This is the general class for the pumping of fluids, and includes the pumping of slurries, fluent material and the
like if handled in a manner not inconsistent with the handling of fluids. With the exception of "gettering pumps" as discussed in Lines With Other Classes and Within This Class, below, a pump is defined as means to move a fluid by taking it from one place or location and moving it to another place or location different from whence it came, the pump, therefore having an inlet and an outlet for the pumped fluid which are separate and distinct.
The pumping of the fluid is generally accomplished by action thereon of a mechanical member (e.g., piston) or by contact or entrainment with another fluid (e.g. jet pumps). Also, the pumping may be accomplished by the direct action on the pumped fluid of an electric or magnetic force (e.g., electromagnetic pumps). However, for the line with respect to "ion pumps", see Lines With Ohter Classes and Within This Class and Subclass References to the Current Class, below.
VACUUM FORMATION BY GETTERING
This class is the residual home for the formation of a vacuum in an enclosed space by a gettering action; a getter being a material which when placed in an enclosed space reduces the gas or vapor content of the space either by a chemical or physical action. Also, included are those devices and processes in which the fluid is ionized to permit or enhance the gettering action. These devices are often termed "getter-ion pumps". See the notes and search notes in subclasses 48 and 49 for a statement of the lines.

LINES WITH OTHER CLASSES AND WITHIN THIS CLASS
LINE WITH CLASS 313 AND CLASS 315
For the line with Classes 313, Electric Lamp and Discharge Devices and 315, Electric Lamp and Discharge Devices: Systems, with respect to "ion pumps", see Subclass References to the Current Class, below.
RELATIONSHIP TO CLASS 91, MOTORS: EXPANSIBLE CHAMBER TYPE
Refer to Lines With Other Classes and Within This Class in the class definition of Class 91 for a statement of the line between Classes 91 and 417.
RELATIONSHIP TO CLASS 92, EXPANSIBLE CHAMBER DEVICES
Class 92 is directed to expansible chamber devices, per se, and with respect to nonrotary expansible chamber pumps is related to Class 417 as a subcombination thereof. Class 92 is limited to expansible chamber devices in which the working member has an oscillating or reciprocating motion to expand and contract the chamber. Thus, Class 92 cannot take the subcombination of any rotary expansible chamber pump. See the note below regarding the relationship of this class (417) and Class 418, Rotary Expansible Chamber Devices, for the disposition of this art.
Set forth below are the lines between Class 92 and Class 417 as they relate to nonrotary expansible chamber pumps:
A. With Drive Means
1. Motor Driven
Class 92 excludes motor driven expansible chamber devices when the motor is significantly claimed. See (2) Note in Class 417 subclass 321 for a statement of what constitutes a significantly claimed motor.
2. Operated By Art Device
Class 92 excludes an expansible chamber pump mounted upon or adjacent to an art device to be operated thereby. See Class 417 subclasses 229+ for this subject matter and for a definition of an art device.
3. Other Drive Mechanism
Other specific means to drive an expansible chamber pump such as gearing, linkage, etc., including disconnectable drives are not excluded from Class 92.
B. Valving
1. Pump Fluid
Class 92 excludes any expansible chamber pump which includes control of the pump fluid by a valving action. Thus, any claimed valving of pump fluid of an expansible chamber pump is sufficient to preclude classification in Class 92 even though the valving claimed may not be all of the valving necessary to cause the pump to operate in the intended manner.
2. Nonpump Fluid
Class 92 does not exclude valving of nonpump fluid as, for example, valving for lubricant, coolant, sealant, etc.
C. With Diverse Pump
An expansible chamber pump in combination with another pump of a different type (i.e., which, per se, would not be classified in Class 92) is excluded from Class 92 unless the pump of a different type is a mere auxiliary of the expansible chamber pump (i.e., lubricant or coolant pump, etc.).
Relationship to Class 137, Fluid Handling. The line between Classes 137 and 417 is generally that of combination and subcombination. Class 137 generally provides for fluid handling systems and Class 417 generally provides for motor driven pumps and pumps, per se. There are certain areas of
subject matter which are considered to be peculiar to pumps and their operation and are considered as exceptions to the general rule stated above. These exceptions and other detailed lines will be set out below.
D. Pump-Tank Relationship
The combination of a pump and a tank generally will be classified in Class 137. However, a single nominally recited tank, reservoir, chamber, pump or other similar fluid holding means will be considered as merely a flow line or conduit and will be classified in Class 417. See (9) Note in the Class Definition of Class 222, Dispensing, regarding other pump-tank relationships.
E. Pump-Accumulator Relationship
An accumulator or surge dampening device is usually a device having a single fluid opening and is connected to a pump inlet or outlet for the purpose of maintaining a smooth flow to or from the pump. Such devices when disclosed for the purpose of surge dampening or insuring smooth flow and claimed in combination with a pump are classified in Class 417.
F. Pump-Liquid Accumulation Control Relationship
1. A pump claimed in combination with a liquid accumulation controlled valve is classified in Class 137 with the following exceptions which are classifiable in Class 417:
a. When the liquid accumulation responsive valve controls a liquid flow to the pump or a gas relief from the pump is for the specifically disclosed purpose of priming the pump, see Class 417, subclasses 200 and 435.
b. When the liquid accumulation responsive valve functions as a pump valve in a fluid displacement-type pump, see Class 417, subclass 65 in general and subclasses 126+ and 138 in particular.
c. When the liquid accumulation responsive valve is the distributor of an expansible chamber-type pump, see Class 417, subclass 297.5.
2. A Jet pump claimed in combination with liquid level responsive regulating means therefor is classified in Class 417, subclass 182.5.
3. A pump claimed in combination with liquid accumulation-controlled drive transmission therefor is classified in Class 417, subclass 211.5.
4. A pump claimed in combination with a liquid accumulation controlled-drive motor therefor is classified in Class 417, subclasses 36+.
G. Pump-Plural Serial Valve Relationship
A pump claimed in combination with plural serial valves in either or both an inlet or an outlet flow path and without any branched flow paths is classifiable in Class 417. The rule for serial valves applies even though one or more of the valves is manually operated or condition responsive, see Class 417 for serial pump distributors, for a manually operated valve in serial relationship with a pump distributor, and for a condition responsive valve in combination with a pump. (See Subclass References to the Current Class, below.)
H. Pump-Main Flow Path and Branched Flow Path Relationship
Generally a branched flow system having a main flow path and a branched flow path, whether including a pump or not, is classifiable in Class 137. However, there are a number of exceptions which usually depend upon the disclosure in the particular patent as set forth below.
1. A pump having plural branched flow paths, whether valved or not, communicating with a single source or receiver is classifiable in Class 417. Where there is no specific disclosure of the source or receiver for the flow paths, the disclosure will be considered as if there were a single source or receiver and will be classified in Class 417.
2. A pump having a main flow path and a branched flow path, each communicating with separate sources or receivers is classifiable in Class 417 if:
a. the source or receiver for the main flow path is unclaimed or nominally claimed and
