ClassID:

143134

F04B49/12 - CPC Classification

Classification description:

Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups  -  by varying the length of stroke of the working members

Sub-classes:
Recent Application in this class:
#1
20260146598
2026-05-28

VARIABLE DISPLACEMENT PUMP

#2
20260078751
2026-03-19

GAS COMPRESSOR AND SYSTEM AND METHOD FOR GAS COMPRESSING

#3
20260015997
2026-01-15

ROTARY SWASH PLATE HYDRAULIC PUMP

#4
20260002525
2026-01-01

ROTARY SWASH PLATE HYDRAULIC PUMP

#5
20250389260
2025-12-25

PWM CONTROL OF ACTUATION PRESSURE FOR VARIABLE-DISPLACEMENT HYDRAULIC PUMPS

#6
20250361862
2025-11-27

Swivel Angle Measuring Device on a Hydrostatic Axial Piston Machine with Variable Stroke Volume

#7
20250334112
2025-10-30

CALIBRATABLE VARIABLE DISPLACEMENT PUMP

#8
20250314247
2025-10-09

CALIBRATABLE VARIABLE DISPLACEMENT PUMP

#9
20250290494
2025-09-18

OSCILLATING METERING PUMP

#10
20250270961
2025-08-28

DIRECT CONTROL VARIABLE DISPLACEMENT PUMP WITH DUAL-FUNCTION HIGH-PRESSURE RELIEF VALVE-PRESSURE REGULATING VALVE

#11
20250223958
2025-07-10

APPARATUSES, SYSTEMS, AND METHODS FOR ADJUSTING THE EFFECTIVE STROKE-LENGTH OF A POSITIVE DISPLACEMENT PUMP

#12
20250207570
2025-06-26

ROTARY SWASH PLATE HYDRAULIC PUMP

#13
20250188913
2025-06-12

ROTARY SWASH PLATE HYDRAULIC PUMP

#14
20250179999
2025-06-05

VARIABLE DISPLACEMENT HYDRAULIC PUMP SYSTEM WITH OVER-TEMPERATURE PREVENTION

#15
20250163902
2025-05-22

VARIABLE DIAMETER VALVE BORES FOR THRU ROD FLUID ENDS

#16
20240418161
2024-12-19

GAS COMPRESSOR AND SYSTEM AND METHOD FOR GAS COMPRESSING

#17
20240410358
2024-12-12

DIRECT CONTROLLED VARIABLE DISPLACEMENT PUMP FUEL SYSTEMS WITH LOW PRESSURE THERMAL RECIRCULATION PUMPING

#18
20240410348
2024-12-12

Pump-Based Fluid Flow Meter

#19
20240352928
2024-10-24

Metering positive displacement pump stroke length limiter

#20
20240309609
2024-09-19

ENERGY STORAGE DEVICE AND WORK MACHINE

#21
20240141885
2024-05-02

Hydraulic pump performance deterioration detection system

#22
20230383742
2023-11-30

PUMP COMPRISING COOLING MEANS

#23
20230366393
2023-11-16

Bent axis plunger-type variable hydraulic motor pump

#24
20230355861
2023-11-09

NEGATIVE PRESSURE WOUND THERAPY APPARATUS AND METHODS

#25
20230220845
2023-07-13

Pump system, use of a pneumatic resistance and medical device or gas-measuring device

#26
20230207842
2023-06-29

FUEL CELL FLUID MACHINE

#27
20230204029
2023-06-29

Variable displacement piston pump with electronic control unit to provide direct metering control

#28
20230193886
2023-06-22

HYDRAULIC PUMP

#29
20230130997
2023-04-27

Variable displacement pumps

#30
20230105578
2023-04-06

Variable positive displacement pump actuator systems

#31
20230058600
2023-02-23

CALIBRATABLE VARIABLE DISPLACEMENT PUMP

#32
20230052785
2023-02-16

Axial piston pump controller

#33
20220268273
2022-08-25

Gas compressor and system and method for gas compressing

#34
20220268272
2022-08-25

Variable displacement hydraulic pump system with over-temperature prevention

#35
20220243720
2022-08-04

Air cylinder

#36
20220243709
2022-08-04

Metering pump with temporary reversal of direction of the displacement element

#37
20220205440
2022-06-30

Liquid feed pump and liquid chromatography device

#38
20220178461
2022-06-09

Capacity control valve

#39
20220154715
2022-05-19

Pump displacement control device having a feedback lever

#40
20220082104
2022-03-17

Hydraulic fan drive

#41
20220074396
2022-03-10

Hydrostatic axial piston machine of swash plate construction

#42
20220049687
2022-02-17

Pump having a pressure sensor to displace a known volume of fluid from a reservoir, which stretches and contracts

