms.

SEE OR SEARCH CLASS:

49Movable or Removable Closure,   subclass 14 for closure condition indicator at remote station.
379Telephonic Communications,   subclass 106.01 for remote indicator over telephone line.
  
[List of Patents for class 340 subclass 5.4]    5.4Credit:
 This subclass is indented under subclass 5.2.  Subject matter wherein a comparison is made with a balance in an individual"s account so as to permit or deny immediate receipt of a desired product.
(1) Note. Significant data processing system for credit transaction is excluded from this subclass. See search notes below.

SEE OR SEARCH CLASS:

235Registers,   subclasses 380 through 382.5for credit card operated registers having significant card reading structure.
379Telephonic Communications,   subclasses 91.01 through 91.02for credit authorization in a combined telephone system.
463Amusement Devices: Games,   subclass 25 for access or authorization (e.g., game selection, security, etc.) in a data processing game apparatus controlled by available credit.
705Data Processing: Financial, Business Practice, Management, or Cost/ Price Determination,   subclass 38 and 39-45 for a computer data processing for credit transaction system with insignificant communication feature.
902Electronic Funds Transfer,   appropriate subcollections for a cross-reference art collection of disclosures of fund transfer systems.
  
[List of Patents for class 340 subclass 5.41]    5.41Banking or financing:
 This subclass is indented under subclass 5.4.  Subject matter wherein the desired product is associated with a business administration which plans the disposition or use of fund, security, extension of credit, or loan.

SEE OR SEARCH THIS CLASS, SUBCLASS:

4.5,and 4.51, for stock quotation.

SEE OR SEARCH CLASS:

235Registers,   subclass 379 for controlled data bearing record in a banking system.
705Data Processing, Financial, Business Practice, Management, or Cost/ Price Determination,   subclasses 35 through 45for a computer data processing in a banking or financing application.
  
[List of Patents for class 340 subclass 5.42]    5.42Debiting (e.g., rental):
 This subclass is indented under subclass 5.4.  Subject matter wherein an amount is substracted from a positive balance to permit receipt of the desired product.

SEE OR SEARCH CLASS:

455Telecommunications,   subclass 409 for usage measurement for rental telephone.
  
[List of Patents for class 340 subclass 5.5]    5.5Input from central location for plural controlled devices:
 This subclass is indented under subclass 5.2.  Subject matter wherein more than one device is being controlled by signal inputted from a central station.

SEE OR SEARCH THIS CLASS, SUBCLASS:

5.14,for a remote indicator of an improper access.
5.25through 5.27, for coded record input device having wireless transceiver for remote control.
5.28,for coded record input device having wireless transmitter for remote control.

SEE OR SEARCH CLASS:

49Movable or Removable Closures,   subclasses 15 through 20for jail type closure with remote control, subclass 24 for individually controlled closures with master control, subclass 25 for closure with radiant energy control, subclasses 29-30 for time controlled closure, subclass 31 for condition responsive control.
70Locks,   subclass 264 for central control, Dig 16 for jail door lock.
379Telephonic Communications,   subclass 102.02 for remote control of a device that has the primary function of receiving or transmitting information.
  
[List of Patents for class 340 subclass 5.51]    5.51Manual code input:
 This subclass is indented under subclass 5.2.  Subject matter wherein the information bearing signal is generated by input from a user.
(1) Note. The input may includes, for example, information picked up from a device worn by a user, or user input information, etc.

SEE OR SEARCH THIS CLASS, SUBCLASS:

5.22,for authorization control in which control code is programmed.
5.26,for authorization control wherein control code is varied by rotating or scrambling technique.
5.6,for authorization by coded record input (e.g., IC card or key).

SEE OR SEARCH CLASS:

341Coded Data Generation or Conversion,   appropriate subclasses for code converter, code generator, or code transmitter system or method per se, particularly subclasses 22 through 34for bodily actuated code generator including keyboard or keypad.
  
[List of Patents for class 340 subclass 5.52]    5.52Biometrics:
 This subclass is indented under subclass 5.51.  Subject matter wherein the information bearing signal is generated from data specific to a users body.

SEE OR SEARCH THIS CLASS, SUBCLASS:

5.82through 5.84, for an authentication system in which body characteristic is used for verification or identification.

SEE OR SEARCH CLASS:

382Image Analysis,   subclasses 115 through 127for personal identification including biometrics.
704Data Processing: Speech Signal Processing, Linguistics, Language Translation, and Audio Compression/Decompression,   subclasses 246 through 250for voice recognition, subclass 273 for speech signal processing in a security system.
902Electronic Funds Transfer,   subclass 3 for electronic funds transfer system having means for analyzing physical characteristic of user (e.g., fingerprint, handprint).
  
[List of Patents for class 340 subclass 5.53]    5.53Image (e.g., fingerprint, face):
 This subclass is indented under subclass 5.52.  Subject matter wherein the data specific to a user s body is a pattern picturing a part of the user s body.
(1) Note. The pattern, can be a digital representation of the body part.

SEE OR SEARCH THIS CLASS, SUBCLASS:

5.4,for an authentication system in which image of user body characteristic is used for verification or identification.

SEE OR SEARCH CLASS:

382Image Analysis,   subclass 115 for image or pattern analyzing for recognizing a person.
  
[List of Patents for class 340 subclass 5.54]    5.54Password:
 This subclass is indented under subclass 5.51.  Subject matter wherein the information bearing signal comprises user identification code for security purpose.

SEE OR SEARCH THIS CLASS, SUBCLASS:

5.85,for an authentication system in which user identification number is used for verification or identification

SEE OR SEARCH CLASS:

700Data Processing: Generic Control Systems or Specific Applications,   subclass 225 for data processing article handling system having identification code, subclasses 221-222 for identification code in a plural articles handling data processing system; subclass 237 for password authorization in a computerized dispensing or vending apparatus.
705Data Processing: Financial, Business Practice, Management, or Cost/ Price Determination,   subclass 18 for a point of sale terminal having security or user identification provision (password entry, etc.).
711Electrical Computers and Digital Processing Systems: Memory,   subclass 164 for memory access control by password or key.
726Information Security,   subclasses 1 through 30for information security in computers or digital processing system.
902Electronic Funds Transfer,   subclass 5 for electronic funds transfer having means to enter personal identification numbers.
  
[List of Patents for class 340 subclass 5.55]    5.55Rotary input:
 This subclass is indented under subclass 5.51.  Subject matter wherein the information bearing signal comprises input from a dial or code wheel mechanism.

SEE OR SEARCH CLASS:

70Locks,   subclass 278.4 for lock with dial input
341Coded Data Generation or Conversion,   subclass 35 for bodily actuated code generator with rotary dial, subclass 192 for code generator or transmitter with rotary distributor.
  
[List of Patents for class 340 subclass 5.6]    5.6Coded record input (e.g., IC card or key):
 This subclass is indented under subclass 5.2.  Subject matter wherein the information bearing signal is generated from coded data stored in a data bearing record or carrier.

SEE OR SEARCH THIS CLASS, SUBCLASS:

5.22through 5.25, for varying authorization by code learning having coded record.
5.26,for varying authorization by code rotating or scrambling.
5.51through 5.55, for authorization control by manual code input.

SEE OR SEARCH CLASS:

49Movable or Removable Closures,   subclass 35 for check or key controlled closure.
70Locks,   subclass 278 ,2-278.3 and subclasses 284-285 for key controlled lock.
235Registers,   subclasses 380 through 382.5for identification card operated registers having significant card reading structure.
  
[List of Patents for class 340 subclass 5.61]    5.61Wireless transceiver:
 This subclass is indented under subclass 5.6.  Subject matter comprising a transmitter-receiver device for exchanging information over free space.
(1) Note. The free space is a medium that is not a wire or wave-guide.
(2) Note. For similar subject matter having only one way communication of data. See search notes below.

SEE OR SEARCH THIS CLASS, SUBCLASS:

5.33,for a remote indicator of an improper access.
5.5,for plural controlled devices by input from a central location.
5.64,for coded record input device authorization control system including wireless transmitter
10.1through 10.6, for interrogation-response system.
572.1through 572.7, for security tags.

SEE OR SEARCH CLASS:

341Coded Data Generation or Conversion,   subclass 176 for code generator or transmitter in which the transmitter produces a signal for control of a remotely located device.
  
[List of Patents for class 340 subclass 5.62]    5.62Including manual switching means:
 This subclass is indented under subclass 5.61.  Subject matter comprising a make and break device actuated by user input for
(1) Note. The user input can include proximity detection.

SEE OR SEARCH THIS CLASS, SUBCLASS:

541through 567, for intrusion detection.

SEE OR SEARCH CLASS:

341Coded Data Generation or Conversion,   subclasses 20 through 35for bodily actuated code generator.
  
[List of Patents for class 340 subclass 5.63]    5.63Including timing means (e.g., clock):
 This subclass is indented under subclass 5.61.  Subject matter wherein the exchange of information is initiated by a timing or clock signal.

SEE OR SEARCH THIS CLASS, SUBCLASS:

5.28,for time access blocking.

SEE OR SEARCH CLASS:

70Locks,   subclasses 272 through 274and Dig. 45 for locks with clock control.
368Horology: Time Measuring Systems or Devices,   appropriate subclasses.
455Telecommunications,   subclass 171.1 and 181.1 with time actuated or time controlled receiver for locks with clock control, subclass 231 for lock with local control of receiver operation at specific time intervals.
  
[List of Patents for class 340 subclass 5.64]    5.64Wireless transmitter:
 This subclass is indented under subclass 5.6.  Subject matter comprising a transmission device for sending information over free space.
(1) Note. Free space is a medium which is not a wire or wave-guide.

SEE OR SEARCH THIS CLASS, SUBCLASS:

5.33,for a remote indicator of an improper access.
5.5,for plural controlled devices by input from a central location.
5.61through 5.63, for coded record input device authorization control system including wireless transceiver.
12.22,12.5, 12.51, and 13.24-13.32, for selective control responsive to wireless signal.

SEE OR SEARCH CLASS:

123Internal-Combustion Engines,   subclass 179.2 for remote control of starting device.
318Electricity: Motive Power Systems,   subclass 16 for radio controlled motors.
341Coded Data Generation or Conversion,   subclass 176 for code generator or transmitter in which the transmitter produces a signal for control of a remotely located device.
  
[List of Patents for class 340 subclass 5.65]    5.65Electronic coded record:
 This subclass is indented under subclass 5.6.  Subject matter comprising details of electronic circuitry or data processing means of a card or key.

SEE OR SEARCH CLASS:

70Locks,   Dig. 46 for conducting key.
235Registers,   subclasses 441 through 443for electric contact sensors, subclass 492 for conductive records.
257Active Solid-State Devices (e.g., Transistors,   Solid-State Diodes) subclass 679 for smart card package.
  
[List of Patents for class 340 subclass 5.66]    5.66Magnetic coded record:
 This subclass is indented under subclass 5.6.  Subject matter comprising details of magnetic element (e.g., magnetic card key decoder, magnetic card key, etc.) of a card or key.

SEE OR SEARCH CLASS:

235Registers,   subclasses 449 through 450for magnetic sensors, subclass 493 for magnetic records.
  
[List of Patents for class 340 subclass 5.67]    5.67Mechanical coded record:
 This subclass is indented under subclass 5.6.  Subject matter comprising details of mechanical structure (e.g., mechanical key, mechanical key decoder, etc.) of a card or key.
(1) Note. System with significant mechanical lock structure is excluded from this subclass. See search notes below.

SEE OR SEARCH CLASS:

70Locks,   subclasses 278.2 through 278.3and subclasses 284-285 for key controlled lock, subclasses 336-340 for key operated locks.
235Registers,   subclasses 444 through 448for electromechanical sensor, subclass 453 for mechanical sensor, subclasses 458-460 for optical sensing of perforated record, subclass 489 for perforated record.
  
[List of Patents for class 340 subclass 5.7]    5.7Access barrier:
 This subclass is indented under subclass 5.2.  Subject matter wherein the action performed is a control of an element for opening or closing an entrance.
(1) Note. The element includes, for example, a door.

SEE OR SEARCH CLASS:

49Movable or Removable Closures,   appropriate subclasses, subclasses 15 through 20for jail type closures with similar latching devices.
52Static Structures (e.g., Buildings),   for closures and related structure provided in that class
53Package Making,   subclasses 329 through 366for package structure having closure securing means.
70Locks,   subclass 271 for operating mechanism of time controlled electric lock, and subclasses 277-283.1 for operating mechanism of electric locks.
105Railway Rolling Stock,   appropriate subclasses for closures associated with both passenger and freight cars
109Safes, Bank Protection, or a Related Device,   subclasses 6 through 8for plural closures used as a trapping mechanism, subclasses 11-18 for a protective shield movable from a retracted position to an operative position, and subclasses 64 -77 for a movable closure combined with a safe or like structure.
187Elevator, Industrial Lift Truck, or Stationary Lift for Vehicle,   subclasses 313 through 335for a barrier in combination with other elevator structure which regulates access to or from an elevator car and subclasses 336.
292Closure Fasteners,   subclass 144 , 201, 341.16 for various type of fasteners with motors, subclass 342 for means for closing an elevator shaft opening through a landing.
342Communications: Directive Radio Wave Systems and Devices (e.g., Radar, Radio Navigation),   appropriate subclasses for closures associated with both passenger and freight cars
361Electricity: Electrical Systems and Devices,   subclass 172 for code responsive operated relays or solenoids.
379Telephonic Communications,   subclass 102.06 for remote control over telephone line for permitting or preventing physical entrance or exit lock.
  
[List of Patents for class 340 subclass 5.71]    5.71Garage door:
 This subclass is indented under subclass 5.32.  Subject matter wherein the element is a vehicle gate.

SEE OR SEARCH THIS CLASS, SUBCLASS:

5.64,for authorization control using wireless transmitter.

SEE OR SEARCH CLASS:

70Locks,   dig. 11 for garage door locks.
318Electricity: Motive Power Systems,   subclass 16 for radio controlled motors.
  
[List of Patents for class 340 subclass 5.72]    5.72Vehicle door:
 This subclass is indented under subclass 5.7.  Subject matter wherein the element is an automotive door.

SEE OR SEARCH THIS CLASS, SUBCLASS:

5.31,for vehicle disabling due to improper access.
5.64,for authorization control using wireless transmitter.

SEE OR SEARCH CLASS:

70Locks,   subclasses 237 through 260for vehicle locks.
180Motor Vehicles,   subclasses 287 through 290for preventing unauthorized access of motor vehicle.
296Land Vehicles: Bodies and Tops,   particularly subclasses 146.1 through 146.16for doors and windows.
307Electrical Transmission or Interconnection Systems,   subclasses 10.1 through 10.5for automotive anti-theft system.
701Data Processing: Vehicles, Navigation, and Relative Location,   subclass 49 for vehicle equipment position control (e.g., seat, mirror, door, window, headrest or headlamp).
  
[List of Patents for class 340 subclass 5.73]    5.73Lockbox:
 This subclass is indented under subclass 5.7.  Subject matter wherein the element is for a safety deposit box.
(1) Note. This subclass includes real estate lock boxes.

SEE OR SEARCH THIS CLASS, SUBCLASS:

542,for detection of unauthorized or improper operation of locking device.

SEE OR SEARCH CLASS:

70Lock,   appropriate subclasses for mechanisms associated with locks or their operating features, particularly subclass 63 for receptacles.
109Safes, Bank Protection, or a Related Device,   subclasses 45 through 49for safety deposit boxes and their compartments.
222Dispensing,   subclasses 153.01 through 153.14for locks combined with dispensing devices.
  
[List of Patents for class 340 subclass 5.74]    5.74Access to electrical information:
 This subclass is indented under subclass 5.2.  Subject matter wherein the individual is authorized to obtain information or data signal.
(1) Note. This subclass excludes significant computer for data processing for access control. See search class notes below.