b. the branched flow path is specifically disclosed as a relief inlet or outlet for the pump, a priming inlet to the pump, a bypass around the pump, or a vent, waste or drain outlet from the pump, and either(1) the main flow path is uncontrolled or (2) the main flow path is controlled and the branched flow line is (a) uncontrolled, (b) manually controlled or (c) controlled by a condition responsive valve responding to a condition in the main flow path which is sensed between the pump and the main flow path controller.
I. Condition Responsive Control of Pump Drive Motor
A motor driven pump having a condition responsive control for controlling the operation of the motor is classifiable in Class 417. The combination of a pump and a disconnectable drive, clutch or variable transmission having a condition responsive control is classifiable in Class 417. (See Subclass References to the Current Class, below.)
J. Direct Response Valve-Pump Cylinder Relationship
The combination of one or more direct response valves of the
type classifiable in Class 137, subclasses 511+ and a nominally recited cylinder is classifiable in Class 137. The specific recitation of a cylinder head is not considered to be a specific recitation of the cylinder.
RELATIONSHIP TO CLASS 415, ROTARY KINETIC FLUID MOTORS OR PUMPS
Class 415 takes rotary, nonexpansible chamber-type pumps. However, Class 417 provides for rotary, nonexpansible chamber-type pumps in certain combinations as enumerated below. Unless specifically excluded below, a patent to a rotary nonexpansible chamber-type pump, as defined in the class definition of Class 415, will be classified as an original in Class 415 as opposed to Class 417.
1. With Drive Means
a. Motor Driven
Class 415 excludes motor driven rotary nonexpansible chamber-type pumps when the motor-pump combination is significantly claimed. For a detailed explanation of what constitutes a significantly claimed motor-pump combination see Subclass References to the Current Class in this class and Lines With Other Classes and Within This Class, General Relationship With Other Classes, paragraph A in the Class 415 definition.
b. Operated By Art Device
A rotary, nonexpansible chamber- type pump operated by an art device is excluded from Class 415. See Class 417 for this subject matter and the definition of an art device. (See Subclass References to the Current Class, below.)
c. Other Drive Mechanism
Other specific means to drive a rotary, nonexpansible chamber pump such as gearing, linkage, etc., including disconnectable drives (e.g., clutch) are not excluded from Class 415.
2. With Diverse Pump
The combination of a rotary, nonexpansible chamber-type pump with another pump of a different type (e.g., recipro- cating, rotary expansible chamber, etc.), is excluded from Class 415 and is classified in Class 417 unless the different type pump is a mere auxiliary of the rotary, nonexpansible chamber-type pump (e.g., lubricating or coolant pump). In the latter case, classification in Class 415 is proper.
Relationship to Class 418, Rotary Expansible Chamber Devices
Class 418 takes rotary expansible chamber pumps even though the disclosure and claims may be restricted to pump use. In some ways Class 418 may be considered to be less
comprehensive than Class 417 and rotary expansible chamber-type pumps in certain combinations enumerated below will be classified in Class 417 rather than Class 418. Unless specifically excluded below a patent to a rotary expansible chamber type as defined in the Class Definition of Class 418 will be classified as an original in Class 418 as opposed to Class 417:
3. With Drive Means
a. With Motor
Class 418 excludes motor driven rotary expansible chamber devices when the motor is significantly claimed even if the motor is of the rotary expansible chamber type. For a detailed explanation of what constitutes a significantly claimed motor; see Subclass References to the Current Class, below.
b. Operated By Art Device
A rotary expansible chamber pump mounted upon or adjacent an art device to be operated thereby is excluded from Class 418. See this class (417) for this subject matter and the definition of an art device. (See Subclass References to the Current, Class, below.)
c. Other Drive Mechanism
Other specific means to drive the pump such as gearing, linkage, etc., including disconnectible drives (e.g., clutch) are not excluded from Class 418 even if the drive is not reversible.
4. Valving
a. Cyclic or Position Responsive
Class 418 will take rotary expansible chamber pumps combined with valves for the pumped fluid which have a repetitive pattern or cycle of operation which is related to the rotation of the pump. These may be termed cyclic or position responsive valving and include the opening and closing of inlet or exhaust ports by the movement of the rotor past same. The adjustment of this type valving so as to provide, for example, early cutoff of supply is also included in Class 418. The inclusion, however, of means to cutoff operation of the pump after a predetermined number of revolutions is excluded from Class 418, this being considered to be a dispensing feature for Class 222, Dispensing.
b. In-Line
An in-line valve is defined as one situated in the normal line of pumped fluid flow which acts in some way to control the flow in that line, but not by diverting the fluid to a second or subsidiary flow line (e.g., bypass). Class 418
will take all in-line valves combined with a rotary expansible chamber pump which are controlled by some means other than a condition of the pumped fluid (e.g., manual throttle) and will also take those which are actuated directly by the application of the pumped fluid thereto (i.e., direct response valves). Those devices including in-line valves which are controlled by a pumped fluid condition (e.g., pressure, flow) and in which said valves are not of the direct response type are excluded from Class 418 and will be classified in Class 417 if otherwise appropriate.
c. Branched Flow or By-pass
i. Separate Valve Means
Those rotary expansible chamber devices which include a separate valve means (as opposed to a movable chamber part as discussed in paragraph (2) immediately below) to divert or bypass all or a portion of the pumped fluid from its normal or first course of flow to a second or waste path are excluded from Class 418 regardless of whether the valve is manually or otherwise controlled unless the diverted fluid is used merely for a pump perfecting function such as lubricating, cooling, vane bias, etc.
ii. Movable Chamber Part
Many rotary expansible chamber pumps have expansible chamber parts which are in running contact with other chamber parts and which move from a "normal" or contacting position to a noncontacting position and in so moving allow passage or bypass of pumped fluid thereby. Exemplary of such parts are vanes, abutments, end plates, etc., and such parts are usually biased into contacting position by means such as a spring, pressure fluid conducted from the expansible chamber or the like. Such devices are not excluded from Class 418 even though the yielding of the part may be considered to be performing a bypassing function. However, if pumped fluid is conducted to the part for such a biasing function (e.g., behind end plate) and there is a controlled application of fluid to or release of the fluid from the bias area for the disclosed purpose of bypassing said fluid or conducting it to another point of use such devices are excluded from Class 418 and are classified in Class 417 if otherwise appropriate. Also Class 418 excludes a pump having a movable chamber part whose movement is controlled in response to the pressure or flow of the pumped fluid of a second rotary expansible chamber device.
d. Reversible or Unidirectional Flow
Some rotary expansible pumps are provided with adjustable or self-acting means by which for a given direction of rotation of the pump the flow may be reversed in the line in which the fluid is being pumped, or upon reversal of the direction of rotation of the pump the flow will continue in the same
direction in the pumped fluid flow line. This, per se, will not serve to preclude classification in Class 418.
5. With Diverse Pump
The combination of a rotary expansible chamber pump with another pump of a different type (centrifugal, reciprocation, etc.), is excluded from Class 418 and is classified in Class 417 unless the different type pump is a mere auxiliary of the rotary expansible chamber pump as, for example, a lubricating or cooling fluid pump, etc. In the latter case classification in Class 418 is proper.