#43
20210388705
2021-12-16

Decoupled long stroke pump

#44
20210387848
2021-12-16

Metering pumps for fueling applications

#45
20210372388
2021-12-02

Internally cooled inline drive compressor

#46
20210340972
2021-11-04

HYDRAULIC PUMPING SYSTEM WITH PISTON DISPLACEMENT SENSING AND CONTROL

#47
20210317827
2021-10-14

Control arrangement for variable displacement pump

#48
20210317825
2021-10-14

Gas compressor and system and method for gas compressing

#49
20210301502
2021-09-30

Construction machine

#50
20210277888
2021-09-09

Pump for the Application of Fluids

#51
20210270257
2021-09-02

Multi-phase fluid pump system

#52
20210254615
2021-08-19

Variable flow rate mechanical pump assembly

#53
20210164501
2021-06-03

Hydraulic axial piston unit and method for controlling of a hydraulic axial piston unit

#54
20210164458
2021-06-03

PUMP DRIVE THAT MINIMIZES A PULSE WIDTH BASED ON VOLTAGE DATA TO IMPROVE INTAKE AND DISCHARGE STROKES

#55
20210162834
2021-06-03

Methods and systems for cooling

#56
20210131413
2021-05-06

Capacity control valve

#57
20210123423
2021-04-29

Capacity control valve

#58
20210115910
2021-04-22

Torque control system for a variable displacement pump

#59
20210108844
2021-04-15

Compressor driving apparatus and refrigerator including the same

#60
20210071653
2021-03-11

Linear compressor and linear compressor control system

#61
20210048018
2021-02-18

Capacity control valve having a solenoid and a second plunger between the solenoid and a valve body

#62
20210048017
2021-02-18

Capacity control valve having an auxiliary communication part allowing communication with an intermediate passage

#63
20210025375
2021-01-28

Non-pulsating pump and method of controlling the same

#64
20200368407
2020-11-26

Status indication for negative pressure wound therapy

#65
20200362848
2020-11-19

Borehole pump and method of using the same

#66
20200360601
2020-11-19

Rotational metering pump for insulin patch

#67
20200332781
2020-10-22

Hydraulic pressure amplifier

#68
20200248682
2020-08-06

Pumping Systems

#69
20200240406
2020-07-30

Linear compressor and method for controlling linear compressor

#70
20200172385
2020-06-04

Apparatus for filling cartridges of e-vapor devices

#71
20200132069
2020-04-30

Hydrostatic piston machine

#72
20200124040
2020-04-23

Gas compressor and system and method for gas compressing

#73
20200121833
2020-04-23

Systems and methods of calibrating operating parameters of negative pressure wound therapy apparatuses

#74
20200056580
2020-02-20

Manual displacement control arrangement for an axial piston pump

#75
20200025193
2020-01-23

Method for operating a hydraulic consumer on an electrically actuated control valve

#76
20200003206
2020-01-02

Hydrostatic Axial Piston Pump for a Hydrostatic Traction Drive

#77
20200003202
2020-01-02

Method and system for metering fluid flow from a fluid source based on a count of pump strokes

#78
20190383284
2019-12-19

Linear compressor and method for controlling linear compressor

#79
20190353150
2019-11-21

Hydraulic pump with swash plate tilt control

#80
20190345694
2019-11-14

Hydraulic control arrangement for an arrangement of mobile machines, and arrangement of mobile machines

#81
20190344010
2019-11-14

Rotational metering pump for insulin patch

#82
20190331105
2019-10-31

SWASH PLATE COMPRESSOR

#83
20190316577
2019-10-17

Linear compressor and methods of extension control

#84
20190316575
2019-10-17

Variable displacement refrigerant compressor having a control valve adapted to adjust an opening degree of a pressure supply passage and a switching valve in the pressure supply passage closer to a controlled pressure chamber than the control valve and switching between a first state and a second state

#85
20190301445
2019-10-03

Pump device

#86
20190234395
2019-08-01

Borehole pump and method of using the same

#87
20190226467
2019-07-25

Variable-capacity compressor control valve

#88
20190154168
2019-05-23

Variable-capacity compressor control valve

#89
20190145390
2019-05-16

Hydraulic pump with speed and pressure compensation

#90
20190085841
2019-03-21

In-vehicle compression device

#91
20190078565
2019-03-14

Pump drive that minimizes a pulse width based on voltage data to improve intake and discharge strokes