SEE OR SEARCH CLASS:

360Dynamic Magnetic Information Storage or Retrieval,   subclass 60 for preventing recording or erasing an earlier recording on a record carrier.
380Cryptography,   subclasses 201 through 209for copy protection or prevention of video signal by cryptography.
439Electrical Connectors,   subclasses 133 through 134for unauthorized connection prevention.
455Telecommunications,   subclass 26.1 for use or access blocking of a modulated carrier wave communication in general and subclass 411 for radiotelephone with privacy or lockout.
463Amusement Devices: Games,   subclass 29 for access or authorization.
705Data Processing: Financial, Business Practice, Management, or Cost/Price Determination,   subclasses 50 through 80for business cryptography.
708Electrical Computers: Arithmetic Processing and Calculating,   subclass 135 for security.
707Data Processing: Database, Data Mining, and File Management or Data Structures,   subclasses 999.001 through 999.206and subclasses 600 through 831 for database or file management systems including significant addressing, retrieval, or manipulation of information contained within a database of a digital data processing system or computer including searching, query processing, information locating and retrieval techniques from a file or database.
711Electrical Computers and Digital Processing Systems,   subclasses 100 through 173for storage accessing and control, subclass 163 for access limiting and subclass 164 for access with password or key.
713Electrical Computers and Digital Processing Systems: Support,   subclasses 182 through 186for system access control based on user identification by cryptography.
726Information Security,   subclasses 1 through 30for information security in computers or digital processing system.
  
[List of Patents for class 340 subclass 5.8]    5.8Authentication (e.g., identity):
 This subclass is indented under subclass 5.1.  Subject matter which compares characteristics or data to determine proper validation of a user, object, or document.

SEE OR SEARCH THIS CLASS, SUBCLASS:

5.1through 5.92, for similar subject matter in authorization systems.

SEE OR SEARCH CLASS:

235Registers,   subclass 380 for identification card systems where the card is a data bearing record.
342Communications: Directive Radio Wave Systems and Devices (e.g., Radar, Radio Navigation),   subclasses 44 through 45for identification system.
348Television,   subclass 161 for the remote verification of signatures using television and having an operator making a decision as to the authenticity of the signature, where a television system is an integral part of the system.
356Optics: Measuring and Testing,   subclass 71 for optical document verification.
380Cryptography,   subclasses 23 through 25for an authentication system using encrypted transmission.
399Electrophotography,   subclass 12 for unit or part identification.
705Data Processing, Financial, Business Practice, Management, or Cost/ Price Determination,   subclass 44 for a computerized arrangement for transferring funds by debiting one account and crediting another by the same amount in which an approval is required prior to effecting a funds transfer, or subclass 67 for secure transaction cryptographic processing (e.g., EFT/ POS) including authentication.
713Electrical Computers and Digital Processing Systems: Support,   subclasses 155 through 159for multiple computer communication using cryptography having central trusted authority providing computer authentication, subclass 161 for multiple computer communication using cryptography where packet header denotes cryptographically protected data and having data authentication, and subclasses 168-181 for multiple computer communication using cryptography having particular communication authentication technique.
  
[List of Patents for class 340 subclass 5.81]    5.81Personal identification:
 This subclass is indented under subclass 5.8.  Subject matter wherein identity of an individual is validated.
(1) Note: This subclass usually pertains to system which identify an individual, and the controlled function is generally an indication of the authenticity.

SEE OR SEARCH THIS CLASS, SUBCLASS:

5.3through 5.33, for authorization control with indication of improper access

SEE OR SEARCH CLASS:

283Printed Matter,   subclasses 75 through 78for personal identification.
382Image Analysis,   subclasses 115 through 127for image analyzing for the purpose of recognizing an individual or verifying a person’s identity.
434Education and Demonstration,   subclass 155 for identification of person or handwriting analysis.
  
[List of Patents for class 340 subclass 5.82]    5.82Biometrics:
 This subclass is indented under subclass 5.81.  Subject matter wherein body characteristic is used to validate the identity of the individual.

SEE OR SEARCH THIS CLASS, SUBCLASS:

5.52through 5.53, for authorization system controlled by body characteristic.

SEE OR SEARCH CLASS:

348Television,   subclass 77 for television system adapted for human body observation.
382Image Analysis,   subclasses 115 through 127for personal identification including biometrics.
396Photography,   subclasses 14 through 18for eye, mouth or body photography.
902Electronic Funds Transfer,   subclass 3 for electronic funds transfer system having means for analyzing physical characteristic of user (e.g., fingerprint, handprint).
  
[List of Patents for class 340 subclass 5.83]    5.83Image (e.g., Fingerprint, Face):
 This subclass is indented under subclass 5.82.  Subject matter wherein the body characteristic includes pattern picturing part of the individuals body.
(1) Note. The pattern picturing part of body may be a digital representation.

SEE OR SEARCH THIS CLASS, SUBCLASS:

5.53,for authorization system controlled by image (e.g., fingerprint, face).

SEE OR SEARCH CLASS:

382Image Analysis,   subclass 115 for image or pattern analyzing for recognizing a person.
  
[List of Patents for class 340 subclass 5.84]    5.84Voice:
 This subclass is indented under subclass 5.82.  Subject matter wherein the body characteristic includes the individuals speech.

SEE OR SEARCH CLASS:

381Electrical Audio Signal Processing Systems and Devices,   appropriate subclasses for electrical transmission or processing systems for audio signals.
704Data Processing: Speech Signal Processing, Linguistics, Language Translation, and Audio Compression/Decompression,   subclasses 246 through 250for voice recognition and subclass 273 for security systems including speech signal processing.
  
[List of Patents for class 340 subclass 5.85]    5.85Password:
 This subclass is indented under subclass 5.81.  Subject matter wherein the characteristic includes user identification code for security purpose.

SEE OR SEARCH THIS CLASS, SUBCLASS:

5.54,for authorization system controlled by password.

SEE OR SEARCH CLASS:

700Data Processing: Generic Control Systems or Specific Applications,   subclass 225 for data processing article handling system having identification code, subclasses 221-222 for identification code in a plural articles handling data processing system; subclass 237 for password authorization in a computerized dispensing or vending apparatus.
705Data Processing: Financial, Business Practice, Management, or Cost/ Price Determination,   subclass 18 for a point of sale terminal having security or user identification provision (password entry, etc.).
711Electrical Computers and Digital Processing Systems: Memory,   subclass 164 for memory access control by password or key.
713Electrical Computers and Digital Processing Systems: Support,   subclass 202 for security in computer using password.
902Electronic Funds Transfer,   subclass 5 for electronic funds transfer having means to enter personal identification numbers.
  
[List of Patents for class 340 subclass 5.86]    5.86Document authentication:
 This subclass is indented under subclass 5.8.  Subject matter wherein validity of a document is determined.

SEE OR SEARCH CLASS:

250Radiant Energy,   subclasses 559.01 through 559.49for optical inspection of webs.
270Sheet-Material Associating,   appropriate subclasses for document handling subject matter.
271Sheet Feeding or Delivering,   appropriate subclasses for related subject matter.
358Facsimile and Static Presentation Processing,   subclass 488 for system in which the position of a document relative to a platen or scanning apparatus is detected.
380Crytography,   subclasses 23 through 25for record actuated authentication system.
382Image Analysis,   subclass 112 for imaging system that inspect webs, such as newspaper, etc., for proper registration of the print thereon or for inspection of the condition of a document for damage (e.g. staining, soiling) to the document.
399Electrophotography,   subclass 366 for document handling of unauthorized copy prevention.
713Electrical Computers and Digital Processing Systems: Support,   subclasses 150 through 181for multiple computer communication using cryptography.
  
[List of Patents for class 340 subclass 5.9]    5.9Commodity (e.g., vending):
 This subclass is indented under subclass 5.1.  Subject matter providing for a receipt, dispensation or count of a merchandise.

SEE OR SEARCH CLASS:

70Locks,   Dig 41 for coin controlled locks.
186Merchandising,   subclass 3 for store service with selective delivery, subclass 20 for store service with selective switches, subclasses 55-56 for store service with remote item dispensing.
235Registers,   subclass 381 for vending controlled by a data bearing record.
221Article Dispensing,   appropriate subclass, in particular subclasses 2 through 8for article dispensing device having recorder, register, indicator, signal or exhibitor.
222Dispensing,   appropriate subclass, in particular subclasses 23 through 51dispensing process including record, register, indicator or exhibitor.
700Data Processing: Generic Control Systems or Specific Applications,   subclass 237 for password authorization in a computerized dispensing or vending apparatus
705Data Processing: Financial, Business Practice, Management, or Cost/Price Determination,   subclasses 16 through 25for vending combined with a cash or credit transaction.
  
[List of Patents for class 340 subclass 5.91]    5.91Including merchandise information display system (e.g., store price display):
 This subclass is indented under subclass 5.9.  Subject matter comprising means for visually indicating an information related to the merchandise (e.g., price).

SEE OR SEARCH CLASS:

345Computer Graphics Processing and Selective Visual Display Systems,   appropriate subclasses for computer graphic processing, interfacing, or type of display system.
705Data Processing: Financial, Business Practice, Management, or Cost/Price Determination,   subclass 20 for price look up including price display in a point of sale terminal and subclasses 400-418 for cost/price determination.
708Electrical Computers: Arithmetic Processing and Calculating,   subclass 163 for a business calculator having specialized output.
  
[List of Patents for class 340 subclass 5.92]    5.92Item inventorying:
 This subclass is indented under subclass 5.9.  Subject matter includes an arrangement for establishing, maintaining, or updating a record of the merchandise.
(1) Note. An inventory system having significant data processing is classified in an external class. See search class notes below.

SEE OR SEARCH CLASS:

235Registers,   subclass 385 for system controlled by data bearing record in which a record associated with or representative of an article is sensed, and sensed data is used to compile a record of items on hand.
700Data Processing: Generic Control Systems or Specific Applications,   subclass 225 for data processing article handling system having identification code, subclass 236 for article handling inventory in a data processing system.
705Data Processing: Financial, Business Practice, Management, or Cost/Price Determination,   subclass 22 for inventory monitoring in a point of sale terminal, subclasses 28-29 inventory management in a generic business system.
  
[List of Patents for class 340 subclass 6.1]    6.1Having indication or alarm:
 This subclass is indented under subclass 1.1.  Subject matter comprising controlling an element which provides a humanly perceptible indication of the selective system operation, including operator initiated condition.

SEE OR SEARCH THIS CLASS, SUBCLASS:

3.7,and 3.71, for selective monitoring and control including an indicator.
5.3,through 5.33, for similar subject matter indicating improper access.
500,through 693.12, for similar subject matter responsive to an external condition.
  
[List of Patents for class 340 subclass 6.11]    6.11Additional to other selective control:
 This subclass is indented under subclass 6.1.  Subject matter wherein another control function is performed in addition to the alarm or indication.

SEE OR SEARCH THIS CLASS, SUBCLASS:

5.3,through 5.33, when the other control function is an access control function operated alternatively to the indication.
7.1,for paging to control diverse device.
7.2,through 7.63, for a selective paging system.
  
[List of Patents for class 340 subclass 6.12]    6.12Party line:
 This subclass is indented under subclass 6.1.  Subject matter comprising a signaling system whereby a large number of stations may be individually signaled over a limited number of wires.

SEE OR SEARCH CLASS:

178Telegraphy,   appropriate subclasses for telegraphy information processing.
246Railway Switches and Signals,   subclasses 2+ for train dispatching.
379Telephonic Communications,   appropriate subclassesfor telephonic information processing, particularly subclasses 177-187.
  
[List of Patents for class 340 subclass 6.13]    6.13Selection by means of frequency:
 This subclass is indented under subclass 6.12.  Subject matter wherein the indicator is actuated by means of a cyclic current of a frequency peculiar to the selected indicator.
  
[List of Patents for class 340 subclass 6.14]    6.14Selector or indicator, per se:
 This subclass is indented under subclass 6.12.  Subject matter limited, in extent, to the station selector or indicating mechanism for a party-line system.
  
[List of Patents for class 340 subclass 6.15]    6.15Step-by-step impulse:
 This subclass is indented under subclass 6.12.  Subject matter wherein the selected indicator is actuated in accordance with the number of transmitted impulses.
  
[List of Patents for class 340 subclass 6.16]    6.16Polarity controlled:
 This subclass is indented under subclass 6.15.  Subject matter wherein selection is based on whether the pulses are of positive or negative amplitude with respect to ground.
  
[List of Patents for class 340 subclass 6.17]    6.17Amplitude or polarity controlled:
 This subclass is indented under subclass 6.12.  Subject matter wherein the indicator is selected by means of the amplitude or polarity of a current.
  
[List of Patents for class 340 subclass 7.1]    7.1Paging to control diverse device:
 This subclass is indented under subclass 6.1.  Subject matter wherein a control signal provides commands to control a device in addition to providing a paging indication to a user.

SEE OR SEARCH THIS CLASS, SUBCLASS:

5.1,through 5.92, for control in response to an information bearing item, particularly security-related control, subclass 6.11 for selective control in addition to indication or alarm, and subclasses 7.2-7.63 for selective paging systems including subclasses 7.33-7.36 for power control or battery saving of a selective paging device based on a received signal.
  
[List of Patents for class 340 subclass 7.2]    7.2Code responsive (i.e., paging):
 This subclass is indented under subclass 6.1.  Subject matter wherein the indication at a selective call receiver (SCR) is controlled or actuated in accordance with a predetermined control signal.
(1) Note. These systems are generally characterized by terminals which receive requests for indication (and organize those requests) and transmitter base stations which communicate such a request in the form of a predetermined control signal to a selective call receiver (SCR).
(2) Note. A paging signal generally is the communication between a transmitter base station and an SCR.
(3) Note. SCRs are also known as pagers, paging receivers, or beepers etc.

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7.1,for paging to control diverse device.
311.2,for nonselective call paging (e.g. public address system).

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370Multiplex Communications,   subclasses 310 through 350for multiplex communication over free space, particularly subclasses 313-314 for specific multiplex communication including a portable address responsive receiver.
375Pulse or Digital Communications,   appropriate subclasses for a paging device combined with a digital communication system.
379Telephonic Communications,   subclass 88.15 for telephonic communication including audio message storage, retrieval, or synthesis having multimedia system pager activation and FOR 101 for an art collection related to telephonic communication having electromagnetic link for speech or paging signal (e.g., light wave link).
455Telecommunications,   particularly foreign/nonpatent literature of subclasses 701 through 703for similar subject matter involving tone coded squelch and subclass 228 for a telecommunications receiver combined with a paging device.
  
[List of Patents for class 340 subclass 7.21]    7.21Two-way paging:
 This subclass is indented under subclass 7.2.  Subject matter wherein the SCR may additionally transmit information back to the paging terminal.
(1) Note. The information transmitted from the SCR to the paging terminal generally is relayed in some manner through the transmitter base station. Ack-Back pagers and Reply pagers are classified here.
  
[List of Patents for class 340 subclass 7.22]    7.22Acknowledgment of message receipt:
 This subclass is indented under subclass 7.21.  Subject matter wherein the response from the pager is an indication that a paging signal has been received by the paging terminal.
  
[List of Patents for class 340 subclass 7.23]    7.23Including reply to query:
 This subclass is indented under subclass 7.22.  Subject matter wherein the response from the pager is an answer to a question posed in the paging signal received by the paging terminal.
  
[List of Patents for class 340 subclass 7.24]    7.24Transmitting configuration:
 This subclass is indented under subclass 7.2.  Subject matter wherein a specific transmitter base station arrangement is used to relay the control signal from the paging terminal to the SCR.
  
[List of Patents for class 340 subclass 7.25]    7.25Multiple transmitters:
 This subclass is indented under subclass 7.24.  Subject matter wherein a plurality of transmitter base stations are used to communicate the control signal to the SCR.
  
[List of Patents for class 340 subclass 7.26]    7.26Simulcast:
 This subclass is indented under subclass 7.25.  Subject matter wherein the plurality of transmitter base stations are synchronized to transmit the same control signal at the same time.
  
[List of Patents for class 340 subclass 7.27]    7.27Zoned:
 This subclass is indented under subclass 7.25.  Subject matter wherein each of a plurality of transmitter base stations is arranged to cover a specific geographical area.

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370Multiplex Communications,   subclasses 328 through 338for multiplex communication over free space involving plural contiguous regions.
455Telecommunications,   subclasses 422.1 through 460for zoned or cellular telephone systems.
  