SEE OR SEARCH THIS CLASS, SUBCLASS:
1 for a motor driven pump having a condition responsive control for controlling the operation of the motor.
48 and 49, for a statement of the lines see the notes and search notes in these subclasses.
49 for ion pumps.
50 in which pumping may be accomplished by the direct action on the pumped fluid of an electric or magnetic force (e.g., electromagnetic pumps).
212 for the combination of a pump and a disconnectable drive, clutch or variable transmission having a condition responsive control.
229 for a rotary, nonexpansible chamber-type pump operated by an art device.
229 for a rotary expansible chamber pump mounted upon or adjacent an art device to be operated thereby.
279 for a condition responsive valve in combination with a pump, subclass 441 for a manually operated valve in serial relationship with a pump distributor, and subclass 456 for serial pump distributors.
321 for a detailed explanation of what constitutes a significantly claimed motor-pump combination see the (2) Note in this subclass.

REFERENCES TO OTHER CLASSES

SEE OR SEARCH CLASS:
62, Refrigeration, subclass 55.5 for cold traps including those in which the sole disclosure is to act as a "pump" and for cold traps combined with a nominally claimed mechanical or roughing pump. Class 417, however, takes the combination of a cold trap and a significantly claimed device of this class (pump).
73, Measuring and Testing, subclass 168 for means to test blowers and pumps.
119, Animal Husbandry, 72 for animal watering devices including animal operated pumps combined with a trough for receiving the pumped water.
166, Wells, appropriate subclasses for pumps combined with well processes or features especially, 369 for well production processes including pumping steps, subclasses 53+ for automatic wells including control of a pump in response to a well condition, subclass 54.1 for wells with means for separately pumping from plural sources in a well, subclasses 61 and 62 for heating, refrigerating or insulating means with an eduction pump or plunger in the well, subclasses 68+ for above and below ground structure including an eduction pump or plunger in the well, subclasses 105+ for a well with an eduction pump or plunger in the well, subclass 176 well brushing, scraping, cutting or punching-type cleaners on a pump sucker rod, subclasses 316+ for valves including well pump or tubing drain valves.
406, Conveyors: Fluid Current, appropriate subclasses for systems which transport solids by means of a fluid current, and which include a pump for generating the fluid current. See particularly 10 for control circuits for pump drives, which are responsive to a sensed condition, and subclasses 45 and 46+ for subject matter relating to the pumping and transportation of slurries.
415, Rotary Kinetic Fluid Motors or Pumps, for rotary fluid kinetic energy devices disclosed as a pump or a motor. Class 415 will also take a plurality of such devices in which each is a pump or each is a motor. Class 417 will take a rotary fluid kinetic energy motor driving a rotary fluid kinetic energy pump if a claim sets out that one is a motor and one is a pump. However, Class 415 will take this disclosed motor driven pump relation if a claim does not reflect that one is a motor and the other a pump.
416, Fluid Reaction Surfaces (i.e., Impellers), appropriate subclasses for motor driven fluid reaction surfaces (i.e., impellers) in which there is no claimed fluid confining or deflecting means, upstream or downstream of or encompassing the impeller.
418, Rotary Expansible Chamber Devices, for rotary expansible chamber devices disclosed as a pump or a motor. Class 418 will also take a plurality of such devices in which each is a pump or each is a motor. Class 418 will not take a rotary expansible chamber-type motor driving a rotary expansible chamber-type pump if a claim recites one as a motor and one as a pump. However, Class 418 will take this disclosed motor driven pump relationship if a claim does not reflect that one is a motor and the other a pump.
505, Superconductor Technology: Apparatus, Material,
Process, 150 for high temperature (T[subscrpt]c[end subscrpt] 30 K) superconducting devices, and particularly subclass 165 for pumps utilizing a suspension of superconducting particulate material, and cross-reference art collection 910 for pumps utilizing superconducting materials.
623, Prosthesis (i.e., Artificial Body Members), Parts Thereof, or Aids and Accessories Therefor, subclass 3 for pumps solely disclosed as artificial hearts.

This subclass is indented under the class definition. Subject matter in which the pump is provided with (1) a motor to drive the fluid moving element thereof, (2) control means to control the motor in some manner and (3) a separate sensing means which is responsive to the occurrence of a condition or a change in condition of either the pump or the fluid being pumped and which causes operation of the control means to alter the operation of the motor.
(1) Note. Sensing of the speed of a motor which is mechanically connected to the pump for driving same is considered as sensing a condition of the pump and is included under this definition.

SEE OR SEARCH THIS CLASS, SUBCLASS:
187 for regulation of a jet pump by motive fluid control, jet pumps not being considered as motor driven.
196 for diverse pumps having condition responsive control of a drive motor for one pump which is a mere priming pump for another.
212 for condition responsive control of a pump drive transmission.
321 for pumps which are cyclically driven by a cyclically operable motor and in which the control of the motor is caused to operate cyclically by a cyclically changing condition of the pump or pump fluid such that this change of condition and its control of the motor are the normal manner of operation.

This subclass is indented under subclass 1. Subject matter comprising at least two pumps which are either (1) independently driven by separate drive motors, (2) adapted to be supplied from separate sources, or (3) adapted to deliver to separate destinations.
(1) Note. For purposes of this definition, a single cylinder having a pumping member (e.g., piston) which serves to divide the cylinder into two pumping chambers is considered to comprise plural pumps if the pump chambers are adapted to deliver fluid to separate destinations or receive fluid from separate sources.
(2) Note. To be included under this definition, the plural pumps must supply fluid for external use (i.e., one may not be a mere auxiliary of another such as a lubricant, coolant, or priming pump).
(3) Note. An entrainment-type pump (e.g., jet pump) has not been construed as motor driven and consequently the combination of a condition responsive motor driven pump and jet pump is not included under part (1) of the above definition and such combination would be classified here only if the motor driven pump and jet pump respectively deliver to separate destinations or receive fluid from separate sources.

This subclass is indented under subclass 2. Subject matter in which each of said plural pumps has its respective inlet or outlet connected to a single flow line so that fluid will flow either to or from said pumps through said flow line.
(1) Note. For purposes of this definition, a common inflow or outflow line is defined as a conduit or tank in that portion of the system which handles fluid flow to or from two or more pumps. Patents disclosing parallel flow paths in which a pressure condition is sensed in one path only, but for the disclosed purpose of indicating the common flow line pressure condition, have been placed in subclass 2, above, and appropriately cross-referenced into this subclass or those indented hereunder.

This subclass is indented under subclass 3. Subject matter in which sensing means is operative to sense a condition or
change of condition occurring in the fluid in the common flow line joining either the pump inlets or pump outlets.

This subclass is indented under subclass 4. Subject matter in which each of said plural pumps is driven by separate drive motor and the control means is operative to simultaneously or relatively control the operation of each of said plural drive motors.

This subclass is indented under subclass 5. Subject matter in which there is an additional sensing means to sense a condition or change in condition in either (1) a fluid flow line which is peculiar to a single pump, or (2) a pump which is peculiar to a single flow line, said additional sensing means serving to effect operation of the same or different control means.

This subclass is indented under subclass 5. Subject matter in which the control means for the pumps comprise a start and stop device for the motor of each pump and which are related to one another in such a manner that the pumps will either be started or stopped in a certain order in response to changes in conditions sensed by the sensing means.

This subclass is indented under subclass 7. Subject matter having means related to the control means for cyclically changing the order of starting or stopping the pump drive motors.

This subclass is indented under subclass 1. Subject matter in which there is means provided for accumulating or detecting leakage of pump fluid from the pump or system or leakage of an extraneous fluid into the pump or system and the control means acts in response to such leakage to stop operation of the pump motor.
(1) Note. There must be a specific disclosure that the fluid which causes operation of the control means has leaked from the device. The mere possibility of detecting leakage by some conventional means, such as a pressure responsive device, is not sufficient for classification in this subclass.

This subclass is indented under subclass 1. Subject matter in which the drive motor comprises an engine in which fuel is burned in a chamber from which power is directly derived and the control means is operative to either (1) control actuation of a secondary motor which is utilized for initiating operation of the fuel burning engine or (2) control operation of the pump to cause same to be operated as a motor for initiating operation of the fuel burning engine.

This subclass is indented under subclass 1. Subject matter in which the drive motor is of the reciprocating expansible chamber type and derives its power by the burning of fuel in the chamber and in which the piston or working member of the motor is free of any mechanical linkage or gearing which limits its movement to a fixed stroke during its cycle of operation.

This subclass is indented under subclass 1. Subject matter having means related to the sensing means for either (1) causing the state of operation of the drive motor to be maintained for a specified period of time after a condition or change in condition is detected by the sensing means before allowing the state of operation to be changed in
accordance with the sensed condition, (2) allowing the state of operation of the drive motor to be changed in response to a sensed condition and then causing said changed state of operation to be maintained for a specified period of time regardless of further condition changes, (3) causing the control means or sensing means to be ineffective for a specified period of time during motor start up, or (4) altering the effectiveness of the control means for a specified period of time after the sensing means has detected a change in condition.
(1) Note. A fluid dashpot or damper utilizing fluid independent of the pump fluid and which serves only to attenuate the effect of periodic condition fluctuations of short duration is not considered to be a delay or timing means under this definition.

This subclass is indented under subclass 1. Subject matter including a means to supply lubricating, sealing, or cooling fluid to the pump and the sensing means senses a condition or change of condition of said lubricating, sealing, or cooling means and operates the motor control means in response thereto.

This subclass is indented under subclass 1. Subject matter including an additional sensing means operatively connected to the control means, said additional sensing means being responsive to a condition or change of condition (e.g., ambient condition) of the surrounding environment.

This subclass is indented under subclass 1. Subject matter in which there is additionally provided means for transmitting motion from the motor to the pump and control means for either (1) interrupting motion of the pump (e.g., clutch, lock, etc.), (2) varying the rate of motion of the pump (e.g., brake, adjustable gearing, etc.) or (3) changing the swept volume of pumping member or motor working member displacement of an expansible chamber-type pump or motor (e.g., stroke control).

This subclass is indented under subclass 1. Subject matter in which the pump is driven by two or more individual motors, each of said motors having a motor working member for driving the same fluid moving element of the pump and in which at least one of the motors is controlled by the controlling means.

SEE OR SEARCH THIS CLASS, SUBCLASS:
10 for condition responsive control of a starter motor for an internal combustion engine. The starter motor, even though it may incidentally drive the pump while cranking the combustion engine, is not considered to be a separate pump drive motor for this subclass.