[List of Patents for class 340 subclass 7.28]    7.28Paging terminal (i.e., element prior to the transmitter):
 This subclass is indented under subclass 7.2.  Subject matter wherein a specific interface between the requesting user and the transmitter base station is used to organize requests and control signals.
  
[List of Patents for class 340 subclass 7.29]    7.29Terminal connected to other network:
 This subclass is indented under subclass 7.28.  Subject matter wherein the paging terminal receives requests for indication from a communication system other than just the PSTN.

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379Telephonic Communications,   subclasses 90.01 through 108.02for a telephone system combined with diverse electrical system or signaling.
709Electrical Computers and Digital Processing Systems: Multicomputer Data Transferring,   appropriate subclassesfor plural computer communications.
  
[List of Patents for class 340 subclass 7.3]    7.3Queuing:
 This subclass is indented under subclass 7.28.  Subject matter wherein the paging terminal effects the order in which received requests are sent as paging messages to the SCRs.
  
[List of Patents for class 340 subclass 7.31]    7.31Message input:
 This subclass is indented under subclass 7.28.  Subject matter wherein the paging terminal includes devices which are used to generate paging messages based upon received requests.
  
[List of Patents for class 340 subclass 7.32]    7.32Power control or battery saving:
 This subclass is indented under subclass 7.2.  Subject matter wherein the SCR s power consumption is regulated or reduced.

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323Electricity: Power Supply or Regulation Systems,   appropriate subclasses for generic power supply regulation.
370Multiplex Communications,   subclass 311 for multiplex signaling for performing battery saving.
455Telecommunications,   subclasses 127.1 through 127.5for power supply of transmitter, subclass 343.1-343.6 for power supply of receiver, and subclasses 572-574 for power supply of radiotelephone.
713Electrical Computers and Digital Processing Systems: Support,   subclasses 300 through 340for computer power control.
  
[List of Patents for class 340 subclass 7.33]    7.33Based on received signal:
 This subclass is indented under subclass 7.32.  Subject matter wherein the SCR s power consumption is regulated or reduced in response to a received signal.
  
[List of Patents for class 340 subclass 7.34]    7.34Frame based timing:
 This subclass is indented under subclass 7.33.  Subject matter wherein the power control circuit in the SCR operates in response to timing information derived from received packetized data.

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7.45,for paging address format in general.
  
[List of Patents for class 340 subclass 7.35]    7.35Address based:
 This subclass is indented under subclass 7.33.  Subject matter wherein the power control circuit in the SCR operates in response to its identifier in a received control signal.
  
[List of Patents for class 340 subclass 7.36]    7.36Received signal includes power command:
 This subclass is indented under subclass 7.32.  Subject matter wherein the received signal includes an instruction to the SCR s power saving circuit.
  
[List of Patents for class 340 subclass 7.37]    7.37Control based upon available power:
 This subclass is indented under subclass 7.32.  Subject matter wherein the SCR s power consumption is regulated or reduced in response to the amount of power remaining in the SCR s power supply.

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636.1through 636.21 , for battery condition responsive indicating system.
  
[List of Patents for class 340 subclass 7.38]    7.38Time based:
 This subclass is indented under subclass 7.32.  Subject matter wherein the power control circuit in the SCR is responsive to a fixed time schedule.
  
[List of Patents for class 340 subclass 7.39]    7.39Programming the receiver:
 This subclass is indented under subclass 7.2.  Subject matter wherein a control signal which can be used by the SCR to effect the future operation of the SCR is supplied thereto.
  
[List of Patents for class 340 subclass 7.4]    7.4Via local device:
 This subclass is indented under subclass 7.39.  Subject matter wherein the programming control signal is delivered to the SCR from a nearby device.
  
[List of Patents for class 340 subclass 7.41]    7.41Over the air:
 This subclass is indented under subclass 7.39.  Subject matter wherein the programming control signal is delivered to the SCR via the same communication system as the indication control signals.
  
[List of Patents for class 340 subclass 7.42]    7.42Frequency scanning for address:
 This subclass is indented under subclass 7.2.  Subject matter wherein the SCR scans plural frequencies in search of a message to itself.

SEE OR SEARCH CLASS:

455Telecommunications,   subclass 434 for cellular access channel scanning.
  
[List of Patents for class 340 subclass 7.43]    7.43Particular message and address format (e.g., POCSAG, FLEX, etc.):
 This subclass is indented under subclass 7.2.  Subject matter wherein a specific protocol is used to communicate a control signal and selecting code.

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7.45,for particular addressing format.

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341Coded Data Generation or Conversion,   appropriate subclasses for various types of conversion between codes.
  
[List of Patents for class 340 subclass 7.44]    7.44Having error detection or correction:
 This subclass is indented under subclass 7.43.  Subject matter wherein an error in the communication of the control signal is detected which may be subsequently corrected.
(1) Note. Error correction and error indication are classified here.

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714Error Detection/Correction and Fault Detection/Recovery,   appropriate subclasses for generic error detection or correction.
  
[List of Patents for class 340 subclass 7.45]    7.45Addressing format:
 This subclass is indented under subclass 7.2.  Subject matter wherein a specific selecting code is used to direct a control signal to a specific SCR.

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7.34,for power control or battery saving based on address.
7.43,through 7.48, for particular message and address format.
9.1,through 9.17, for selective addressing, in general.
  
[List of Patents for class 340 subclass 7.46]    7.46Group call:
 This subclass is indented under subclass 7.45.  Subject matter including plural SCRs each actuated by a signal unique thereto, and each also responsive to a signal which actuates a plurality of SCRs.
(1) Note. The group call signal may actuate all or a subset of SCRs in the system.
  
[List of Patents for class 340 subclass 7.47]    7.47Source address:
 This subclass is indented under subclass 7.46.  Subject matter wherein plural indicating devices realize that a message is intended for each indicating device based on a code which designates the sender of the message to be indicated.
  
[List of Patents for class 340 subclass 7.48]    7.48News information provider (e.g., sports, weather, etc.):
 This subclass is indented under subclass 7.46.  Subject matter wherein the user requesting the indication sends or initiates a control signal which indicates the status of a particular newsworthy subject.

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4.5,and 4.51, for selective stock quotation.
  
[List of Patents for class 340 subclass 7.49]    7.49Tone code (i.e., frequency code):
 This subclass is indented under subclass 7.45.  Subject matter wherein the control signal is a predetermined pattern of successive audio frequency modulated signals.
(1) Note. The successive signals may include one or more frequencies, but a single modulated signal is not classified herein.

SEE OR SEARCH CLASS:

375Pulse or Digital Communications,   subclass 239 for pulse frequency modulation communication.
  
[List of Patents for class 340 subclass 7.5]    7.5Distress signal:
 This subclass is indented under subclass 7.2.  Subject matter responsive to the receipt of signals having standardized characteristics representing an emergency type situation from any transmitter.
(1) Note. The signals are often indications of nautical vessels in distress, such as the "SOS" or standard international distress signal.
  
[List of Patents for class 340 subclass 7.51]    7.51Message presentation:
 This subclass is indented under subclass 7.2.  Subject matter wherein the indication is a perceptible announcement of information.
(1) Note. Paging alerts are classified elsewhere.

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7.58through 7.62, for paging alerts.

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345Computer Graphics Processing and Selective Visual Display Systems,   appropriate subclasses for computer graphics display processing.
  
[List of Patents for class 340 subclass 7.52]    7.52Storing or retrieving message (e.g., received message database handling):
 This subclass is indented under subclass 7.51.  Subject matter wherein the message is saved in a memory area for future recall.
(1) Note. Handling or searching stored messages is classified here.

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707Data Processing: Database, Data Mining, and File Management or Data Structures,   subclasses 705 through 789for database and file access, subclasses 821 through 831 for file management.
  
[List of Patents for class 340 subclass 7.53]    7.53Canned message (audible or visual):
 This subclass is indented under subclass 7.51.  Subject matter wherein a message is communicated in the control signal using a code representing the message (or a portion thereof).
  
[List of Patents for class 340 subclass 7.54]    7.54Via externally coupled device:
 This subclass is indented under subclass 7.51.  Subject matter wherein the message is presented via a separate device connected to the SCR.
  
[List of Patents for class 340 subclass 7.55]    7.55Display:
 This subclass is indented under subclass 7.51.  Subject matter wherein the message is presented via a visual element.

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345Computer Graphics Processing and Selective Visual Display Systems,   appropriate subclasses for a selective visual display in general.
  
[List of Patents for class 340 subclass 7.56]    7.56Including graphics:
 This subclass is indented under subclass 7.55.  Subject matter wherein the displayed message includes a pictorial image.
(1) Note. Graphics here include icons.

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345Computer Graphics Processing and Selective Visual Display Systems,   appropriate subclasses for computer graphics.
  
[List of Patents for class 340 subclass 7.57]    7.57Audible:
 This subclass is indented under subclass 7.51.  Subject matter wherein the message is presented using a sound producing element.

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7.62,for an audible paging alert.
384.1through 404.3, for an electrical audible indicator in general.

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381Electrical Audio Signal Processing Systems and Devices,   appropriate subclasses for audio signal processing in general.
  
[List of Patents for class 340 subclass 7.58]    7.58Alert:
 This subclass is indented under subclass 7.2.  Subject matter including a humanly perceptible indication that a specific control signal has been received.
  
[List of Patents for class 340 subclass 7.59]    7.59Priority alert:
 This subclass is indented under subclass 7.58.  Subject matter wherein the alert is indicative of the order of importance of the received control signal.
  
[List of Patents for class 340 subclass 7.6]    7.6Vibratory (i.e., tactual) alarm:
 This subclass is indented under subclass 7.58.  Subject matter wherein the indicating element produces a shaking vibration which is felt rather than heard.
(1) Note. The vibration is generally in the subaudible range.

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407.1through 407.2, for tactual signals, per se.
  
[List of Patents for class 340 subclass 7.61]    7.61Visual:
 This subclass is indented under subclass 7.58.  Subject matter wherein the alert indicating element produces a visible indication.

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815.4through 815.92, for electrical visual indicators in general.
  
[List of Patents for class 340 subclass 7.62]    7.62Audible:
 This subclass is indented under subclass 7.58.  Subject matter wherein the alert indicating element produces a noise that is heard.

SEE OR SEARCH THIS CLASS, SUBCLASS:

7.57,for audible paging message presentation.
384.1through 404.3, for electrical audible indicators in general.
  
[List of Patents for class 340 subclass 7.63]    7.63Housing detail:
 This subclass is indented under subclass 7.2.  Subject matter wherein a specific structure encases the SCR.

SEE OR SEARCH CLASS:

361Electricity: Electrical Systems and Devices,   subclasses 814 through 815for radio type housings.
455Telecommunications,   subclass 90.3 for a telecommunication transceiver housing, subclass 128 for a telecommunication transmitter housing, subclasses 347-351 for a telecommunication receiver housing, and subclasses 575.1-575.9 for a radiotelephone housing.
  
[List of Patents for class 340 subclass 8.1]    8.1Location indication:
 This subclass is indented under subclass 6.1.  Subject matter which produces a signal indicative of the location of a signal transmitting or receiving device or station.
  
[List of Patents for class 340 subclass 9.1]    9.1Addressing:
 This subclass is indented under subclass 1.1.  Subject matter with a plurality of controlled devices at distinct locations, each one of which is responsive to a signal having a unique characteristic corresponding to the respective one of the controlled devices.
(1) Note. The term "unique characteristics" refers to a parameter, the content, or the relative time of occurrence of the signal.

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3.5,through 3.55, for addressing in a monitoring and control (e.g., supervisory, etc.) system.
4.21,for synchronizing with addressing.
7.45,through 7.49, for addressing format of a paging device.

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711Electrical Computers and Digital Processing Systems: Memory,   subclasses 1 through 6for addressing combined with specific memory configurations (e.g., extended, expanded, dynamic, etc.), subclasses 100-173 for generalized storage accessing and control in a digital data processing system, and subclasses 200-221 for generalized address forming.
  
[List of Patents for class 340 subclass 9.11]    9.11Group addressing:
 This subclass is indented under subclass 9.1.  Subject matter having plural controlled devices at distinct locations, wherein each device is responsive to a unique signal and each device is also responsive to a signal which actuates the plurality of devices.
  
[List of Patents for class 340 subclass 9.12]    9.12Asynchronous:
 This subclass is indented under subclass 9.1.  Subject matter wherein plural unique actuating signals are not occurring at the same time or having the same period or phase.
  
[List of Patents for class 340 subclass 9.13]    9.13Multiple discrete addresses:
 This subclass is indented under subclass 9.12.  Subject matter wherein the unique actuating signal comprises a plurality of separate addresses.
  
[List of Patents for class 340 subclass 9.14]    9.14Packet data:
 This subclass is indented under subclass 9.12.  Subject matter wherein plural unique actuating signals are bundled to form a message.
  
[List of Patents for class 340 subclass 9.15]    9.15Including source address:
 This subclass is indented under subclass 9.1.  Subject matter wherein the unique actuating signal comprises the destination address and the source address.
  
[List of Patents for class 340 subclass 9.16]    9.16Programming of the address:
 This subclass is indented under subclass 9.1.  Subject matter wherein the addressing is being performed in a predetermined sequence.
  
[List of Patents for class 340 subclass 9.17]    9.17Plural part (e.g., digit, etc.) or repetitions:
 This subclass is indented under subclass 9.1.  Subject matter wherein the unique actuating signal either (a) has plural successively transmitted components or (b) is repetitively transmitted for comparison of the repeated transmissions.
  
[List of Patents for class 340 subclass 10.1]    10.1Interrogation response (e.g., RFID, etc.):
 This subclass is indented under subclass 1.1.  Subject matter having an information containing device and an information source control device for querying the information containing device, with the expectation of an immediate reply.

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3.51,for selective monitoring and control including addressing with polling or roll call.
4.5,and 4.51, for such subject matter for interrogation and display of stock prices.
4.6,through 4.62, for such subject matter for interrogation and display of space allocation information.
5.61,through 5.63, for transponders used for access control.
7.21,through 7.23, for two-way paging in selective communications.
505,for interrogator-responder in a condition responsive indicating system with particular system function.
572.1through 572.9, for condition responsive detecting a detectable device on a protected article.
870.28,and 870.29, for continuously variable indicating via radiant energy, and subclass 870.32 via mutual inductance.

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235Registers,   subclasses 375 through 386for systems controlled by data bearing records which may include interrogation response system or device.
342Communications: Directive Radio Wave Systems and Devices (e.g., Radar, Radio Navigation),   subclasses 42 through 51for transponder system using radar.
455Telecommunications,   subclass 41.1 for near field communication and subclass 106 for modulation by absorption, shielding, or reflecting.
  
[List of Patents for class 340 subclass 10.2]    10.2Contention avoidance:
 This subclass is indented under 10.1.  including means to enable an interrogation controller to receive responses from multiple information containing devices relatively error free.

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370Multiplex Communications,   subclasses 229 through 240for data flow congestion prevention or control in a multiplex communications network.
  
[List of Patents for class 340 subclass 10.3]    10.3Interrogation signal detail:
 This subclass is indented under 10.1.  wherein an interrogation signal having designated characteristics is sent from the source controller.
  
[List of Patents for class 340 subclass 10.31]    10.31Individual call:
 This subclass is indented under 10.3.  wherein the interrogation signal uniquely identifies a specific information containing device.
  
[List of Patents for class 340 subclass 10.32]    10.32Group call:
 This subclass is indented under 10.3.  wherein the interrogation signal identifies a group of information containing devices.
  
[List of Patents for class 340 subclass 10.33]    10.33Wake up (all call):
 This subclass is indented under 10.3.  wherein the specific interrogation signal initiates a response from all information containing devices within range.
  
[List of Patents for class 340 subclass 10.34]    10.34Power up:
 This subclass is indented under 10.3.  wherein the interrogation signal provides energy to all information containing devices.
  
[List of Patents for class 340 subclass 10.4]    10.4Response signal detail:
 This subclass is indented under 10.1.  wherein a specific response signal is sent from the information containing device.
  
[List of Patents for class 340 subclass 10.41]    10.41Combination response:
 This subclass is indented under 10.4.  wherein the response signal is a composite signal including multiple type of information.
  