This subclass is indented under subclass 1. Subject matter in which the control means comprises two or more controlling elements which are capable of being separately actuated in response to the same or different conditions to separately control the drive motor.

SEE OR SEARCH THIS CLASS, SUBCLASS:
10 for condition responsive control of a starter motor for an internal combustion engine, such apparatus usually incorporating a separate control means for terminating operation of the internal combustion engine.

This subclass is indented under subclass 1. Subject matter comprising a single drive motor controlling element which is caused to be operated in response to means sensing plural conditions which are (1) different in kind, e.g., pressure and flow rate, or (2) if of the same kind, different by the part of the system characterized by the condition, e.g., inlet and discharge pressures of the pump.
(1) Note. The diverse condition may be a condition external of the pump or pump fluid system, e.g., a drive motor
condition.

This subclass is indented under subclass 18. Subject matter in which the sensing means responds to a condition or change of condition on the fluid inlet or intake side of the pump and a condition or change of condition on the fluid outlet or discharge side of the pump.

This subclass is indented under subclass 18. Subject matter in which one of the plural conditions to which the sensing means responds is a change in rate of pump fluid flow to, or from the pump.

This subclass is indented under subclass 18. Subject matter in which the drive motor is of the type which is motivated by a fluid and one of the plural conditions to which the sensing means responds is a condition or change in condition of the motor driving fluid.

This subclass is indented under subclass 18. Subject matter in which one of the plural conditions to which the sensing means responds for causing operations of the single drive motor control element is the rate of speed at which the pump is driven.

This subclass is indented under subclass 22. Subject matter having valve means for varying the flow of fluid being
pumped, there being additionally provided a sensing means having a single sensing part for detecting a condition other than the rate of speed at which the pump is driven, the single sensing means causing operation of both the pump fluid valve means and the single drive motor control element.

This subclass is indented under subclass 22. Subject matter in which the means sensing the rate of speed at which the pump is driven comprises either a secondary pump or an electric generator which is mechanically driven by the pump drive motor for producing a fluid or electric signal, respectively, indicative of the rate of speed at which the pump is driven.

This subclass is indented under subclass 1. Subject matter comprising two or more pressure responsive sensing elements which either simultaneously, successively, or selectively respond to a change in pressure occurring in the same part of the system (e.g., both respond to pump discharge pressure) for effecting operation of a single motor control element.

This subclass is indented under subclass 1. Subject matter including valve means for varying the flow of fluid being pumped, which valve means is operated by sensing the occurrence of a condition or change of condition in the fluid being pumped.
(1) Note. This definition is not intended to include those devices in which there is a single sensing means operating a valve whose sole function is to divert a portion of the pumped fluid to cause operation of the drive motor control means, such devices have been considered to be merely pilot valves for the drive control means.
(2) Note. A direct acting valve, e.g., a check valve which is responsive only to the direction of flow in a line is not included. However, a valve which diverts flow from one line to another, in a branched system, even though dependent only on the direction of flow in the lines is included.
(3) Note. For purposes of this definition, pump fluid includes any fluid which is caused to be moved by the pump. Therefore, a gas vent valve for spoiling a liquid pump by allowing gas to enter the pump is included under this definition. Also, a discriminating valve for allowing gas, but not liquid, to be vented from a liquid pumping system is included.

SEE OR SEARCH THIS CLASS, SUBCLASS:
10 for condition responsive control of pump fluid which is utilized as motive fluid for starting an internal combustion engine drive motor.

This subclass is indented under subclass 26. Subject matter in which means are provided for retarding or delaying actuation of the valve means for the purpose of preventing increase of pressure in the pump until a period of time after the drive motor control means has been adjusted to cause such increase, said valve actuation delaying or retarding means being separate and isolated from the motor control means and having no retarding or delaying effect thereon.
(1) Note. Devices in which the pump fluid valve is caused to be operated in response to the motor control element having been adjusted to a predetermined motor controlling position are not included under this definition in the absence of a separate retarding or delaying means for the valve control means.

This subclass is indented under subclass 26. Subject matter in which the valve means and the control means for the drive motor are both caused to be actuated by a sensing means having a single sensing part for detecting the occurrence of a condition or change of condition.

SEE OR SEARCH THIS CLASS, SUBCLASS:
23 for a common condition sensing element which causes operation of both a pump drive motor control element and a pump fluid control valve.

This subclass is indented under subclass 26. Subject matter in which the valve means is controlled in response to one condition of the system and the control means for the motor is responsive to a second condition which (1) differs in kind from the first, e.g., pressure and flow rate, or (2) if of the same kind, differs by the part of the system characterized by the condition, e.g., inlet and discharge pressures of the pump.

SEE OR SEARCH THIS CLASS, SUBCLASS:
23 for a sensing means responsive to pump speed for causing operation of a pump drive motor control element and a sensing means responsive to a condition other than pump speed for causing operation of a pump fluid control valve.

This subclass is indented under subclass 29. Subject matter in which the fluid control means comprises a valve in the discharge of the pump which is farther from the pump, on the discharge side, than the sensing means for the drive controlling means, said valve being controlled in response to the collection of liquid in a receiver or receptacle located in the pump discharge line.

This subclass is indented under subclass 30. Subject matter in which the drive control means is responsive to the liquid pressure in the pump discharge line.

This subclass is indented under subclass 1. Subject matter in which the condition sensed is a change in the temperature of either the pump or the fluid being moved by the pump.

This subclass is indented under subclass 1. Subject matter in which the control means acts to stop operation of the pump by stopping the drive motor in response to a change of condition but will not again start the pump when the condition returns to normal; the control means requiring the intervention of a human operator to restore the pump to a running condition.

This subclass is indented under subclass 1. Subject matter in which the drive motor comprises an engine in which fuel is burned in a chamber from which the power is directly derived and the control means includes means which acts on the engine to change some operating characteristic thereof.

SEE OR SEARCH THIS CLASS, SUBCLASS:
10 for system condition responsive control of a starter motor for an internal combustion engine driving a pump.
11 for system condition responsive control of a free piston-type internal combustion drive engine.

This subclass is indented under subclass 1. Subject matter in which the drive motor is of the type which is driven directly by wind, (e.g., a windmill), and a receptacle is provided for receiving liquid which is to be pumped or which has been pumped by the pump and the sensing means is responsive to the quantity of liquid collected in the receptacle.

This subclass is indented under subclass 1. Subject matter in which there is provided a receptacle for receiving liquid which is to be pumped or which has been pumped by the pump and the sensing means is responsive to the quantity of liquid in the receptacle.

SEE OR SEARCH THIS CLASS, SUBCLASS:
35 for control of a wind motor in response to liquid accumulation.
182.5 for means for controlling an entrainment-type pump (e.g., jet pump) in response to the level of pumped liquid, subclass 211.5 for means controlling a pump drive transmission (e.g., clutch, cam, etc.) in response to the level of pumped liquid and subclass 297.5 for liquid level control which modifies the operation of an expansible chamber pump distributor.

This subclass is indented under subclass 36. Subject matter in which the sensing means is responsive to movement of the liquid receptacle or an auxiliary liquid receptacle in communication therewith, said movement being caused by the weight of the liquid collected therein.

This subclass is indented under subclass 36. Subject matter in which the sensing means comprises a device which responds to liquid pressure changes and is either in fluid communication with or mounted within the receptacle in a manner such that the liquid must either reach a predetermined level before it may pass to the pressure sensing device or exert sufficient pressure on the sensing device to cause actuation thereof.
(1) Note. A movable receptacle is not considered a pressure sensor under this definition, such devices being classified in subclass 37 above.
(2) Note. The liquid pressure may be transmitted to the sensing means via another liquid (e.g., mercury column).

This subclass is indented under subclass 36. Subject matter in which the pump is driven by a fluid motor and the supply of motive fluid for the fluid motor is in fluid communication with the liquid collecting receptacle.

This subclass is indented under subclass 36. Subject matter in which the sensing means comprises a buoyant element which floats on the surface of the liquid collected in the receptacle.

This subclass is indented under subclass 40. Subject matter in which the pump is driven by a fluid motor and the control means acts to control the flow of fluid to said motor.

This subclass is indented under subclass 1. Subject matter in which the sensing means senses the rate of speed at which the pump is driven.

SEE OR SEARCH THIS CLASS, SUBCLASS:
22 for a single motor control element which is operated in response to means sensing diverse conditions, one of said diverse conditions being the speed of the pump.

This subclass is indented under subclass 1. Subject matter in which the sensing means is responsive to variations in the rate of flow of the fluid flowing to or from the pump.

By control of electric or magnetic drive motor:
This subclass is indented under subclass 1. Subject matter in which the motor is of the type having a working member (e.g., armature) which is motivated by electricity or a
magnetic field.
(1) Note. Collected in this subclass are patents directed to system condition responsive control of drive motors of the type commonly referred to as magnetic or electromagnetic clutches.

Responsive to change in electrical operating characteristic:
This subclass is indented under subclass 44.1. Apparatus wherein the electric drive motor comprises a sensing means where an operating characteristic changes in response to a change in an electrical current drawn by the motor or a change in a voltage across the motor or a change in a phase shift of the motor.

Responsive to pump fluid pressure:
This subclass is indented under subclass 44.1. Apparatus having a sensing means responsive to variation in pressure present in the fluid flowing to or out from the pump and which causes operation of the control means to alter the operation of the motor.
(1) Note. The fluid pressure may be transmitted to the sensing means via another liquid (e.g., mercury column).

Inlet pressure:
This subclass is indented under subclass 44.2. Apparatus wherein the sensing means is located at an inlet side of the pump.

Low pressure stops motor from turning on pump:
This subclass is indented under subclass 44.2. Apparatus wherein the motor comprises an electrical contact having an opened position and a closed position and the contact remains in the opened position as long as the sensed pressure of the fluid remains below a predetermined value.

Mercury switch:
This subclass is indented under subclass 44.2. Apparatus wherein the motor comprises an electrical circuit and the sensing means includes a device which contains mercury which is motivated by the variations in the fluid pressure; the said motivation triggers the electrical circuit of the motor to close or open.

Dial-type sensor:
This subclass is indented under subclass 44.2. Apparatus wherein the motor comprises an electrical circuit and the sensing means includes a dial indicator which has a rotary movement responsive to the fluid pressure and a manually adjustable set point which causes the electrical circuit to open or close when the positions of the indicator and manual set point are properly aligned.

Bellow-type sensor:
This subclass is indented under subclass 44.2. Apparatus wherein the motor comprises an electrical circuit and the sensing means includes a flexible structure which is capable of expanding to increase the volumetric capacity thereof, said structure comprising (a) a tube of flexible material having a circumferentially corrugated or pleated wall, (b) at least four plates, each plate having a central opening therein defining an edge inwardly of the outer peripheral edge thereof, said plates being arranged in superposed relation with adjacent plates secured along their inner and outer edges alternately, or (c) a pair of rigid platelike members pivoted together along a portion of their peripheral edges, the remaining peripheral edge portion of said plates being joined together by a flexible member which is pleated in some position of relative pivotal movement of the platelike members.

Piston-type sensor:
This subclass is indented under subclass 44.2. Apparatus
wherein the motor comprises an electrical circuit and the sensing means includes a plunger or a solid disk which fits snugly into a cylinder and wherein the plunger or the disk moves when subjected to the fluid pressure variation in the cylinder causing the electrical circuit of the motor to close or open.

Diaphragm:
This subclass is indented under subclass 44.2. Apparatus wherein the motor comprises an electrical circuit and the sensing means includes a relatively thin membranelike member having a peripheral edge portion, said member being adapted to be associated with a surrounding or encompassing tubular rigid structure to extend transversely thereof to form a closing wall for said tubular structure, the outer peripheral edge of said membrane being in sealing relationship with the encompassing wall of said tubular structure; said member moves in response to the fluid pressure variation causing the electrical circuit of the motor to close or open.
(1) Note. The membranelike member need not span the entire space within the encompassing wall of the tubular member, but may be in the form of a ring or frustum having the inner peripheral edge thereof in sealing engagement with a rigid element movable relative to and coaxial with the encompassing tubular member.

Subject matter under subclasses 44.1+ in which the motor is electrically operated and the motor or electric supply circuit therefor includes an electrical component (e.g., resistance element, starting winding, etc.) which is either (1) adjustable to change its electrical value or characteristic or (2) capable of being included in or shunted out of the main motor circuit; and in which the control means acts to control the adjustment or shunting of the component in response to the sensed condition.

This subclass is indented under subclass 1. Subject matter in which the motor drive means for the pump is of the type which includes a movable working member which is motivated by a fluid and the control means comprises means for controlling the flow of motive fluid to or from the motor in response to
the sensing means.

SEE OR SEARCH THIS CLASS, SUBCLASS:
21 for a single fluid motor control element which is operated in response to means sensing diverse conditions, one of said diverse conditions being a motive fluid condition.
34 for means for system condition responsive control of an internal combustion-type drive engine.
41 for means for controlling motive fluid to drive motor in response to float means which senses accumulation of pumped liquid in a receiver.

This subclass is indented under subclass 46. Subject matter in which the motor is of the type in which the drive element rotates about an axis and derives its power by the fluid impacting against the drive element.

This subclass is indented under the class definition. Subject matter in which (1) the fluid is pumped by or the pumping effect relies upon the direct action thereon of electrical means or a magnetic field, or (2) the fluid is "pumped" or trapped by means of a getter.
(1) Note. This is the residual home for the creation of a vacuum in an enclosed space by means of a gettering action as defined in (2) Note below. This and indented subclasses include the combination of the chamber to be evacuated and the gettering means. It also includes significant claimed containers holding getter material for disposition in a chamber to be evacuated.
(2) Note. A getter is a material which, when placed in an enclosed space, reduces the gas or vapor content of the space either by a chemical or physical action.

SEE OR SEARCH THIS CLASS, SUBCLASS:
322 for pumps having a chamber which is expanded and contracted by an electrical or magnetostrictive action on the walls thereof.

SEE OR SEARCH CLASS:
75, Specialized Metallurgical Processes, Compositions for Use Therein, Consolidated Metal Powder Compositions, and Loose Metal Particulate Mixtures 255 for a loose metal particle composition.
96, Gas Separation: Apparatus, 108 for solid sorbent apparatus for separating vaporous or gaseous constituents. The subject matter classified in Class 96 may be intended to create a vacuum in an enclosed space, but must selectively separate one constituent from another. Thus, Class 96 does not take solid sorbent apparatus or any other means intended to sorb all of the gas or vapor constituents in a chamber.
204, Chemistry: Electrical and Wave Energy, 192.1 for processes for coating or forming an article by cathode sputtering and subclass 298.01 for cathode sputtering apparatus to coat or form an article.
252, Compositions, 181.1 for getters and gas or vapor generating materials, per se, and also for such materials claimed as being in a container, but where no structure of the container is claimed.
313, Electric Lamp and Discharge Devices, subclasses 545-566 for electric lamps and space discharge devices which include a getter or gas or vapor generating material as a part thereof.
406, Conveyors: Fluid Current, appropriate subclasses for systems which transport solids by means of a fluid current, and which include a pump for generating the fluid current. See particularly 10 for control circuits for pump drives, which are responsive to a sensed condition, and subclasses 45 and 46+ for subject matter relating to the pumping and transportation of slurries.
445, Electric Lamp or Space Discharge Component or Device Manufacturing, 38, 53+ and 73 for methods and apparatus for evacuating electric lamp and space discharge devices and including some step or means limited to the manufacture or repair of electric lamp or space discharge device.