[List of Patents for class 340 subclass 10.42]    10.42Identification only:
 This subclass is indented under 10.4.  wherein the response signal includes the unique identity of the information containing device.
  
[List of Patents for class 340 subclass 10.5]    10.5Additional control:
 This subclass is indented under 10.1.  wherein a subsequent operation is performed in response to the interrogation signal.
  
[List of Patents for class 340 subclass 10.51]    10.51Programming (e.g., read/write):
 This subclass is indented under 10.5.  wherein the subsequent operation is the writing of data into the information containing device.
  
[List of Patents for class 340 subclass 10.52]    10.52ID code:
 This subclass is indented under 10.51.  wherein the data written is a unique identification of the information containing device.
  
[List of Patents for class 340 subclass 10.6]    10.6Printout or display:
 This subclass is indented under 10.1.  including an information presenting device for forming a permanent or semipermanent record of the information.
  
[List of Patents for class 340 subclass 11.1]    11.1With multidigit encoder:
 This subclass is indented under subclass 1.1.  Subject matter including a code generator to produce a control signal which includes plural signals, each corresponding to a digit.
(1) Note. Examples are encoders producing plural dial pulses or tone code signals.

SEE OR SEARCH THIS CLASS, SUBCLASS:

9.17,for similar subject matter for addressing one of plural-controlled devices.
12.15,through 12.55, for control by a digital signal, in general.

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341Coded Data Generation or Conversion,   subclasses 20 through 35for a keyboard-controlled code transmitter.
  
[List of Patents for class 340 subclass 12.1]    12.1Pulse responsive actuation:
 This subclass is indented under subclass 1.1.  Subject matter wherein the control signal is an abrupt variation in a voltage or current.

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11.1,for such subject matter including a plurality of pulse sequences.
  
[List of Patents for class 340 subclass 12.11]    12.11Phase or frequency shift keying:
 This subclass is indented under subclass 12.1.  Subject matter wherein the control signal variation is a shift in the instantaneous frequency thereof.

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13.2,through 13.36, for control by a signal frequency variation, in general.

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375Pulse or Digital Communications,   subclasses 272 through 278for frequency shift keying in communication systems for messages of arbitrary content.
  
[List of Patents for class 340 subclass 12.12]    12.12Polarity:
 This subclass is indented under subclass 12.1.  Subject matter wherein the variation is either one of plural potentials separated by a reference potential, or a change in direction of current flow.
  
[List of Patents for class 340 subclass 12.13]    12.13Pulse pairs:
 This subclass is indented under subclass 12.1.  Subject matter wherein the signal is transmitted by pairs of pulses, a composite or differential parameter of which performs the control function.
(1) Note. The term "composite or differential parameter" denotes a parameter involving both pulses (e.g., time or amplitude difference, etc.).
  
[List of Patents for class 340 subclass 12.14]    12.14Having delay line:
 This subclass is indented under subclass 12.1.  Subject matter including an element which retards the progress of a pulse.
  
[List of Patents for class 340 subclass 12.15]    12.15Serial:
 This subclass is indented under subclass 12.1.  Subject matter wherein the control signal includes a group of consecutive or successive distinct pulses.

SEE OR SEARCH THIS CLASS, SUBCLASS:

9.17,for similar subject matter for addressing one of plural-controlled devices.
11.1,for similar subject matter combined with a multidigit encoder.
  
[List of Patents for class 340 subclass 12.16]    12.16Pulse width:
 This subclass is indented under subclass 12.15.  Subject matter wherein the control is performed in accordance with the duration of the pulse.
  
[List of Patents for class 340 subclass 12.17]    12.17Pulse spacing (e.g., pulse repetition rate, etc.):
 This subclass is indented under subclass 12.15.  Subject matter wherein the control is performed in accordance with the interval between pulses.
  
[List of Patents for class 340 subclass 12.18]    12.18Counting:
 This subclass is indented under subclass 12.15.  Subject matter wherein the control is performed in accordance with the number of pulses in the group.
  
[List of Patents for class 340 subclass 12.19]    12.19Relay:
 This subclass is indented under subclass 12.18.  Subject matter wherein a series of relays are used to count the number of pulses in a group.
  
[List of Patents for class 340 subclass 12.2]    12.2Counting chain:
 This subclass is indented under subclass 12.18.  Subject matter having plural successively connected counting stages.
  
[List of Patents for class 340 subclass 12.21]    12.21Shift register:
 This subclass is indented under subclass 12.15.  Subject matter having a storage register with a series of stages in which the stored information may be shifted by pulses.
  
[List of Patents for class 340 subclass 12.22]    12.22Remote control:
 This subclass is indented under subclass 12.15.  Subject matter in which the pulse signal is being sent from a location geographically separated from the device being controlled.

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341Coded Data Generation or Conversion,   subclass 176 for a remote control radio transmitter.
  
[List of Patents for class 340 subclass 12.23]    12.23Programming:
 This subclass is indented under subclass 12.22.  Subject matter comprising storing a predetermined series of instructions for later retrieving and executing to carry out the remote control function.
  
[List of Patents for class 340 subclass 12.24]    12.24Operator initiated:
 This subclass is indented under subclass 12.23.  Subject matter wherein an operator initiates the programming.
  
[List of Patents for class 340 subclass 12.25]    12.25Download through data network:
 This subclass is indented under subclass 12.23.  Subject matter wherein the series of instructions is downloaded through a network of send/receive data terminals.
  
[List of Patents for class 340 subclass 12.26]    12.26Download through distribution network:
 This subclass is indented under subclass 12.23.  Subject matter wherein the series of instructions is downloaded through a central sender network.
  
[List of Patents for class 340 subclass 12.27]    12.27Enable/disable (e.g., kill machine signal, etc.):
 This subclass is indented under subclass 12.23.  Subject matter wherein programming comprising storing a predetermined series of instructions for later retrieving and executing to enable or disable a device.
  
[List of Patents for class 340 subclass 12.28]    12.28Programming a controller:
 This subclass is indented under subclass 12.23.  Subject matter comprising programming a controller to perform one or more control functions.
  
[List of Patents for class 340 subclass 12.29]    12.29Programming an appliance:
 This subclass is indented under subclass 12.23.  Subject matter comprising programming a device for home or office use to perform a specific function when receiving the control signal.
  
[List of Patents for class 340 subclass 12.3]    12.3Diverse delivery media (e.g., wired and wireless, etc.):
 This subclass is indented under subclass 12.22.  Subject matter wherein communication is over more than one type of link in response to a control pulse signal.
  
[List of Patents for class 340 subclass 12.31]    12.31Wired:
 This subclass is indented under subclass 12.22.  Subject matter wherein the pulse signal is sent over a wire.
  
[List of Patents for class 340 subclass 12.32]    12.32Power line (PLC):
 This subclass is indented under subclass 12.31.  Subject matter wherein the control pulse signal is sent from one point to the other in a system by means of an existing electrical utility supply line in the system to control various devices connecting to that line.
(1) Note. The system may be an electric street light system wherein control signals are sent over its conductors.
(2) Note. The information signal may be an address or a code signal.
(3) Note. Existing power line in this subclass comprises AC power supply (e.g., residential power of 110-240 volts, etc.) or DC power supply (e.g., power supply in the vehicle or sprinkler system, etc.).
(4) Note. Various devices in this subclass may comprise various appliances (e.g., TV tuner, radio tuner, toaster, lighting, or printer, etc.).

SEE OR SEARCH THIS CLASS, SUBCLASS:

288,through 290, for a signal box system combined with alarm circuit over power line.
320,for signaling systems having electrical signal sent along a fluid conduit.
538,through 538.17, for condition responsive alarm over power line.
568.3,for condition responsive, detecting the placement or removal of an article by sending alarm signal over a power cord.

SEE OR SEARCH CLASS:

246Railway Switches and Signals,   subclasses 1+ and 2+ for communication and signaling to control of train movements, particularly subclass 3 for inductive communication using the conducting rails.
307Electrical Transmission or Interconnection Systems,   appropriate subclasses for electrical transmission over power line without remote control, particularly subclass 3 for transmission of different frequencies or phases, subclasses 38-41 for selectively connected or controlled load circuits, subclass 104 for coupling to highly inductive system, and subclass 140 for power circuit controlled switch actuation.
333Wave Transmission Lines and Networks,   subclass 17.3 , 32-35, and 124-131 for impedance matching without communication; and subclasses 24+ for coupling networks which may include inductive coupling.
375Pulse or Digital Communications,   subclasses 257 through 260for generic digital communications over a conductor which may be a power line without any remote control of various devices as defined above.
455Telecommunications,   subclass 41.1 for near field communication which includes inductive or capacitive coupling, subclass 270 for a radio receiver using the power line as wave collector, and subclass 402 for single channel radio telephone carrier over power line.
700Data Processing: Generic Control Systems or Specific Applications,   appropriate subclasses for remote control over electrical conductors with significant computer data processing, particularly subclass 22 and 286-298 for controlling electrical power distribution, and subclass 276 for controlling the air conditioning system.
725Interactive Video Distribution Systems,   subclass 79 for local video distribution system using existing power network, subclass 130 for video distribution system with upstream communication using power signal over network, and subclass 150 for one-way video distribution system using power signal over network.
  
[List of Patents for class 340 subclass 12.33]    12.33Modulation technique:
 This subclass is indented under subclass 12.32.  Subject matter including details of technique for impressing a signal onto a carrier waveform for transmission over a power line.
(1) Note. The carrier can be a direct current or an alternating current.
  
[List of Patents for class 340 subclass 12.34]    12.34Noise reduction (e.g., filtering, etc.):
 This subclass is indented under subclass 12.32.  Subject matter wherein a circuit is provided to compensate for signal defects.
  
[List of Patents for class 340 subclass 12.35]    12.35Zero crossing:
 This subclass is indented under subclass 12.34.  Subject matter including means to extract information from its carrier wave at a region close to the zero crossing point of the carrier wave.
  
[List of Patents for class 340 subclass 12.36]    12.36Impedance matching (e.g., Y-match or delta match, etc.):
 This subclass is indented under subclass 12.32.  Subject matter wherein a circuit is provided to make the impedance of a line terminal equal to the impedance of a circuit to which it is connected in order to achieve optimum signal transfer.

SEE OR SEARCH CLASS:

333Wave Transmission Lines and Networks,   subclass 17.3 , 32-35, and 124-131 for impedance matching without communication.
  
[List of Patents for class 340 subclass 12.37]    12.37Bi-directional (e.g., with transceiver, etc.):
 This subclass is indented under subclass 12.32.  Subject matter including a communicating terminal which can transmit and receive signals.
  
[List of Patents for class 340 subclass 12.38]    12.38With inductive coupling (e.g., transformer or torroid, etc.):
 This subclass is indented under subclass 12.32.  Subject matter wherein information on the power line is transferred to or from a terminal through a mutual or common inductance.

SEE OR SEARCH CLASS:

333Wave Transmission Lines and Networks,   subclasses 24+ for coupling networks which may include inductive coupling.
  
[List of Patents for class 340 subclass 12.39]    12.39With coupling plug:
 This subclass is indented under subclass 12.32.  Subject matter wherein information on the power line is transferred to or from a terminal through a connector.
  
[List of Patents for class 340 subclass 12.4]    12.4Data network:
 This subclass is indented under subclass 12.31.  Subject matter wherein the pulse signal is sent over a network of send/receive data terminals.
  
[List of Patents for class 340 subclass 12.5]    12.5Radio:
 This subclass is indented under subclass 12.22.  Subject matter wherein communication includes transmission and reception of an electromagnetic wave.
  
[List of Patents for class 340 subclass 12.51]    12.51RFID:
 This subclass is indented under subclass 12.5.  Subject matter wherein communication includes transmission and reception of a radio identification signal.
  
[List of Patents for class 340 subclass 12.52]    12.52Plural devices:
 This subclass is indented under subclass 12.22.  Subject matter wherein more than one device is being controlled.
  
[List of Patents for class 340 subclass 12.53]    12.53Diverse devices:
 This subclass is indented under subclass 12.52.  Subject matter wherein each device performs a different function.
  
[List of Patents for class 340 subclass 12.54]    12.54Indicator or display:
 This subclass is indented under subclass 12.22.  Subject matter comprises generating a human perceptible indicating signal.
  
[List of Patents for class 340 subclass 12.55]    12.55Housing or casing:
 This subclass is indented under subclass 12.22.  Subject matter having details of the housing or casing of a device.
  
[List of Patents for class 340 subclass 13.1]    13.1Phase responsive actuation:
 This subclass is indented under subclass 1.1.  Subject matter wherein the control signal includes a phase variation in an alternating current.
  
[List of Patents for class 340 subclass 13.2]    13.2Frequency responsive actuation:
 This subclass is indented under subclass 1.1.  Subject matter wherein the control signal is a frequency variation in an alternating current.

SEE OR SEARCH CLASS:

367Communications, Electrical: Acoustic Wave Systems and Devices,   subclass 199 for frequency responsive actuation over acoustic media.
  
[List of Patents for class 340 subclass 13.21]    13.21Programming:
 This subclass is indented under subclass 13.2.  Subject matter comprising storing a predetermined series of instructions for later retrieving and executing to carry out the frequency responsive actuation function.
  
[List of Patents for class 340 subclass 13.22]    13.22Diverse delivery media (e.g., wired and wireless, etc.):
 This subclass is indented under subclass 13.2.  Subject matter wherein communication is over more than one type of link in response to a frequency actuation signal.
  
[List of Patents for class 340 subclass 13.23]    13.23Power line (PLC):
 This subclass is indented under subclass 13.2.  Subject matter wherein the frequency responsive actuation is sent over an electrical utility supply line.
  
[List of Patents for class 340 subclass 13.24]    13.24Wireless link:
 This subclass is indented under subclass 13.2.  Subject matter wherein communication includes wireless transmission or reception of signals (e.g., radio wave, near field, optical, etc.).
(1) Note. The term "near field" refers to capacitive or inductive coupling, rather than an electromagnetic wave.

SEE OR SEARCH CLASS:

398Optical Communications,   subclasses 106 through 114for remote control with significant details of optical communication system.
455Telecommunications,   subclass 41.1 for a modulated near field communication system.
  
[List of Patents for class 340 subclass 13.25]    13.25Radio:
 This subclass is indented under subclass 13.24.  Subject matter wherein communication includes transmission and reception of a radio wave.
  
[List of Patents for class 340 subclass 13.26]    13.26RFID:
 This subclass is indented under subclass 13.25.  Subject matter wherein communication includes transmission and reception of a radio identification signal.
  
[List of Patents for class 340 subclass 13.27]    13.27Plural frequencies:
 This subclass is indented under subclass 13.24.  Subject matter includes transmitting plural control signals, each having a different frequency.
  
[List of Patents for class 340 subclass 13.28]    13.28Simultaneous:
 This subclass is indented under subclass 13.27.  Subject matter wherein more than one control signal are transmitted at the same time.
  
[List of Patents for class 340 subclass 13.29]    13.29Permutation:
 This subclass is indented under subclass 13.27.  Subject matter wherein the control is performed in accordance with the sequence of distinct control signal frequencies transmitted.
  
[List of Patents for class 340 subclass 13.3]    13.3Corresponding to distinct functions:
 This subclass is indented under subclass 13.27.  Subject matter wherein each of the different control signal frequencies causes a different operation of the controlled device.
  
[List of Patents for class 340 subclass 13.31]    13.31Indicator or display:
 This subclass is indented under subclass 13.24.  Subject matter comprises generation of a human perceptive indicating signal.
  
[List of Patents for class 340 subclass 13.32]    13.32Housing or casing:
 This subclass is indented under subclass 13.24.  Subject matter having details of the housing or casing of a device.
  
[List of Patents for class 340 subclass 13.33]    13.33Plural frequencies:
 This subclass is indented under subclass 13.2.  Subject matter comprising transmitting plural control signals, each having a different frequency.
  
[List of Patents for class 340 subclass 13.34]    13.34Simultaneous:
 This subclass is indented under subclass 13.33.  Subject matter wherein more than one control signal is transmitted at the same time.
  
[List of Patents for class 340 subclass 13.35]    13.35Permutation:
 This subclass is indented under subclass 13.33.  Subject matter wherein control is performed in accordance with the sequence of distinct control signal frequencies transmitted.
  
[List of Patents for class 340 subclass 13.36]    13.36Corresponding to distinct functions:
 This subclass is indented under subclass 13.33.  Subject matter wherein each of the different control signal frequencies causes a different operation of the controlled device.
  
[List of Patents for class 340 subclass 13.37]    13.37Amplitude responsive actuation:
 This subclass is indented under subclass 1.1.  Subject matter wherein the controlled device is activated in response to the variation in the electrical current strength of the control signal.
  
[List of Patents for class 340 subclass 13.38]    13.38Divided resistor:
 This subclass is indented under subclass 13.37.  Subject matter including a connection between plural resistance elements connected across a potential source.
(1) Note. The plural resistance elements may be portions of a variable resistor.
  
[List of Patents for class 340 subclass 14.1]    14.1Decoder matrix:
 This subclass is indented under subclass 1.1.  Subject matter having a two or more dimensional array of electrical elements in a receiver for distinguishing different control signals, and not elsewhere classifiable.
(1) Note. Switching systems including nonlinear saturable reactor (e.g., magnetic core) switching are classified elsewhere.
(2) Note. Information storage systems including nonlinear saturable reactors (e.g., magnetic cores) are classified elsewhere.

SEE OR SEARCH THIS CLASS, SUBCLASS:

2.2through 2.31, for a channel selecting matrix.

SEE OR SEARCH CLASS:

307Electrical Transmission or Interconnection Systems,   subclasses 401 through 424for switching systems including nonlinear saturable reactor (e.g., magnetic core) switching.
326Electronic Digital Logic Circuitry,   subclasses 105 through 108for a logic decoder which is a function of AND, OR, NAND, NOR, or NOT.
341Coded Data Generation or Conversion,   appropriate subclasses for the production or converting of a code.
345Computer Graphics Processing and Selective Visual Display Systems,   subclass 55 for a selectively actuated display matrix.
365Static Information Storage and Retrieval,   subclasses 129 through 188for information storage systems including nonlinear saturable reactors (e.g., magnetic cores).
706Data Processing: Artificial Intelligence,   subclasses 15 through 44for neural networks.
710Electrical Computers and Digital Data Processing Systems: Input/Output,   subclasses 100 through 132for system intraconnecting, and particularly subclasses 131-132 for path selection and switching (e.g., crossbar switching) in a digital data processing system.
711Electrical Computers and Digital Processing Systems: Memory,   subclasses 200 through 221for generalized address forming.
  
[List of Patents for class 340 subclass 14.2]    14.2Plural stage:
 This subclass is indented under subclass 14.1.  Subject matter wherein each element of the matrix is itself a matrix.

SEE OR SEARCH THIS CLASS, SUBCLASS:

2.21through 2.24, for plural stage channel selecting matrix, and subclass 2.6 for plural stage path selection in general.
  
[List of Patents for class 340 subclass 14.3]    14.3Programmable:
 This subclass is indented under subclass 14.1.  Subject matter wherein the array or an element thereof has a settable signal response in accordance with a programmed or other setting by an operator.

SEE OR SEARCH CLASS:

257Active Solid-State Devices (e.g., Transistors,   Solid-State Diodes) subclass 209 for programmable path active solid-state gate array, and subclasses 529-530 for integrated circuit structure with programmable passive component.
326Electronic Digital Logic Circuitry,   subclasses 37 through 50for programmable logic circuitry.
341Coded Data Generation or Conversion,   subclass 78 for a programmable digital to digital converter.
365Static Information Storage and Retrieval,   appropriate subclass for electromagnetic storage systems, and subclasses 185.01 through 185.33for floating gate memory storage (e.g., flash memory).
716Computer-Aided Design and Analysis of Circuits and Semiconductor Masks,   subclass 116 for mapping circuit design to programmable logic devices (PLDs).
  
[List of Patents for class 340 subclass 14.31]    14.31Having fusible element:
 This subclass is indented under subclass 14.3.  Subject matter wherein a matrix element or link thereto has current fusible conductor which modifies the characteristics of the array when fused.
  
[List of Patents for class 340 subclass 14.4]    14.4Logic crosspoint:
 This subclass is indented under subclass 14.1.  Subject matter wherein the matrix processes a control signal to form a nonarithmetic digital output.

SEE OR SEARCH CLASS:

326Electronic Digital Logic Circuitry,   appropriate subclasses for digital logic, per se.
  
[List of Patents for class 340 subclass 14.5]    14.5Bistable crosspoint:
 This subclass is indented under subclass 14.1.  Subject matter wherein an element has, or is part of, a circuit having two latched operating states, one of which is set by a control signal.

SEE OR SEARCH CLASS:

327Miscellaneous Active Electrical Nonlinear Devices, Circuits, and Systems,   subclasses 185 through 230for a particular stable state (e.g., bistable) circuit, per se.
  
[List of Patents for class 340 subclass 14.6]    14.6Semiconductor crosspoint:
 This subclass is indented under subclass 14.1.  Subject matter wherein a matrix element has an electrical conductivity intermediate that of conductors and that of insulators.

SEE OR SEARCH THIS CLASS, SUBCLASS:

2.28through 2.31, for a crosspoint switch detail in a channel selecting matrix, particularly 2.29 for semiconductor switch detail in a channel selecting matrix.
  
[List of Patents for class 340 subclass 14.61]    14.61Integrated circuit:
 This subclass is indented under subclass 14.6.  Subject matter wherein a matrix element includes plural circuit elements inseparably mounted upon a continuous substrate.

SEE OR SEARCH CLASS:

257Active Solid-State Devices (e.g., Transistors, Solid-State Diodes),   appropriate subclasses for particular solid-state integrated device structure.
327Miscellaneous Active Electrical Nonlinear Devices, Circuits, and Systems,   subclass 564 for miscellaneous integrated circuits.
  
[List of Patents for class 340 subclass 14.62]    14.62Transistor:
 This subclass is indented under subclass 14.6.  Subject matter wherein the semiconductor element has three or more electrodes and a potential barrier in or on the semiconductor material.

SEE OR SEARCH CLASS:

257Active Solid-State Devices (e.g., Transistors, Solid-State Diodes),   appropriate subclasses for particular solid-state transistor structure.
327Miscellaneous Active Electrical Nonlinear Devices, Circuits, and Systems,   subclasses 574 through 582for miscellaneous circuits using three or more electrode solid-state device.
  
[List of Patents for class 340 subclass 14.63]    14.63Field effect transistor:
 This subclass is indented under subclass 14.62.  Subject matter wherein the resistance between two terminals of the transistor is controlled by the field produced by the voltage applied to a third terminal.

SEE OR SEARCH CLASS:

257Active Solid-State Devices (e.g., Transistors, Solid-State Diodes),   subclasses 213 through 413for a field effect device, per se.
327Miscellaneous Active Electrical Nonlinear Devices, Circuits, and Systems,   subclass 581 for miscellaneous circuits using a field effect transistor.
  
[List of Patents for class 340 subclass 14.64]    14.64Four or more electrode type:
 This subclass is indented under subclass 14.62.  Subject matter wherein the transistor has more than three electrodes contacting the semiconductor material.
  
[List of Patents for class 340 subclass 14.65]    14.65Plural transistors in element:
 This subclass is indented under subclass 14.62.  Subject matter wherein a semiconductor matrix element includes a circuit having two or more transistors.
(1) Note. At least one matrix element must include plural transistors. A matrix comprising a plurality of single transistor elements is classified elsewhere.

SEE OR SEARCH THIS CLASS, SUBCLASS:

14.62,for a matrix comprising a plurality of single transistor elements.
  
[List of Patents for class 340 subclass 14.66]    14.66Semiconductor diode:
 This subclass is indented under subclass 14.6.  Subject matter wherein the semiconductor element has a potential barrier and two electrodes.
(1) Note. The term "potential barrier" is intended to include electrode point contacts as well as p-n junctions.

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14.1,for similar subject matter having a discharge tube device.

SEE OR SEARCH CLASS:

257Active Solid-State Devices (e.g., Transistors, Solid-State Diodes),   appropriate subclasses for particular solid-state diode structure.
327Miscellaneous Active Electrical Nonlinear Devices, Circuits, and Systems,   subclasses 583 through 587for miscellaneous circuits using a two electrode solid state device.
  
[List of Patents for class 340 subclass 14.67]    14.67Charge storage:
 This subclass is indented under subclass 14.66.  Subject matter wherein a diode is, or is connected to, an element which stores electrostatic energy.
  
[List of Patents for class 340 subclass 14.68]    14.68Plural diodes at crosspoint:
 This subclass is indented under subclass 14.66.  Subject matter wherein a semiconductor matrix element includes more than one diode.
(1) Note. The plural diodes are often connected together so as to form an element having a characteristic which is a composite of the several diodes.
  
[List of Patents for class 340 subclass 14.69]    14.69Switching element:
 This subclass is indented under subclass 14.6.  Subject matter wherein the semiconductor changes between two distinct conductive states in accordance with the value of an applied signal.
(1) Note. The signal causing switching may be applied across a normally conductive path, or may be applied at an auxiliary electrode.
(2) Note. The two states are often conducting and nonconducting.

SEE OR SEARCH CLASS:

327Miscellaneous Active Electrical Nonlinear Devices, Circuits, and Systems,   subclasses 365 through 508for miscellaneous gating circuits which switch input to output.
  
[List of Patents for class 340 subclass 15.1]    15.1Having electron beam device:
 This subclass is indented under subclass 1.1.  Subject matter including an element within which a narrow stream of electrons is moved in the same direction by an electric or magnetic field.
(1) Note. The electron beam is generally used as an electric current connection.
  
[List of Patents for class 340 subclass 16.1]    16.1System having rectifier:
 This subclass is indented under subclass 1.1.  Subject matter including an asymmetrically conducting element.
  
[List of Patents for class 340 subclass 146.2]    146.2
 This subclass is indented under the class definition.  Subject matter having means for comparing signals or information in digital form to determine which is the greater, the lesser, or whether they are numerically equal.
(1) Note. The digital signals are not limited to any particular radix, and may be, for example, binary, decimal, etc.

SEE OR SEARCH THIS CLASS, SUBCLASS:

5.1through 5.92, for intelligence comparison for controlling in a selective communication system.

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250Radiant Energy,   subclasses 568+ for a photocell and a coded record wherein the coded information consists of discrete identical indicia and is represented by the relative positional locations of the indicia on the record.
  
[List of Patents for class 340 subclass 286.01]    286.01SYSTEMS:
 This subclass is indented under the class definition.  Subject matter relating to a system including transmitter and receiver for signaling and/or indicating.
(1) Note. This is the miscellaneous subclass for systems of signaling and/or indicating and their subcombinations, not elsewhere provided for.
(2) Note. The terms signaling and indicating each denote production of a humanly perceptible signal.
(3) Note. Consult the search notes to the class definitions for some of the numerous other classes which contain signaling or indicating systems.

SEE OR SEARCH THIS CLASS, SUBCLASS:

1.1,through 16.1, for selective signaling.
500+,for condition responsible alarm signaling.
815.4+,for a visual indicator for signaling.

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345Computer Graphics Processing and Selective Visual Display Systems,   for signaling with a selective display.
  
[List of Patents for class 340 subclass 286.02]    286.02Network signaling:
 This subclass is indented under subclass 286.01.  Subject matter consisting of an organization of stations with a capability for intercommunication although not necessarily on the same channel.

SEE OR SEARCH THIS CLASS, SUBCLASS:

9.1,through 9.17, for this subject matter further including station addressing.

SEE OR SEARCH CLASS:

370Multiplex Communications,   appropriate subclasses for network of stations including multiplexed communications therebetween.
379Telephonic Communications,   appropriate subclasses for signaling specific to a telephone systems.
  
[List of Patents for class 340 subclass 286.03]    286.03Speaking tube including circuit:
 This subclass is indented under subclass 286.02.  Subject matter in which a tube-shaped device mechanically transmits and/or amplifies sound in combination with a diverse electrical circuit.

SEE OR SEARCH CLASS:

181Acoustics,   subclass .5 for a speaking tube, per se; e.g., without diverse circuitry.
  
[List of Patents for class 340 subclass 286.04]    286.04Manual alarm telegraph; e.g., other than signal box type:
 This subclass is indented under subclass 286.01.  Subject matter wherein the system employs interruptions and/or polarity changes of direct current for the transmission of alarm signals that have been keyed.
(1) Note. This is the residual subclass for manual alarm telegraphs systems not elsewhere classified.
(2) Note. Manual alarm telegraphs are also called alarm telegraph systems.
(3) Note. The term "Telegraph system" should be distinguished from the subject matter of Class 178, Telegraphy, which subject matter permits signaling of a message of arbitrary content.

SEE OR SEARCH THIS CLASS, SUBCLASS:

287+,for this subject matter when the transmitter is of the signal box type.
500+,for condition responsive alarm devices.

SEE OR SEARCH CLASS:

178Telegraphy,   subclasses 2+ for Telegraph systems including information signal of arbitrary contents.
  
[List of Patents for class 340 subclass 286.05]    286.05Fire:
 This subclass is indented under subclass 286.04.  Subject matter in which the alarm is actuated to indicate the occurrence of a fire.

SEE OR SEARCH THIS CLASS, SUBCLASS:

287+,for a signal box type fire alarm.
577+,for a flame actuated fire alarm.
628+,for a smoke actuated fire alarm.
  
[List of Patents for class 340 subclass 286.06]    286.06Call station:
 This subclass is indented under subclass 286.01.  Subject matter in which a transceiver connects rooms or other places from which a signal or call is sent and/or received to the central or main location.
  
[List of Patents for class 340 subclass 286.07]    286.07Hospital:
 This subclass is indented under subclass 286.06.  Subject matter located at an institution where the sick or injured are given medical care.
  
[List of Patents for class 340 subclass 286.08]    286.08Hotel:
 This subclass is indented under subclass 286.06.  Subject matter located at an establishment that provides lodging.
  
[List of Patents for class 340 subclass 286.09]    286.09Restaurant:
 This subclass is indented under subclass 286.06.  Subject matter located at a public eating place.
  
[List of Patents for class 340 subclass 286.11]    286.11Annunciator:
 This subclass is indented under subclass 286.01.  Subject matter in which an electrically controlled signal board or indicator indicates the condition that exists or has existed in an associated circuit.

SEE OR SEARCH THIS CLASS, SUBCLASS:

815.47,for switchboard or panel type visual indicator for signaling and subclasses 815.01+ for group drop annunciators.

SEE OR SEARCH CLASS:

116Signals and Indicators,   appropriate subclasses for nonelectric signaling.
  
[List of Patents for class 340 subclass 286.12]    286.12Drop annunciator:
 This subclass is indented under subclass 286.11.  Subject matter in which the annunciator consists of a number of pilot lights or drops, each one indicating an associated circuit condition.

SEE OR SEARCH THIS CLASS, SUBCLASS:

815.47+,for switchboard or panel type visual indicator for signaling.
815.79+,for pointer annunciator.
815.81+,for group drop annunciators.
815.85,for self restoring type annunciator.
815.9+,for electromagnet releases latch.
  
[List of Patents for class 340 subclass 286.13]    286.13Mimic:
 This subclass is indented under subclass 286.01.  Subject matter in which the signaling or indicating copies or imitates by a spatial distribution that which is being indicated upon a single indicating surface.
(1) Note. This surface is usually a display.

SEE OR SEARCH THIS CLASS, SUBCLASS:

525,for this subject matter in a condition responsive signaling system.

SEE OR SEARCH CLASS:

345Computer Graphics Processing and Selective Visual Display Systems,   subclasses 168+ for this subject matter in a selective display system.
  
[List of Patents for class 340 subclass 286.14]    286.14Mapping:
 This subclass is indented under subclass 286.13.  Subject matter in which the signaling or indicating forms representation of the whole or a part of an area.
  
[List of Patents for class 340 subclass 287]    287Signal box type (e.g., to call messenger, plural fire alarm boxes):
 This subclass is indented under subclass 286.  Subject matter in which the transmitter is of the signal box type.
(1) Note. The signal box may be of the type which is used in fire alarms, police, district telegraph, messenger box or the like systems. The transmitter usually is a code transmitter.