This subclass is indented under subclass 48. Subject matter in which the pumping action is effected by or relies upon the ionization of the pumped fluid by the action of electrical means and including a getter material for the ionized fluid or an additional pump of a different type (e.g., mechanical, diffusion, etc.).
(1) Note. The line between this Class 417 and Classes 313,
Electric Lamp and Discharge Devices and 315, Electric Lamp and Discharge Devices: Systems, in the field of ionic pumps generally falls into two categories as follows: (a) SPACE DISCHARGE AND GETTERING - The distinction between Class 417 and Classes 313 and 315 in the field of creation of a high vacuum involving electrical space discharge with gettering is one of art. Thus, a patent to a space discharge device combined with gettering means (the getter may be an electrode of the space discharge device) in which the sole disclosure is to act as a vacuum pump (i.e., the only disclosed use of the space discharge device is to ionize fluid to be trapped by the getter); or one in which all of the claims are limited to a pumping or vacuum creating function will be classified as an original in Class 417. Conversely, those in which the disclosure is not limited to a vacuum pump function and having a claim not limited to pumping will be classified in Class 313 or Class 315 if otherwise appropriate; (b) SPACE DISCHARGE WITHOUT GETTERING - Those devices in which a fluid or fluid stream is ionized by a space discharge device and do not include gettering of the ionized fluid will generally be classified in Class 313 or 315 even though the sole disclosure relates to pumping or vacuum formation. However, if in addition to the ionization means an additional pump of the nonionization type is claimed the patent will be classified in Class 417.

SEE OR SEARCH CLASS:
313, Electric Lamp and Discharge Devices, appropriate subclasses and see particularly 231.01, 359.1+ and 545 to 566. See (1) Note above.
315, Electric Lamp and Discharge Devices: Systems, appropriate subclasses and see particularly 111.01 See (1) Note above.

This subclass is indented under subclass 48. Subject matter in which the pumped fluid is electrically conductive, a current being caused to flow in the fluid while being subjected to a magnetic field, the result being a pumping action on the fluid.

SEE OR SEARCH THIS CLASS, SUBCLASS:
49 for the "pumping" of fluid or formation of a vacuum by ionizing the fluid to be pumped and subjecting the ionized fluid to a magnetic field and see the notes thereto for similar art classified elsewhere.

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310, Electrical Generator or Motor Structure, subclass 11 for dynamoelectric apparatus utilizing a conducting fluid.

This subclass is indented under subclass 48. Subject matter provided with getter means and in which means are provided to elevate the temperature of the getter, to change the state of the getter from a solid to a vapor or to renew the getter to perform its gettering function after having already operated as a getter.

This subclass is indented under the class definition. Subject matter in which the fluid to be pumped is isolated in a chamber, heated to expel a portion thereof from the chamber, this expelled portion constituting the pumped fluid, and the fluid remaining in the chamber then cooled so as to contract and establish a reduced pressure in the chamber to draw in a new charge of fluid.

This subclass is indented under the class definition. Processes of pumping.

SEE OR SEARCH CLASS:
166, Wells, 369 for a process of producing a well including a significant manipulative step in addition to pumping.

This subclass is indented under subclass 53. Processes in which one fluid is pumped or motivated by direct contact or entrainment with another fluid, the motive fluid before contact or entrainment being separate from the pump fluid.

This subclass is indented under subclass 54. Processes in which the composition of the motive fluid is specified in a claim.
(1) Note. The following are excluded under this definition as specific motive fluid: water, air, steam, mercury. Oil is also excluded under this definition unless the composition is more specifically recited than mere "oil".

This subclass is indented under the class definition. Apparatus in which the pump has a piston which reciprocates within an elongated cylinder of uniform cross-sectional dimensions which is adapted to be positioned within a drilled well, said piston serving to separate the cylinder into respective motor and pump chambers, means providing either a restricted or a controlled flow path which provides communication between the pump and motor chambers (i.e., between opposite sides of the piston), the induction of at least a portion of the fluid to be pumped flowing serially through the motor chamber, said restricted or controlled flow path, and thence into said pump chamber; motive fluid being subsequently applied to said motor chamber to drive said piston on an eduction stroke.
(1) Note. The motive fluid under this definition may be derived either from the well itself or from an external source.
(2) Note. This subclass and those indented hereunder are intended to include the subcombination of a valved or radially expansible piston for performing a valving function which is disclosed as having utility in the apparatus defined herein.

This subclass is indented under subclass 56. Apparatus in which there is provided means for controlling the flow of liquid from the pump chamber, said flow controlling means being operated in response to either (1) the sensing of a condition or change in condition or (2) the arrival of the piston at a predetermined position in the cylinder.
(1) Note. For purposes of this definition, a mere check valve in the eduction flow conduit which opens in the direction of pump fluid eduction is not considered to be condition responsive control. Also, the mere passing of the eduction port by the free piston is not considered to be position responsive control of the type herein provided for.

This subclass is indented under subclass 56. Apparatus in which there is provided valve means for controlling the inlet of motive fluid to the motor chamber, said valve means comprising mechanical elements which are relatively moved in response to either (1) the sensing of a condition or change in condition or (2) the arrival of the piston at a predetermined position in the cylinder.
(1) Note. For purposes of this definition, a mere check valve positioned within the motive fluid supply line which opens in the direction of motive fluid supply to the motor chamber is not considered to be condition responsive control.
(2) Note. Supply of motive fluid which is controlled by well liquid level in which the well liquid serves to directly cover or uncover motor chamber supply ports is excluded under this definition. However, a piston controlled cylinder port which is subsequently opened to allow the supply additional motive fluid is included hereunder.

This subclass is indented under subclass 56. Apparatus in which at least a portion of the piston is capable of expansion and contraction in a direction perpendicular to its axis of reciprocation to thereby provide a valving action with the chamber in which it reciprocates to allow or interrupt fluid communication between the pump and motor chambers.

SEE OR SEARCH THIS CLASS, SUBCLASS:
555.1 and see the search notes therein, for other fields of search for radially expansible and contractible pistons.

This subclass is indented under subclass 56. Apparatus in which the piston has a fluid flow passage formed therein which extends to opposite ends of said piston and valve means carried by the piston for controlling said passage, said valve means being positively mechanically moved by engagement of said valve (or an element associated therewith) with a stationary chamber portion.

This subclass is indented under the class definition. Apparatus in which the pump unit or the intake or discharge line thereof is buoyant or buoyantly supported so as to be capable of floating on a body of liquid, the pump not being operated by the rise and fall or flow of the liquid on which it or its intake or discharge line floats.

SEE OR SEARCH CLASS:
415, Rotary Kinetic Fluid Motors or Pumps, subclass 7, for a float supported or buoyant runner.

This subclass is indented under the class definition. Apparatus comprising two pumping members or units, and means being provided by which the pumped fluid is successively acted upon by said members or units, and alternatively the members or units are arranged in separate or branched flow lines so as to take from a common or separate sources and deliver to a common or separate outlets.

This subclass is indented under the class definition. Apparatus having (1) signals, indicators, registers, recorders, or gauges for indicating a condition of the pump or pumped fluid or the position of a pump part such as a piston, control member, valve, etc., such devices comprising relatively movable, changeable or audible information giving parts, or (2) transparent viewing means whereby the pump operation or the condition of some part thereof may be observed.
(1) Note. For classification under part (1) of this definition there must be either an indicia or an audible or visual signal or a means whose sole purpose is to indicate a condition of the device. Relative to indicia there must be graduations or markings disclosed. Where it is indicated that the mere position of a pump part is indicative of a condition of the pump (e.g., valve handle position indicated direction of fluid flow) classification under the definition does not result unless some cooperating indicia are included.

This subclass is indented under the class definition. Apparatus having a cellular member rotatable about an axis with means to isolate therein and from its source a volume of gas to be pumped, transfer said volume to a position where a gaseous motive fluid may be admitted into said cellular member for the purpose of increasing the pressure of said volume while an interface is maintained between the two gases, and then permit the pumped gas and the motive gas to be exited from said cellular member each into a separate flow path.

This subclass is indented under the class definition. Apparatus in which one fluid is pumped or motivated by direct contact or entrainment with another fluid, the motive fluid before contact or entrainment being separate from the pump fluid.
(1) Note. This definition does not include mere pulsation dampeners or accumulators, i.e., a trapped, confined compressible fluid which directly receives energy from another fluid and returns the energy to the other fluid from which it was received.

SEE OR SEARCH THIS CLASS, SUBCLASS:
64 for gas pressure exchange devices using a rotary cellular member to transfer a gas to be pumped to a position where its pressure may be increased by being contacted directly by a gaseous motive fluid.