SEE OR SEARCH THIS CLASS, SUBCLASS:

534+,for code transmitter systems which are automatically responsive to a condition.

SEE OR SEARCH CLASS:

341Coded Data Generation or Conversion,   subclasses 20+ and 173+ for a pulse code transmitter.
  
[List of Patents for class 340 subclass 288]    288Combined (e.g., alarm circuit over power line):
 This subclass is indented under subclass 287.  Subject matter combined with some other type of subject matter.
(1) Note. The signaling system, for example, may be combined with an electric light system whose conductors are used as the transmission medium for the signaling system.

SEE OR SEARCH CLASS:

178Telegraphy,   subclass 49 for telegraph systems combined with other types of electric systems.
  
[List of Patents for class 340 subclass 289]    289With fire extinguisher (e.g., CO2):
 This subclass is indented under subclass 288.  Subject matter combined with a fire extinguisher.

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169Fire Extinguishers,   appropriate subclasses, particularly subclass 23 for combinations of extinguishers as sprinkling systems with mere electric alarms other than code signals of the signal box transmission type.
  
[List of Patents for class 340 subclass 290]    290Engine house apparatus controlling (e.g., releases horses, starts motor):
 This subclass is indented under subclass 288.  Subject matter in which the signaling system is combined with means to control apparatus at the fire station.
(1) Note. The system may, for example, automatically open a door at the engine house when the fire alarm rings.
  
[List of Patents for class 340 subclass 291]    291Repeaters (e.g., from central to plural fire houses or to siren):
 This subclass is indented under subclass 287.  Subject matter having means for repeating signals one or more times or for repeating signals from one line or station to another line or station.
(1) Note. The signal may be repeated, for example, from the call box circuit into several circuits extending to separate fire houses.

SEE OR SEARCH CLASS:

178Telegraphy,   subclasses 70+ for repeaters utilized in telegraphy.
  
[List of Patents for class 340 subclass 292]    292Circuit maintenance (e.g., fault alarm, faulty circuit substitution):
 This subclass is indented under subclass 287.  Subject matter provided with means for maintaining the circuit in operable condition so as to permit sending signals at all times in spite of one or more breaks in the wires and signal box systems provided with means for giving an alarm when an abnormal condition in a circuit, which would prevent normal use, develops.

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178Telegraphy,   subclass 69 for line clearance and circuit maintenance systems utilized in telegraphy.
  
[List of Patents for class 340 subclass 293]    293Variable signal (e.g., police and fire, first and third alarm):
 This subclass is indented under subclass 287.  Subject matter provided with means at the signal box for transmitting one or more of a variety of signals under the control of the operator.

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341Coded Data Generation or Conversion,   subclasses 20+ and 173+ for a pulse code transmitter.
  
[List of Patents for class 340 subclass 294]    294Dial selector for variable signal:
 This subclass is indented under subclass 293.  Subject matter provided with a dial selector for selecting the variable signal desired.
  
[List of Patents for class 340 subclass 295]    295Noninterfering (prevents break-in by another box during transmission):
 This subclass is indented under subclass 287.  Subject matter provided with means for preventing the transmission of signals from any other box or other signals from the same box while any signal is being transmitted therefrom and until such signal is completed.
  
[List of Patents for class 340 subclass 296]    296Key obstruction type:
 This subclass is indented under subclass 295.  Subject matter provided with means to obstruct the entrance of the key which is used to operate the signal box, said means operating to prevent insertion of the key only during the transmission of a signal sequence.
  
[List of Patents for class 340 subclass 297]    297With signal at box (e.g., preliminary signal to combat false alarms):
 This subclass is indented under subclass 287.  Subject matter provided with means to exhibit indications at the signal box from which the signals are transmitted, so that said box also acts as a receiver.
(1) Note. The signal box, when operated, for example, may produce a preliminary signal of the audible type at the box to discourage would be pranksters from turning in a false alarm.
  
[List of Patents for class 340 subclass 298]    298Answer back signal acknowledges transmitted signal:
 This subclass is indented under subclass 297.  Subject matter having means to send an answer-back signal to notify the operator that the transmitted signal has been received.
  
[List of Patents for class 340 subclass 299]    299Simultaneous (e.g., actuated by transmitted signal):
 This subclass is indented under subclass 297.  Subject matter in which the signal at the box is operated simultaneously by the transmitted signal.
  
[List of Patents for class 340 subclass 300]    300Lamp at box (e.g., to call patrolman):
 This subclass is indented under subclass 297.  Subject matter in which the signal at the box is a lamp.
(1) Note. The lamp may, for example, be used to notify a policeman on his beat to call in.
  
[List of Patents for class 340 subclass 301]    301Portable box actuating key (e.g., key must be released by signal from central):
 This subclass is indented under subclass 287.  Subject matter in which the signal box in actuated by a movable key.
(1) Note. The key may, for example, be attached to the box by means of a chain, or the key may be in the custody of the person who turns in the alarm, who must surrender the key to box mechanism before he can turn the alarm in, so that his identity may be made known.
  
[List of Patents for class 340 subclass 302]    302Frangible guard or protector for key:
 This subclass is indented under subclass 301.  Subject matter in which the key is normally housed by a frangible closure, which must be broken in order to obtain the key for operation of the box.
  
[List of Patents for class 340 subclass 303]    303Frangible element must be broken to send signal:
 This subclass is indented under subclass 287.  Subject matter provided with a frangible closure which must be broken in order to send a signal.

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302,for this subject matter where the frangible closure encloses a movable key, which key is used to transmit the signal.
  
[List of Patents for class 340 subclass 304]    304False alarm combating (e.g., detention devices):
 This subclass is indented under subclass 287.  Subject matter provided with means for combating false alarms.
(1) Note. The signal box may, for example, be provided with means for detaining, as by hand-cuffing means, the person who sends in an alarm.

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301,for signal box systems where the person turning in the alarm must surrender an individual key to the signal box mechanism before he can send the alarm.
  
[List of Patents for class 340 subclass 305]    305Local circuit to actuate box:
 This subclass is indented under subclass 287.  Subject matter in which the signal box is actuated by a local circuit separate from the main circuit.
  
[List of Patents for class 340 subclass 306]    306Watchman's local circuit:
 This subclass is indented under subclass 305.  Subject matter in which the signal box is provided with a local circuit for use by watchmen.
  
[List of Patents for class 340 subclass 307]    307Transmitters:
 This subclass is indented under subclass 287.  Subject matter consisting of a transmitter utilized in signal box systems.

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341Coded Data Generation or Conversion,   subclasses 20+ and 173+ for a pulse code transmitter.
  
[List of Patents for class 340 subclass 308]    308Controlled by door of signal box:
 This subclass is indented under subclass 307.  Subject matter in which the signal is sent automatically when the door of the signal box is opened.
  
[List of Patents for class 340 subclass 309]    309With make and break wheel:
 This subclass is indented under subclass 307.  Subject matter having a rotary make and break wheel.

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341Coded Data Generation or Conversion,   subclasses 16 and 17 for a pulse code transmitter having a rotary make and break wheel.
  
[List of Patents for class 340 subclass 309.16]    309.16Timer controlled:
 This subclass is indented under subclass 286.01.  Subject matter in which the system includes means whereby the communication is brought about after a predetermined time lapse or is continued for a predetermined time following initiation.

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219Electric Heating,   subclass 719 for a timer control system for a microwave heating device.
368Horology: Time Measuring Systems or Devices,   appropriate subclassesfor detailed time measuring systems (including chronological) which may include an alarm.
  
[List of Patents for class 340 subclass 309.2]    309.2With nonelectrical indicator or exhibitor:
 This subclass is indented under subclass 309.16.  Subject matter combined with means other than partially or wholly electrical means for conveying information or intelligence.
  
[List of Patents for class 340 subclass 309.3]    309.3With diversely controlled indicator:
 This subclass is indented under subclass 309.16.  Subject matter including an additional means, not under the control of the timer, for conveying information or intelligence.
  
[List of Patents for class 340 subclass 309.4]    309.4Selectively or sequentially actuated indicators:
 This subclass is indented under subclass 309.16.  Subject matter including a plurality of indicators selectively or sequentially controlled by the timer.
  
[List of Patents for class 340 subclass 309.5]    309.5With independent manual controller:
 This subclass is indented under subclass 309.4.  Subject matter including a manually actuated means which has no utility in the operation involving the timer but may be utilized for controlling one or more of the indicators independently of the timer.
  
[List of Patents for class 340 subclass 309.6]    309.6Circuit maker-breaker in series:
 This subclass is indented under subclass 309.16.  Subject matter in which the communication system includes two circuit maker-breakers in series, both of which must be closed in order for the information or intelligence to be transmitted, and both of the circuit maker-breakers being under the control of the timer.
  
[List of Patents for class 340 subclass 309.7]    309.7Reminder device with built-in timer:
 This subclass is indented under subclass 309.16.  Subject matter wherein a prompting device has an incorporated timing device.
  
[List of Patents for class 340 subclass 309.8]    309.8Separate diverse device activated by timer:
 This subclass is indented under subclass 309.16.  Subject matter wherein operation of a device distinct from a timer is initiated by a condition of the timer.
  
[List of Patents for class 340 subclass 309.9]    309.9Separate diverse device deactivated by timer:
 This subclass is indented under subclass 309.16.  Subject matter wherein the operation of a device distinct from a timer is terminated by condition of the timer.
  
[List of Patents for class 340 subclass 311.2]    311.2Nonselective paging (e.g., public address system):
 This subclass is indented under subclass 286.01.  Subject matter wherein there is a humanly perceptible indication which is used to summon an individual and the indication is nonselective.
(1) Note. The subject matter of this subclass is limited to nonselective paging. Selective paging is classified elsewhere.

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7.2through 7.63, for selective paging systems.
  
[List of Patents for class 340 subclass 313]    313Answer back:
 This subclass is indented under subclass 286.02.  Subject matter having means to send an interrogation from one station to another and having means to send the answer to said interrogation back from said second station to said first station.

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10.1through 10.6, for selective systems for automatically and selectively answering interrogations.
  
[List of Patents for class 340 subclass 314]    314Noncorrespondence alarm (e.g., if acknowledgement is incorrect):
 This subclass is indented under subclass 313.  Subject matter having means to sound an alarm if the answer to the interrogation is improper.
  
[List of Patents for class 340 subclass 315]    315Selsyn type:
 This subclass is indented under subclass 286.01.  Subject matter having selsyn-type transmitters and receivers.

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870.34,for this subject matter in telemetering systems.

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318Electricity: Motive Power Systems,   subclasses 690+ for self-synchronous electric motor systems.
  
[List of Patents for class 340 subclass 316]    316Rebalancing at receiver:
 This subclass is indented under subclass 286.02.  Subject matter in which the receiver is provided with means which are unbalanced by the transmitter signal and is provided with means for rebalancing said means.

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318Electricity: Motive Power Systems,   subclasses 638+ for electric motor systems controlled by a self-balancing network.
  
[List of Patents for class 340 subclass 317]    317Automatic rebalancing:
 This subclass is indented under subclass 316.  Subject matter in which the unbalanced means at the receiver is automatically rebalanced.

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870.43,for similar subject matter utilized in telemetering systems.
  
[List of Patents for class 340 subclass 318]    318Synchronous distributor at transmitter and receiver:
 This subclass is indented under subclass 286.  Subject matter having synchronous distributers at both the transmitter and receiver.

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870.13+,for similar subject matter utilized in telemetering systems.

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370Multiplex Communications,   subclasses 304+ for multiplexing systems which include a synchronous distributor at both the transmitter and receiver.
  
[List of Patents for class 340 subclass 319]    319Plural electromagnets or plural motors receiver:
 This subclass is indented under subclass 286.01.  Subject matter in which the receiver has plural electromagnets or plural motors.

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870.05,for similar subject matter utilized in telemetering systems.
  
[List of Patents for class 340 subclass 320]    320Via fluid conduit (e.g., fire hose):
 This subclass is indented under subclass 286.01.  Subject matter in which the electric signal is transmitted along a fluid conduit.
(1) Note. The fluid conduit may, for example, be a fire hose, so that the firemen may be able to communicate back from the nozzle to the engine pumper.

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174Electricity: Conductors and Insulators,   subclasses 8+ and 47 for fluid conduits combined with electrical conductors.
  
[List of Patents for class 340 subclass 321]    321Portable self-contained (e.g., movie usher's signalling flashlight):
 This subclass is indented under subclass 286.01.  Subject matter which is portable and self-contained.
(1) Note. This subclass includes, for example, movie ushers" flashlights which have means for signaling.

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362Illumination,   subclasses 157+ for battery flashlights of general utility.
  
[List of Patents for class 340 subclass 322]    322Self-cancelling after fixed time:
 This subclass is indented under subclass 286.01.  Subject matter in which the system has means to cancel any indications after a fixed time.
  
[List of Patents for class 340 subclass 323]    323Game reporting
 This subclass is indented under subclass 286.01.  Subject matter for reporting the status of a game.

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116Signals and Indicators,   subclasses 222+ for mechanical game reporting devices.
273Amusement Devices: Games,   appropriate subclasses for games in combination with game reporting devices.
473Games Using Tangible Projectile,   and its incorporated class (273, Amusement Devices, Games) for a game device or apparatus with a game reporting device.
  
[List of Patents for class 340 subclass 326]    326Plural (e.g., concurrent auxiliary) single indications (e.g., light flashes when bell rings):
 This subclass is indented under subclass 286.01.  Subject matter in which a single variation indication is given at plural points or in plural manners.
(1) Note. The indication may, for example, be given by an electric light signal and also by an electric bell signal, so that the bell rings when the light flashes.
  
[List of Patents for class 340 subclass 327]    327With sounder signal cut-off:
 This subclass is indented under subclass 326.  Subject matter provided with means to cut off a sound signal.
(1) Note. The sound signal, for example, may be cut off while the light signal continues to flash, or one sound signal may be cut off while the second one continues to sound.
  
[List of Patents for class 340 subclass 328]    328Audible signals (e.g., bell rings softly first and then loudly):
 This subclass is indented under subclass 286.01.  Subject matter having an audible signal.

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384+,for audible signals, per se.
  
[List of Patents for class 340 subclass 329]    329Intermittent:
 This subclass is indented under subclass 328.  Subject matter in which the audible signal operates intermittently.
  
[List of Patents for class 340 subclass 330]    330In and out indicators (e.g., doorbell button flashes "out" sign)
 This subclass is indented under subclass 286.01.  Subject matter for signaling whether a person is "in" or "out".
(1) Note. A door bell button may, for example, cause an "out" sign to flash instead of causing the bell to ring.
  
[List of Patents for class 340 subclass 331]    331Periodic or flashing:
 This subclass is indented under subclass 286.01.  Subject matter having a periodic or flashing signal.

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329,for this subject matter where the signal indicator is audible.
  
[List of Patents for class 340 subclass 332]    332Signal light systems:
 This subclass is indented under subclass 286.01.  Subject matter having signal lights.
  
[List of Patents for class 340 subclass 333]    333With specific power supply (e.g., power substitution):
 This subclass is indented under subclass 286.01.  Subject matter having significantly recited or significant power supply systems.
(1) Note. The system, for example, may be provided with means to substitute an auxiliary source of power if the regular source fails.

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307Electrical Transmission or Interconnection Systems,   subclasses 64+ for emergency power systems of general application.
  
[List of Patents for class 340 subclass 384.1]    384.1AUDIBLE INDICATION:
 This subclass is indented under the class definition.  Subject matter comprising signalling means for producing an acoustic wave as a signalling indication.

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116Signals and Indicators,   appropriate subclasses for nonelectrical audible indicators.
178Telegraphy,   subclass 99.1 for private sounders (e.g., acoustically shielded).
219Electric Heating,   subclass 248 for a heating device combined with a sole plate-type pressure application means (e.g., a flatiron, etc.) including a condition-responsive indicator, subclass 269 for an igniter-type resistive element indicating means, or subclass 720 where a control system for a microwave heating device has a display or alarm.
221Article Dispensing,   subclass 3 for article dispensing with audible recorder, register, indicator, signal, or exhibitor.
222Dispensing,   subclass 39 for dispensing with audible recorder, register, indicator, signal, or exhibitor.
367Communication, Electrical: Acoustic Wave Systems and Devices,   subclasses 140+ for acoustic signalling devices for use in electro-acoustic communication.
368Horology: Time Measuring Systems or Devices,   subclasses 243+ for signalling means.
704Data Processing: Speech Signal Processing, Linguistics, Language Translation, and Audio Compression/Decompression,   subclasses 231+ for speech analysis (e.g., phoneme recognition) and subclasses 258+ for speech synthesis.
  
[List of Patents for class 340 subclass 384.2]    384.2Ultrasonic pest control:
 This subclass is indented under subclass 384.1.  Subject matter wherein the audible signalling means includes a source for generating electrical signals within an ultrasonic frequency range and a transducer means for converting the electrical signals into an acoustic wave to repel unwanted animals.

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43Fishing, Trapping, and Vermin Destroying,   appropriate subclasses for similar subject matter wherein the animal is destroyed or at least injured.
116Signals and Indicators,   subclass 22 for nonelectrical animal frightening device.
367Communications, Electrical: Acoustic Wave Systems and Devices,   subclass 139 for animal control.
  
[List of Patents for class 340 subclass 384.3]    384.3Simulation:
 This subclass is indented under subclass 384.1.  Subject matter wherein the produced audible sounds are imitative sounds.
(1) Note. This subclass, includes, for example, audible signalling means for producing an imitative representation of sounds emitted by animals, engines, ship propellers, vehicles, children"s toys, etc.

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446Amusement Devices: Toys,   subclasses 397+ for sounding amusement devices.
  
[List of Patents for class 340 subclass 384.4]    384.4Electronic siren (e.g., wail tone or yelp tone warning device):
 This subclass is indented under subclass 384.1.  Subject matter wherein the audible signalling means includes a source for generating audio frequency electrical signals having a rising and falling pitch and a transducer for converting the signals into the produced audible sounds.

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404.1,for pneumatic siren sound producer.

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116Signals and Indicators,   subclass 147 for nonelectrical siren.
  
[List of Patents for class 340 subclass 384.5]    384.5With computer element:
 This subclass is indented under subclass 384.1.  Subject matter wherein the audible signalling means comprises a keyboard, memory means, or computer means connected to a transducer means for inputting, storing, or processing information representing or relating to the produced sounds outputted by the transducer means.

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84Music,   subclasses 602+ for electrical musical tone generator instrument with digital memory circuit.
  
[List of Patents for class 340 subclass 384.6]    384.6Piezoelectric:
 This subclass is indented under subclass 384.1.  Subject matter wherein the audible signalling means is provided with a vibrator device for converting energized electrical signals into audible sounds in such a manner that the operation of the device depends on the interaction between electric charge of the energized electrical signals and the deformation or mechanical stress property of a crystal or ceramic element incorporated into the device.

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84Music,   subclass 730 for electrical musical tone generator instrument with piezoelectric transducer.
367Communications, Electrical: Acoustic Wave Systems and Devices,   subclass 180 for piezoelectric receivers and subclass 155 for underwater type piezoelectric transducer array.
381Electrical Audio Signal Processing Systems and Devices,   subclass 190 for electrostrictive, magnetostrictive, or piezoelectric electro-acoustic audio transducer.
  
[List of Patents for class 340 subclass 384.7]    384.7Electronic:
 Subject matter under 384.1 having circuitry comprising at least a signal generator for generating an audio frequency electrical signal and a transducer means for converting the signal into audible sounds.
(1) Note. The circuitry may include other devices or components such as an amplifier, filter, switching means, feedback for affecting the generation of the electrical signals or the outputted sounds.
  
[List of Patents for class 340 subclass 384.71]    384.71Timing:
 This subclass is indented under subclass 384.7.  Subject matter comprising a clock or timing means for producing the audible sounds at a repetitive rate or for controlling the start or the duration or the effect of the produced sounds.
  
[List of Patents for class 340 subclass 384.72]    384.72Plural generators:
 This subclass is indented under subclass 384.7.  Subject matter comprising a plurality of oscillators for generating audio frequency signals at different operating frequencies or means for producing multi-tone audible sounds.
  
[List of Patents for class 340 subclass 384.73]    384.73With sound transducer details:
 This subclass is indented under subclass 384.7.  Subject matter including at least a structural element of the sound transducer.
(1) Note. The structural element includes, for example, coil, core, diaphragm, etc. or supports therefor.

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381Electrical Audio Signal Processing Systems and Devices,   subclasses 150+ for nonindicating Electro Acoustic Audio Transducer.
  
[List of Patents for class 340 subclass 385.1]    385.1Explosive:
 This subclass is indented under subclass 384.1.  Subject matter having means to produce a sharp, loud sound by a violent and sudden release of confined energy.

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43Fishing, Trapping, and Vermin Destroying,   subclass 84 for explosive traps.
102Ammunition and Explosives,   appropriate subclasses for explosive devices in general.
116Signals and Indicators,   subclass 105 for nonelectrical ignition control explosive alarm.
  
[List of Patents for class 340 subclass 387.1]    387.1Weatherproofing:
 This subclass is indented under subclass 384.1.  Subject matter provided with means for inclosing the audible signalling device to protect it from moisture, insects, or other unwanted substances.
(1) Note. Watertight housing, sealed casing, etc., are included in this subclass.

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219Electric Heating,   subclass 209 combined with a diverse-type electrical art device.
  
[List of Patents for class 340 subclass 388.1]    388.1Diaphragm (e.g., horn or buzzer):
 This subclass is indented under subclass 384.1.  Subject matter wherein the audible sounds are produced by the vibration of an actuated flexible membrane.

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116Signals and Indicators,   subclasses 142+ for nonelectrical diaphragm horns, and subclass 59 for vehicle-energy actuated diaphragm horns.
381Electrical Audio Signal Processing Systems and Devices,   subclasses 112+ and subclasses 355+ for speaker, per se.
  
[List of Patents for class 340 subclass 388.2]    388.2Alternating current:
 This subclass is indented under subclass 388.1.  Subject matter wherein the vibration of the diaphragm is caused by a current that changes the polarity with time in such a manner that the current reaches maximum in one direction, decreases to zero, reverses itself, and reaches minimum in the opposite direction.

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401.1,for alternating current used in percussion type sound producers.
  
[List of Patents for class 340 subclass 388.3]    388.3With auxiliary flexible membrane:
 This subclass is indented under subclass 388.1.  Subject matter wherein the sounds are produced by the vibration of at least two diaphragms or by the vibration of a diaphragm and a resonator disc or plate secured to the diaphragm.
(1) Note. The two diaphragms are arranged in closely spaced parallel planes or in orthogonal planes.

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116Signals and Indicators,   subclass 145 for nonelectrical parallel diaphragms.
  
[List of Patents for class 340 subclass 388.4]    388.4With resonance chamber:
 This subclass is indented under subclass 388.1.  Subject matter provided with an air space or volume adapted to vibrate at a specific tuned frequency to amplify the produced sounds.
  
[List of Patents for class 340 subclass 388.5]    388.5Armature support:
 This subclass is indented under subclass 388.1.  Subject matter including means for pivotally mounting or holding a movable part operated by an electromagnet to transmit its movement to the diaphragm for producing sounds.
(1) Note. This subclass includes, the bridge the plate, the frame, and the arm by which the armature is secured or supported.

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397.1,for armature support of percussion type sound producers.
  
[List of Patents for class 340 subclass 388.6]    388.6Having spring:
 This subclass is indented under subclass 388.5.  Subject matter wherein the means for pivotally mounting or holding a movable part comprises a resilient member for supporting the armature or for restoring the armature to a normal position.
  
[List of Patents for class 340 subclass 388.7]    388.7Interrupter:
 This subclass is indented under subclass 388.1.  Subject matter including means for controlling the flow of current into an electromagnet thereby operating a movable part to vibrate the diaphragm.

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397.3,for interrupter of percussion-type sound producers.
  
[List of Patents for class 340 subclass 388.8]    388.8Having spring:
 This subclass is indented under subclass 388.7.  Subject matter wherein the interrupter comprises a resilient contact member or is supported by a resilient member.
  
[List of Patents for class 340 subclass 390.1]    390.1Rotary actuator:
 This subclass is indented under subclass 388.1.  Subject matter comprising a driving mechanism operated by an electric motor to move in a circular motion for mechanically agitating the diaphragm.

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116Signals and Indicators,   subclasses 143+ for nonelectrical rotary striker diaphragm horns.
  
[List of Patents for class 340 subclass 390.2]    390.2Having spring:
 This subclass is indented under subclass 390.1.  Subject matter wherein the driving mechanism comprises a resilient member for holding a driving shaft in a desired position by exerting a thrust force upon the shaft or for retracting the means for agitating the diaphragm.
  
[List of Patents for class 340 subclass 391.1]    391.1Housing or mounting:
 This subclass is indented under subclass 388.1.  Subject matter comprising means for supporting or enclosing the audible signalling device.
(1) Note. This subclass includes supports for the diaphragm.

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396.1,for housing or mounting of percussion type sound producers.
  
[List of Patents for class 340 subclass 392.1]    392.1Percussion-type sound producer (e.g., signal chimes or bells):
 This subclass is indented under subclass 384.1.  Subject matter having means to strike one element against another in order to produce the audible sounds.

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388.1,for this subject matter in which one of the elements is a diaphragm.

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84Music,   subclasses 402+ and 411+ for similar subject matter utilized in music.
116Signals and Indicators,   subclass 60 for vehicle-energy actuated bells, subclasses 148+ for nonelectrical bells, and subclass 25 for nonelectrical periodic bells.
  
[List of Patents for class 340 subclass 392.2]    392.2Rotary actuator:
 This subclass is indented under subclass 392.1.  Subject matter comprising a driving mechanism operated by an electric motor to move in a circular motion to actuate the striking means.
  
[List of Patents for class 340 subclass 392.3]    392.3Volume control:
 This subclass is indented under subclass 392.1.  Subject matter comprises means for regulating the loudness of the produced audible sounds.
  
[List of Patents for class 340 subclass 392.4]    392.4Tubular sound producer (e.g., signal chimes):
 This subclass is indented under subclass 392.1.  Subject matter wherein the striking means hits a cylindrical body for producing the audible sounds.
  
[List of Patents for class 340 subclass 392.5]    392.5Resonator (e.g., signal chimes):
 This subclass is indented under subclass 392.1.  Subject matter wherein the striking means hits a vibrating member associated with a tuned air chamber to emit a desired tone.
  
[List of Patents for class 340 subclass 393.1]    393.1Plural armatures:
 This subclass is indented under subclass 392.1.  Subject matter comprising at least two movable elements attracted by one or more electromagnets for actuating the striking means for generating the audible sounds.
  
[List of Patents for class 340 subclass 393.2]    393.2Battery operated:
 This subclass is indented under subclass 392.1.  Subject matter comprising a battery for energizing the striking means.

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362Illumination,   subclasses 157+ for flashlights having an unitary battery.
  
[List of Patents for class 340 subclass 393.3]    393.3Pushbutton:
 This subclass is indented under subclass 392.1.  Subject matter in which a manually actuated device must be depressed to operate the striking means for generating the audible sounds.
  
[List of Patents for class 340 subclass 393.4]    393.4Including timer:
 This subclass is indented under subclass 392.1.  Subject matter including a timing mechanism for controlling the timing of the strokes produced by the striking means.
  
[List of Patents for class 340 subclass 395.1]    395.1Suspended (e.g., locomotive bell):
 This subclass is indented under subclass 392.1.  Subject matter including means for hanging the sound producer.
  
[List of Patents for class 340 subclass 396.1]    396.1Housing or mounting:
 This subclass is indented under subclass 392.1.  Subject matter comprising means for enclosing or supporting the sound producing device.

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391.1,for housing or mounting of diaphragm sound producers.
  
[List of Patents for class 340 subclass 397.1]    397.1Armature support:
 This subclass is indented under subclass 392.1.  Subject matter comprising means for pivotally holding or mounting a movable part which oscillates when the coils of the audible signalling means are energized by a current to reciprocate the striking means.
(1) Note. This subclass includes, for example, the bridge, the plate, the frame, the arm, or the yoke by which the armature is secured or supported.

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388.5,for armature support of diaphragm sound producers.
  
[List of Patents for class 340 subclass 397.2]    397.2Having spring:
 This subclass is indented under subclass 397.1.  Subject matter comprising a resilient member for carrying the armature, for restoring the armature to a normal position or for supplementing the effect of the current to move the armature.
  
[List of Patents for class 340 subclass 397.3]    397.3Interrupter:
 This subclass is indented under subclass 392.1.  Subject matter including means for controlling the flow of current into an electromagnet to cause one element to strike against the other repeatedly.

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388.8,for interrupter of diaphragm sound producers.
  
[List of Patents for class 340 subclass 397.4]    397.4Having spring:
 This subclass is indented under subclass 397.3.  Subject matter wherein means for controlling the flow of current includes a resilient contact member or is supported by a resilient member.
  
[List of Patents for class 340 subclass 397.5]    397.5Polarized:
 This subclass is indented under subclass 392.1.  Subject matter wherein the striking means is electromagnetically operated and comprises a permanent magnet operatively causing the reciprocating of the armature.
(1) Note. This subclass includes, for example, a permanent magnet for magnetizing the armature, thereby creating permanent magnetic flux in the air gaps between the ends of the armature and the cores; current sent through the coils, produces a flux which adds to or subtracts from the permanent magnetic flux in the air gaps causing the armature to attract or repulse from two poles of the coils thereby causing the movement of the armature to reciprocate the striking mechanism; successive reversal of current in the coil terminal changes the direction of magnetism in the air gaps and thereby causing the armature to move up and down.
  
[List of Patents for class 340 subclass 398.1]    398.1Nonelectrical driving means (e.g., spring or weight):
 This subclass is indented under subclass 392.1.  Subject matter wherein the striking means is driven by gravitational or stored mechanical energy.
  
[List of Patents for class 340 subclass 398.2]    398.2With electromagnetic control:
 This subclass is indented under subclass 398.1.  Subject matter having an armature operated by an electromagnet to restrict or release the striking means.
  
[List of Patents for class 340 subclass 398.3]    398.3Including circuit breaker:
 This subclass is indented under subclass 398.2.  Subject matter comprising an electric circuit having switch means for controlling the energization of the electromagnet.
  
[List of Patents for class 340 subclass 401.1]    401.1Alternating current:
 This subclass is indented under subclass 392.1.  Subject matter in which striking means is operated by a current that changes polarity with time in such a manner that the current reaches maximum in one direction, decreases to zero, reverses itself, and reaches minimum in the opposite direction.

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388.2,for alternating current used in diaphragm sound producers.
  
[List of Patents for class 340 subclass 404.1]    404.1Pneumatic-type sound producer (e.g., whistle or siren):
 This subclass is indented under subclass 384.1.  Subject matter wherein the signalling means is operated by the flowing of air or other gaseous stream to produce the audible sounds.

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815.72,for diverse indications having a pneumatic-type indication.

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251Valves and Valve Actuation,   subclasses 129.01+ for electrically actuated valve.
  
[List of Patents for class 340 subclass 404.2]    404.2Rotary actuator:
 This subclass is indented under subclass 404.1.  Subject matter comprising an electric motor for actuating a driving mechanism in a circular motion to produce the audible sounds.
  
[List of Patents for class 340 subclass 404.3]    404.3With valve:
 This subclass is indented under subclass 404.1.  Subject matter comprising means for regulating the flow of air or other gaseous stream thereby controlling the effect of the produced sounds.
  
[List of Patents for class 340 subclass 407.1]    407.1TACTUAL INDICATION:
 This subclass is indented under the class definition.  Subject matter comprising means for producing an indication signal perceptible by the sense of touch.
(1) Note. The sense of touch is of human or animal.

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116Signals and Indicators,   subclass 205 for nonelectrical indicators by touch.
345Computer Graphics Processing and Selective Visual Display Systems,   subclasses 173+ for touch panel used as input device of selective display systems.
901Robots,   subclass 32 for tactile sensor.
  