This subclass is indented under subclass 65. Apparatus in which a driven element is provided to continuously and unidirectionally move the motive fluid either as slugs or a complete ring about an axis at a relatively high rate of speed, said motive fluid directly contacting and imparting energy to the fluid being pumped while in said movement about an axis.

This subclass is indented under subclass 66. Apparatus in which the driven element is provided with a passage passing through the axis of rotation of the element at the point where it is supported for rotation and said passage is described as conveying motive fluid or fluid being pumped.

This subclass is indented under subclass 66. Apparatus in which the motive fluid is rotated by the driven member at such a speed and in such a manner as to form a peripheral ring around the driven member within a surrounding casing.

This subclass is indented under subclass 68. Apparatus including a second pump which is of a different basic type from the liquid ring pump.
(1) Note. The liquid ring pump may be merely a priming pump for the second pump.

This subclass is indented under subclass 66. Apparatus in which a passage to supply motive fluid to be rotated by the driven element is provided, said passage being closely related to the axially remote portion of the rotary element.

This subclass is indented under subclass 66. Apparatus in which a passage is provided to bring fluid to be pumped into contact with motive fluid being moved about an axis, said passage being closely related to axis of the driven element.

This subclass is indented under subclass 71. Apparatus in which an outlet passage for pumped fluid is provided, said passage being closely related to the axially remote portion of the rotary element.

This subclass is indented under subclass 65. Apparatus comprising a pumping chamber into which pump fluid is alternately introduced and expelled, the pumping being effected by burning of motive fluid and application of the products of combustion to the chamber.

This subclass is indented under subclass 73. Apparatus having a separate ignition means to ignite the motive fluid, said ignition means being responsive to a condition of the pump fluid.

This subclass is indented under subclass 73. Apparatus including means to return a portion of the pump fluid to the pump chamber and utilize the momentum thereof to effect expulsion of a previously burned charge of motive fluid, and compress the next incoming charge of motive fluid.

This subclass is indented under subclass 65. Apparatus including a jet pump and an additional pump which includes a mechanical impelling member (e.g., piston, rotor, etc.) to generate the motive fluid supplied to the jet pump.
(1) Note. For the definition of a jet pump see this class subclass 151.
(2) Note. The jet pump may have the sole disclosed use of priming the motive fluid generating pump.

This subclass is indented under subclass 76. Apparatus in which the motive fluid and the pumped fluid are of different states (i.e., liquid and gas) and after entrainment the two are separated and the motive fluid fed back to the entrainment area as recirculated motive fluid.
(1) Note. This definition excludes a jet pump which primes the other pump of air but then acts to pump liquid when the other pump is primed.

This subclass is indented under subclass 76. Apparatus provided with a rotary impeller which acts to project motive fluid therefrom, the exit of the impeller acting as the motive fluid nozzle and being disposed in the area of entrainment.
(1) Note. This definition excludes an impeller whose discharge is confined by a passage which acts as the motive fluid nozzle. See subclass 84.

SEE OR SEARCH THIS CLASS, SUBCLASS:
66 for pumping one fluid by contact or entrainment with another wherein the contact or entrainment occurs within a rotary impeller.

This subclass is indented under subclass 76. Apparatus in which at least a portion of the output of the jet pump is supplied back to the intake of the motive fluid generating pump.

This subclass is indented under subclass 79. Apparatus in which the motive fluid generating pump comprises a pumping member which has unidirectional rotary motion about a fixed axis and acts to pump fluid by a centrifugal, centripetal or screw effect.

This subclass is indented under subclass 80. Apparatus in which the rotary nonexpansible chamber-type pump includes a plurality of rotary pumping members at least a portion of the pumped fluid passing successively from one pumping member to the next.

This subclass is indented under subclass 80. Apparatus in which the jet pump may be selectively placed in different positions with respect to the rotary pump, usually for adapting the apparatus to operate with a shallow well with the jet proximate the rotary pumping member or with a deep well with the jet positioned in the well remote from the rotary pumping member.

This subclass is indented under subclass 80. Apparatus in which the jet pump is located in close physical proximity to the rotary pumping member of the diverse pump and is
contained within the housing structure (including inlet and outlet connections) thereof.

SEE OR SEARCH THIS CLASS, SUBCLASS:
82 for combined jet and rotary nonexpansible chamber-type pumps in which the jet may be selectively located in the rotary pump casing or remote therefrom.

This subclass is indented under subclass 76. Apparatus in which the motive fluid generating pump comprises a pumping member which has unidirectional rotary motion about a fixed axis and acts to pump fluid by a centrifugal, centripetal or screw effect.

This subclass is indented under subclass 65. Apparatus comprising a plurality of discrete pumps of different basic types.
(1) Note. This definition does not include a plurality of pumps of different basic types if one is a mere auxiliary or ancillary of the other (e.g., lubricant or cooling pump for main pump). However, a pump whose sole disclosed function may be to prime the other pump is not considered a mere auxiliary and this combination is included in this definition.
(2) Note. This definition includes as different basic-type pumps which may both be of the fluid contact or entrainment types such as, for example, jet pump and aerated column, pneumatic displacement and jet, etc.

SEE OR SEARCH THIS CLASS, SUBCLASS:
69 for diverse pumps one of which is the liquid ring type.

This subclass is indented under subclass 85. Apparatus in which one of the pumps is of the type having a chamber or container in which liquid to be pumped is collected and means
to apply gas pressure from an external source to the surface of the liquid in said chamber or container to expel the liquid therefrom.
(1) Note. The gas pressure may be merely atmospheric air admitted to the chamber which has been filled by applying vacuum thereto.

This subclass is indented under subclass 85. Apparatus in which one of the pumps comprises a jet pump.
(1) Note. For the definition of a jet pump see this class subclass 151.

SEE OR SEARCH THIS CLASS, SUBCLASS:
76 for a jet pump with a motive fluid generating pump.

This subclass is indented under subclass 87. Apparatus in which the diverse pump is driven by an internal combustion engine or fluid motor and the exhaust motive fluid or combustion products from the motor are directed to the fluid jet producing means of the jet pump to act as the motive fluid therefor.

SEE OR SEARCH THIS CLASS, SUBCLASS:
91 for an aerated column pump and a diverse pump which is driven by an internal combustion engine or fluid motor the exhaust of which provides the aeration fluid.

This subclass is indented under subclass 87. Apparatus in which another of the pumps comprises a pumping member which has unidirectional rotary motion about a fixed axis and acts to pump fluid by centrifugal, centripetal or screw effect.

SEE OR SEARCH THIS CLASS, SUBCLASS:
80 for a jet pump with a rotary nonexpansible chamber-type
pump which generates the motive fluid for the jet.

This subclass is indented under subclass 85. Apparatus in which one of the pumps is of the aerated column type.
(1) Note. For the definition of an aerated column pump see this class subclass 108.

This subclass is indented under subclass 90. Apparatus in which the diverse pump is driven by an internal combustion engine or fluid motor, the exhaust motive fluid or combustion products from the motor constituting the gas which is injected into the liquid column.

SEE OR SEARCH THIS CLASS, SUBCLASS:
88 for a jet pump in which the jet motive fluid is the exhaust from an internal combustion engine or fluid motor which drives a pump different from the jet pump.

This subclass is indented under subclass 65. Apparatus in which a fluid may be pumped by the direct action thereon of a compressing chamber or container and a liquid forming part of said compressing chamber or container, the body of liquid in effect constituting a piston in said container whereby relative movement between said liquid and said container varies the volume of a space in said chamber or container to pump the fluid.

This subclass is indented under subclass 92. Apparatus in which at least one wall of said chamber means is moved relative to a surface of said body of liquid to change the volume of said chamber and thus pressurize the fluid confined
therein.

This subclass is indented under subclass 93. Apparatus in which said chamber has a wall means having a spiral configuration which extends along an axis, and upon rotation about said axis said wall means is caused to move relative to said liquid surface, move said fluid axially and change the pressure of said fluid to be pumped which is confined in said chamber.

This subclass is indented under subclass 93. Apparatus in which the movement of the chamber operates a cyclically operated valve or other cyclic control means for flow of the body of liquid to or from the chamber.

This subclass is indented under subclass 93. Apparatus in which the body of liquid is completely supported by the structure which forms the chamber, said structure being moved to cause said fluid to be pumped.