[List of Patents for class 340 subclass 407.2]    407.2With input means (e.g., keyboard):
 This subclass is indented under subclass 407.1.  Subject matter combined with a manually actuated device to enter control or information data.
(1) Note. The manually actuated device includes, for example, a keyboard which may not, however, be the means for producing the indication itself.

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341Coded Data Generation or Conversion,   subclasses 22+ for electronic keyboard or keypad, per se.
345Computer Graphics Processing and Selective Visual Display Systems,   subclasses 168+ for keyboard as input device for providing selective electrical control in selective display systems.
  
[List of Patents for class 340 subclass 425.1]    425.1REPEATER IN UNSPECIFIED TYPE COMMUNICATIONS LINE OR CHANNEL (E.G., RELAY STATION):
 This subclass is indented under the class definition.  Subject matter comprising a generically recited transmission path (e.g., telecommunications or communications line) having signal retransmitting or amplifying equipment in the path.
(1) Note. This subclass is directed to such subject matter in which the line is not identifiable as a particular communication line (e.g., telephone, telegraph).

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178Telegraphy,   subclasses 70+ for a telegraph repeater.
330Amplifiers,   appropriate subclasses for an amplifier.
370Multiplex Communications,   subclass 274 , 279, 293, 315+, 492, and 501+ for repeaters used in multiplex communications.
375Pulse or Digital Communications,   subclasses 211+ for a pulse or digital signal repeater.
379Telephonic Communications,   subclasses 338+ for a telephone repeater.
455Telecommunications,   subclasses 7+ for a carrier wave repeater.
  
[List of Patents for class 340 subclass 425.2]    425.2Power control:
 This subclass is indented under subclass 425.1.  Subject matter comprising means for controlling power supplied to the repeater.
  
[List of Patents for class 340 subclass 425.5]    425.5LAND VEHICLE ALARMS OR INDICATORS:
 This subclass is indented under the class definition.  Subject matter including systems or devices with an alarming or indicating function mounted on, or carried within, a land vehicle.

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500+,for systems having generic condition responsive alarms or indicators.
901+,for vehicle mounted alarms or indicators which respond to a condition or stimulus external to the vehicle.

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116Signals and Indicators,   subclasses 28+ for similar devices which are nonelectrically actuated.
  
[List of Patents for class 340 subclass 426.1]    426.1Of burglary or unauthorized use:
 This subclass is indented under subclass 425.5.  Subject matter in which an alarm or indicator is activated in response to an attempt at unauthorized entry or use of the vehicle.
(1) Note. Classification here requires significant combination of burglar alarm with vehicle.

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500through 693.12 , for burglar alarms, in general.

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180Motor Vehicles,   subclasses 287 through 289for antitheft systems which prevent unauthorized use by controlling one or more systems during attempted operation of the vehicle, as by: (1) application of the brakes, (2) stoppage of fuel supply, or (3) opening of the ignition circuit in response to a timer.
307Electrical Transmission or Interconnection Systems,   subclasses 10.2 through 10.5for antitheft systems which prevent activation of the ignition or starter systems of a vehicle.
  
[List of Patents for class 340 subclass 426.11]    426.11Including immobilization:
 This subclass is indented under subclass 426.1.  Subject matter wherein the vehicle may be made inoperative.
  
[List of Patents for class 340 subclass 426.12]    426.12User activated (e.g., car-jacking, etc.):
 This subclass is indented under subclass 426.11.  Subject matter wherein an immobilization condition is initiated through input from an external source.
  
[List of Patents for class 340 subclass 426.13]    426.13Remote control:
 This subclass is indented under subclass 426.1.  Subject matter wherein operation of the vehicle alarm or indicator is controlled at a distance therefrom by a separate device.
  
[List of Patents for class 340 subclass 426.14]    426.14Programmable:
 This subclass is indented under subclass 426.13.  Subject matter wherein operation of the remote control unit is modifiable by changing its programming.
  
[List of Patents for class 340 subclass 426.15]    426.15Status indication:
 This subclass is indented under subclass 426.13.  Subject matter wherein the remote control system includes some humanly perceptible indication of system status.
  
[List of Patents for class 340 subclass 426.16]    426.16Transmitter and receiver in vehicle:
 This subclass is indented under subclass 426.13.  Subject matter wherein a vehicular transmitter and receiver are recited.
  
[List of Patents for class 340 subclass 426.17]    426.17Transmitter on user:
 This subclass is indented under subclass 426.13.  Subject matter wherein a transmitter carried by or attached to a user is recited.
  
[List of Patents for class 340 subclass 426.18]    426.18Remote alarm:
 This subclass is indented under subclass 426.1.  Subject matter wherein the alarm or indication takes place at a location distant from the vehicle.
  
[List of Patents for class 340 subclass 426.19]    426.19Using GPS (i.e., location):
 This subclass is indented under subclass 426.18.  Subject matter wherein Global Positioning System is utilized to determine location of a vehicle.

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342Communications: Directive Radio Wave Systems and Devices (e.g., Radar, Radio Navigation),   subclasses 357.2 through 357.78for directive position indicating using GPS.
701Data Processing: Vehicles, Navigation and Relative Location,   subclasses 468 through 491for navigation having significant data processing which uses GPS.
  
[List of Patents for class 340 subclass 426.2]    426.2Cellular:
 This subclass is indented under subclass 426.18.  Subject matter wherein a cellular or zoned system is utilized to determine location of a vehicle.

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370Multiplex Communications,   subclasses 328 through 338for wireless multiplex communication having plural contiguous regions served by respective fixed stations.
455Telecommunications,   subclasses 422 through 460for zoned or cellular telephone system.
  
[List of Patents for class 340 subclass 426.21]    426.21Paging:
 This subclass is indented under subclass 426.18.  Subject matter wherein a selective call receiver system is utilized.

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7.1through 7.63 , for selective paging systems, in general.
  
[List of Patents for class 340 subclass 426.22]    426.22Local indication:
 This subclass is indented under subclass 426.1.  Subject matter wherein indication of vehicle burglary or unauthorized use is provided in the immediate vicinity of a vehicle.
  
[List of Patents for class 340 subclass 426.23]    426.23Exterior of vehicle:
 This subclass is indented under subclass 426.22.  Subject matter wherein indication of burglary or unauthorized use is provided on the outside surface of the vehicle.
  
[List of Patents for class 340 subclass 426.24]    426.24Including specified sensor:
 This subclass is indented under subclass 426.1.  Subject matter wherein the burglary or unauthorized use alarm or indication system utilizes a particular device which is responsive to an ambient condition.
  
[List of Patents for class 340 subclass 426.25]    426.25Plural diverse sensors:
 This subclass is indented under subclass 426.24.  Subject matter including multiple devices responsive to differing ambient conditions.
  
[List of Patents for class 340 subclass 426.26]    426.26Detecting intruder energy (e.g., infrared, etc.):
 This subclass is indented under subclass 426.24.  Subject matter wherein some type of energy associated with an intruder in a vehicle compartment is detected.
(1) Note. Also included here is detecting intruder motion within a vehicle compartment.
  
[List of Patents for class 340 subclass 426.27]    426.27Window (i.e., glass):
 This subclass is indented under subclass 426.24.  Subject matter wherein a condition of vehicle window glass is detected.
  
[List of Patents for class 340 subclass 426.28]    426.28Door or lock:
 This subclass is indented under subclass 426.24.  Subject matter wherein a condition of a vehicle door or its respective lock is detected.
  
[List of Patents for class 340 subclass 426.29]    426.29Trunk or hood:
 This subclass is indented under subclass 426.24.  Subject matter wherein a condition of a vehicle trunk or hood is detected.
  
[List of Patents for class 340 subclass 426.3]    426.3Ignition switch:
 This subclass is indented under subclass 426.24.  Subject matter wherein a condition of a vehicle switch used to activate ignition is detected.
  
[List of Patents for class 340 subclass 426.31]    426.31Steering wheel:
 This subclass is indented under subclass 426.24.  Subject matter wherein the condition of a vehicle steering wheel is detected.
  
[List of Patents for class 340 subclass 426.32]    426.32Brake:
 This subclass is indented under subclass 426.24.  Subject matter wherein a condition of a device which slows a vehicle by friction is detected.
  
[List of Patents for class 340 subclass 426.33]    426.33Wheel/tire:
 This subclass is indented under subclass 426.24.  Subject matter wherein a condition of a vehicle tire or the wheel on which it is mounted is detected.
  
[List of Patents for class 340 subclass 426.34]    426.34Accessory (e.g., speaker, radio face plate, etc.):
 This subclass is indented under subclass 426.24.  Subject matter wherein a condition of an item unessential to the basic operation of a vehicle is detected.
  
[List of Patents for class 340 subclass 426.35]    426.35Including programmable key:
 This subclass is indented under subclass 426.1.  Subject matter including a door lock activating device whose operation may be modified.
  
[List of Patents for class 340 subclass 426.36]    426.36Including keyless entry:
 This subclass is indented under subclass 426.1.  Subject matter including access to a vehicle provided by other than a key.
  
[List of Patents for class 340 subclass 427]    427Of motorcycles or bicycles:
 This subclass is indented under subclass 426.1.  Subject matter wherein the vehicle is a two-wheeled type either motorized or manually propelled.
  
[List of Patents for class 340 subclass 428]    428Responsive to change in voltage or current in a vehicle electrical system:
 This subclass is indented under subclass 426.1.  Subject matter including alarms which are actuated by direct sensing of changes in current or voltage within any existing electrical circuit (e.g., domelight or starter) of the vehicle.
  
[List of Patents for class 340 subclass 429]    429Responsive to inertia, vibration, or tilt:
 This subclass is indented under subclass 426.1.  Subject matter in which the alarm is sensitive to vibrations or other motions of a vehicle caused by an intruder’s actions.

SEE OR SEARCH THIS CLASS, SUBCLASS:

566,for vibration sensitive intrusion alarms, per se.
  
[List of Patents for class 340 subclass 430]    430With entrance/exit time delay:
 This subclass is indented under subclass 426.1.  Subject matter wherein actuation of the alarm is delayed for a predetermined time interval to allow a legitimate user of the vehicle to enter or exit the vehicle without sounding the alarm.
  
[List of Patents for class 340 subclass 431]    431For trailer:
 This subclass is indented under subclass 425.5.  Subject matter wherein the vehicle is a trailer or a motor vehicle combined with a trailer.

SEE OR SEARCH THIS CLASS, SUBCLASS:

687,for condition responsive indicators which respond to the connection or disconnection of circuits of general utility.

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307Electrical Transmission or Interconnection Systems,   subclass 10.8 for trailer lighting circuits with significant recitation of the means for coupling with the circuits of a towing vehicle.
  
[List of Patents for class 340 subclass 432]    432For bicycle:
 This subclass is indented under subclass 425.5.  Subject matter wherein the vehicle is a bicycle.

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315Electric Lamp and Discharge Devices: Systems,   subclass 78 for generator powered vehicle lighting systems, per se.
362Illumination,   subclasses 473+ for bicycle signal light systems in combination with illuminating systems.
  
[List of Patents for class 340 subclass 433]    433For school bus:
 This subclass is indented under subclass 425.5.  Subject matter wherein the vehicle is a school bus.
  
[List of Patents for class 340 subclass 434]    434For taxi:
 This subclass is indented under subclass 425.5.  Subject matter wherein the vehicle is a taxicab.

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180Motor Vehicles,   subclass 288 for a motor vehicle provided with a safety-promoting means which is responsive to the failure of a taxicab operator to activate the vehicle’s fare meter upon the boarding of a passenger.
  
[List of Patents for class 340 subclass 435]    435Of relative distance from an obstacle:
 This subclass is indented under subclass 425.5.  Subject matter including indicators which enable a driver to estimate the relative distance to an obstacle such as another vehicle.
  
[List of Patents for class 340 subclass 436]    436Of collision or contact with external object:
 This subclass is indented under subclass 425.5.  Subject matter including systems which indicate contact between the vehicle and an external object.
(1) Note. Systems classified here must have significant alarm or indication function.

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180Motor Vehicles,   subclasses 271+ for systems with a control function or other nonalarm response to contact with an external object.
  
[List of Patents for class 340 subclass 437]    437Curb:
 This subclass is indented under subclass 436.  Subject matter in which the external object is a curb.
  
[List of Patents for class 340 subclass 438]    438Internal alarm or indicator responsive to a condition of the vehicle:
 This subclass is indented under subclass 425.5.  Subject matter wherein the alarm or indicator is actuated in response to a specific condition of the vehicle and the alarm or indicator communicates with an occupant of the vehicle (e.g., the driver).
(1) Note. Included in this and the indented subclasses are: (a) fully automatic alarms and indicators (e.g., fluid level indicators) and (b) indicators which automatically respond to a manual actuation of a system (e.g., gear position indicators.

SEE OR SEARCH THIS CLASS, SUBCLASS:

286.01+,for automatic or manual alarms and indicators having only nominal vehicle structure.
901+,for vehicle mounted alarms or indicators which respond to a condition or stimulus external to the vehicle.
  
[List of Patents for class 340 subclass 439]    439Operation efficiency (e.g., engine performance, driver habits):
 This subclass is indented under subclass 438.  Subject matter wherein the degree of efficiency in the operation of the vehicle is indicated.
(1) Note. Included here are devices which indicate: (1) relative fuel economy, (2) erratic driving behavior, or (3) other factors related to improper operation of the vehicle.

SEE OR SEARCH THIS CLASS, SUBCLASS:

575,and 576, for devices which determine driver capability or alertness.
  
[List of Patents for class 340 subclass 440]    440Tilt, imbalance, or overload:
 This subclass is indented under subclass 438.  Subject matter including systems which inform the operator of an unsafe load or weight distribution on the vehicle.
  
[List of Patents for class 340 subclass 441]    441Speed of vehicle, engine, or power train:
 This subclass is indented under subclass 438.  Subject matter including alarms or indicators which respond to the speed of the vehicle or of a component of its power train.

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466,for speed responsive alarms or indicators which communicate with persons outside the vehicle.

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180Motor Vehicles,   subclasses 170+ for systems in which the speed responsive signal performs a direct control function in one or more of the vehicle’s systems.
  
[List of Patents for class 340 subclass 442]    442Tire deflation or inflation:
 This subclass is indented under subclass 438.  Subject matter wherein the specific condition is a deviation from the proper inflation of a pneumatic tire.
(1) Note. This is the repository for on-board electric alarms or indicators of under inflation in vehicle mounted pneumatic tires and of unbalanced inflation in vehicle mounted paired (dual) tires.
(2) Note. The alarm or indicator here is triggered by the inflation pressure falling below a preset limit. Indicators which directly report a quantitative measurement of the tire pressure are classified in Class 73.

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73Measuring and Testing,   subclasses 146+ for quantitative measurement of pneumatic tire pressure.
116Signals and Indicators,   subclasses 34+ for nonelectric tire deflation alarms or indicators.
152Resilient Tires and Wheels,   subclasses 415+ and 418+ for systems which maintain tire air pressure by means of an on-board air supply.
  
[List of Patents for class 340 subclass 443]    443By indirect detection means (e.g., height measurement):
 This subclass is indented under subclass 442.  Subject matter wherein the deviation from proper inflation pressure is determined from a measurement of a parameter other than air pressure.
  
[List of Patents for class 340 subclass 444]    444Relative wheel speed:
 This subclass is indented under subclass 443.  Subject matter wherein the measured parameter is the relative rotational speed of two or more wheels of the vehicle.
  
[List of Patents for class 340 subclass 445]    445With particular telemetric coupling:
 This subclass is indented under subclass 442.  Subject matter including systems in which a signal, generated by a sensor on the rotating wheel, is transmitted to an alarm or indicator on a nonrotating portion of the vehicle by means other than direct conduction of electricity.
  
[List of Patents for class 340 subclass 446]    446Acoustic wave:
 This subclass is indented under subclass 445.  Subject matter in which the signal is carried by sound waves generated by a device mounted on the rotating wheel.

SEE OR SEARCH CLASS:

367Communications, Electrical: Acoustic Wave Systems and Devices,   subclass 13 , 117, and 137+ for generic acoustic wave transmission systems.
  
[List of Patents for class 340 subclass 447]    447Radio wave:
 This subclass is indented under subclass 445.  Subject matter in which the sig