This subclass is indented under subclass 93. Apparatus in which a plurality of chamber means are provided, said chambers being moved relative to one another.

This subclass is indented under subclass 93. Apparatus in which the chamber means is moved to-and-fro.

This subclass is indented under subclass 92. Apparatus in which the liquid body comprises the element mercury.

This subclass is indented under subclass 92. Apparatus in which the body of liquid is moved by the natural tide or wave action of a large body of water in its natural situation.

This subclass is indented under subclass 92. Apparatus in which relative height of the surface of the body of liquid in said chamber cyclically operates a valve or other control means to effect cyclic pumping.

This subclass is indented under subclass 101. Apparatus in which a plurality of interrelated variable volume compressing chambers are provided.

This subclass is indented under subclass 92. Apparatus in which a plurality of contracting chambers are provided.

This subclass is indented under subclass 92. Apparatus in which the body of liquid is set in motion and the inertia of
the body of liquid (i.e., the tendency to remain in motion or at rest) being effective to produce the pumping action.

This subclass is indented under subclass 65. Apparatus in which gaseous pumping fluid is reduced to the liquid state with a resultant pressure change, which change causes the pumped fluid to be motivated.

This subclass is indented under subclass 105. Apparatus comprising plural pumping chambers which are so interrelated as to produce alternate or successive pumping from the chambers.

This subclass is indented under subclass 105. Apparatus with means responsive to a condition of the pumping or pumped fluid, said means controlling the flow of the pumping or pumped fluid.

This subclass is indented under subclass 65. Apparatus comprising a vertical column into which the liquid to be pumped enters, with means to inject a gaseous motive fluid below the level of the liquid accumulated therein which effects a mixed mass of reduced specific gravity to elevate said liquid with said gas.

SEE OR SEARCH THIS CLASS, SUBCLASS:
85 for means for pumping a fluid which employs a means to aerate the fluid to reduce its specific gravity in combination with another kind of pump means (e.g., jet, etc.).
151 for jet pumps which employ a motive fluid moving at a
greater velocity than the fluid to be pumped thereby creating a vacuum or reduced pressure area to motivate the pumped fluid and wherein the motive fluid may subsequently become entrained with the pumped fluid.

This subclass is indented under subclass 108. Apparatus wherein said injection means comprises valve means which opens and closes to control the gaseous motive fluid injected.

This subclass is indented under subclass 109. Apparatus having (1) fluid impinging means in the flow path of the liquid to be pumped, to be acted upon thereby, or (2), means responsive to the velocity of the moving liquid being pumped comprising a restricted passageway.

This subclass is indented under subclass 109. Apparatus wherein said valve means comprises plural valves mounted at vertically spaced levels along said vertical column, and having common mechanical or electrical actuating means to actuate or permit the actuation of the valves in a particular sequence.

This subclass is indented under subclass 109. Apparatus wherein said valve means is actuated by an associated flexible diaphragm or bellows-type sensing element which is responsive to the pressure of either the liquid to be pumped, or the gaseous pumping fluid.

This subclass is indented under subclass 112. Apparatus wherein said valve means comprises a pilot valve and a main valve, said pilot valve controlling actuating fluid to the main valve to control actuation thereof, and said sensing element controlling the actuation of said pilot valve.

This subclass is indented under subclass 109. Apparatus wherein said valve means comprises a pilot valve and a main valve, said main valve controlling the gaseous motive fluid injection and said pilot valve controlling actuating fluid to the main valve to control actuation thereof.

This subclass is indented under subclass 109. Apparatus wherein said valve means is actuated in response to the attainment of an absolute rate of flow, pressure or other absolute condition of the motive fluid to control the flow of motive fluid injected into the pumped fluid.

SEE OR SEARCH THIS CLASS, SUBCLASS:
109 for devices having unbiased check valves in the gaseous motive fluid line which merely acts to prevent the flow of the liquid to be pumped back into the motive fluid line and which, by their nature, permit flow of motive fluid to flow therethrough whenever the pressure of the motive fluid exceeds that of the pumped fluid.
110 for those devices having motive fluid injection control valves which are controlled in response to the flow of the pumped fluid and which may also be influenced by a motive fluid condition.
117 for those devices having motive fluid injection control valves which are actuated to permit the flow of motive fluid into the pumped fluid in response to a static head build up of pumped fluid.

This subclass is indented under subclass 109. Apparatus comprising float means or other nonpressure sensitive means responsive to the level of liquid accumulated, which float means controls actuation of said valve means.

This subclass is indented under subclass 109. Apparatus wherein said valve means comprises a valve member, said valve member being biased closed by weight, spring, or other means, and having means exposed to the accumulation of liquid within said vertical column, which means, in response to the pressure of the accumulated liquid, opens or tends to open said valve member.

This subclass is indented under subclass 65. Apparatus in which the fluid which is to be pumped is a liquid, and the motive fluid is a gas, comprising a pumping chamber, a liquid inlet and a liquid outlet through which the liquid is pumped into and out of said chamber, means for supplying and exhausting the gas to effect the pumping of said liquid, and further having (1) pump means to supply or exhaust the gas or (2), liquid level float means to effect control of the gas or liquid entering or leaving said chamber or (3) means to effect repetitive or cyclic pumping into and from said chamber upon initiation of the pumping action.
(1) Note. The pumps disclosed in the patents contained herein operate on a differential pressure principle, i.e., by withdrawing the gaseous motive fluid which is in contact with a portion of a confined liquid to be pumped, a higher pressure, e.g., atmospheric, acting upon another portion of said confined liquid effects movement and thus pumping thereof.
(2) Note. Devices are included under this definition wherein the pumping chamber is provided with a single means by which both the liquid and the gas are exhausted.
(3) Note. Devices are classified under this definition which have pumping chambers which are submerged in the liquid to be pumped whereby the liquid is introduced into the chamber by gravity.

This subclass is indented under subclass 118. Apparatus having a pump means to supply or exhaust the gas, said pump means comprising means to utilize a body of liquid, which body of liquid is in contact with the gas, to compress or expand said gas.

This subclass is indented under subclass 118. Apparatus having pump means for said motive fluid, and including condition responsive control means to directly control said pump means.

This subclass is indented under subclass 118. Apparatus comprising plural pumping chambers where the liquid output of one chamber is the liquid input for another.

This subclass is indented under subclass 118. Apparatus comprising plural pumping chambers interrelated by means to effect alternate pumping from said chambers.

This subclass is indented under subclass 122. Apparatus wherein said interrelated means is responsive to a condition of the motive fluid or the fluid which is pumped in a first chamber, to control the supplying or exhausting of motive fluid to a second chamber.

This subclass is indented under subclass 123. Apparatus wherein the condition is the weight of the fluid which is pumped which has accumulated in the first chamber.

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140 for devices having a movably mounted means adapted to receive the fluid which is pumped and adapted to be moved in response to a quantity of fluid received to control the pumping operation.

This subclass is indented under subclass 123. Apparatus wherein the condition is the liquid level of the fluid which is pumped in the first chamber.

This subclass is indented under subclass 118. Apparatus having means buoyed by the fluid which is pumped and responsive to change in level thereof to control flow of the fluid which is pumped or of the motive fluid into or from the pumping chamber.

This subclass is indented under subclass 126. Apparatus having more than one buoyant means in a single pumping chamber.

This subclass is indented under subclass 126. Apparatus wherein the flow of the fluid which is pumped or the flow of the motive fluid is controlled by a valve means which is controlled by the buoyed means through a pilot valve means.

This subclass is indented under subclass 126. Apparatus wherein the flow to or from the pumping chamber of the motive fluid or of the fluid which is pumped is controlled by said buoyed means through an electrical actuating means.

This subclass is indented under subclass 126. Apparatus wherein the admission of the motive fluid to the pumping chamber is controlled by the buoyed means.
(1) Note. Apparatus having means to control the admission of atmospheric air to a pumping chamber adapted to be placed under a vacuum are classified in this and indented subclasses.

This subclass is indented under subclass 130. Apparatus wherein said buoyed means also controls the exhausting of the motive fluid from the pumping chamber.
(1) Note. Apparatus having means to control the flow of working fluid from the pumping chamber to a vacuum source are cl