#92
20190078562
2019-03-14

Displacement control valve

#93
20190063424
2019-02-28

Method for detecting head crashing in a linear compressor

#94
20190048869
2019-02-14

FLUID-WORKING MACHINE AND OPERATING METHOD

#95
20190032652
2019-01-31

Gas compressor and system and method for gas compressing

#96
20180369463
2018-12-27

Breast pump

#97
20180335028
2018-11-22

Positive displacement pump with pressure compensating calibration

#98
20180318476
2018-11-08

Noise reduction for negative pressure wound therapy apparatuses

#99
20180298896
2018-10-18

Diaphragm compressor system and method

#100
20180291888
2018-10-11

Control valve for variable displacement compressor

#101
20180258744
2018-09-13

Systems and methods for operating a linear motor to prevent impacts with hard stops

#102
20180258613
2018-09-13

Hybrid work machine

#103
20180230984
2018-08-16

Internally cooled inline drive compressor

#104
20180216861
2018-08-02

Refrigerator control method and system using linear compressor

#105
20180179042
2018-06-28

Apparatus for filling cartridges of e-vapor devices

#106
20180133378
2018-05-17

Dressing status detection for negative pressure wound therapy

#107
20180128225
2018-05-10

Fuel supply device and fuel supply method

#108
20180094628
2018-04-05

Apparatus for feeding gas mixtures at the intake of a high pressure compressor

#109
20180087497
2018-03-29

Mechanism for coarse and fine adjustment of flows in fixed displacement pump

#110
20180073497
2018-03-15

Gas compressor and system and method for gas compressing

#111
20180051691
2018-02-22

AIR SUPPLY DEVICE

#112
20180045196
2018-02-15

Valve for fluid working machine, fluid working machine and method of operation

#113
20180045185
2018-02-15

Torque control system for a variable displacement pump

#114
20180038365
2018-02-08

Gas compressor and system and method for gas compressing

#115
20180030978
2018-02-01

Gas compressor and system and method for gas compressing

#116
20180023557
2018-01-25

Operating method and actuation device for a piston pump

#117
20180016881
2018-01-18

Systems and methods for operating a linear motor to prevent impacts with hard stops

#118
20170368239
2017-12-28

Pressure sampling systems and methods for negative pressure wound therapy

#119
20170356435
2017-12-14

SYSTEM, METHOD, AND APPARATUS FOR UTILIZING A PUMPING CASSETTE

#120
20170298928
2017-10-19

FLUID-WORKING MACHINE AND OPERATING METHOD

#121
20170298923
2017-10-19

Digitized automatic control method for oil-pumping and digitized balance-shifting pumpjack

#122
20170218943
2017-08-03

CONTROLLER FOR PUMP SYSTEM

#123
20170184093
2017-06-29

Pump system, use of a pneumatic resistance and medical device or gas-measuring device

#124
20170184092
2017-06-29

INTEGRATED DISPLACEMENT CONTROLLED PUMP

#125
20170184091
2017-06-29

Rotational metering pump for insulin patch

#126
20170146007
2017-05-25

OPERATIONAL CONTROL OF WELLSITE PUMPING UNIT WITH DISPLACEMENT DETERMINATION

#127
20170146006
2017-05-25

OPERATIONAL CONTROL OF WELLSITE PUMPING UNIT WITH CONTINUOUS POSITION SENSING

#128
20170145659
2017-05-25

Work vehicle having a work implement

#129
20170122309
2017-05-04

Method for operating a linear compressor

#130
20170122307
2017-05-04

Linear compressor and method for controlling a linear compressor

#131
20170122306
2017-05-04

Compressor and method for controlling a compressor

#132
20170089328
2017-03-30

Fluid pressure producing method and fluid pressure producing device

#133
20170074080
2017-03-16

Subterranean pump with pump cleaning mode

#134
20170037841
2017-02-09

Hydraulic pumping system with enhanced piston rod sealing

#135
20170037839
2017-02-09

PUMP ACTUATOR AND METHOD FOR PUMP OPERATION

#136
20170037714
2017-02-09

Hydraulic pumping system with piston displacement sensing and control

#137
20160363117
2016-12-15

Electronic torque and pressure control for load sensing pumps

#138
20160324388
2016-11-10

Variable flow rate mechanical pump assembly

#139
20160319813
2016-11-03

Two piece pump rod

#140
20160281705
2016-09-29

PISTON COMPRESSOR AND METHOD FOR COMPRESSING A CRYOGENIC GASEOUS MEDIUM, IN PARTICULAR HYDROGEN

#141
20160252089
2016-09-01

Electric motor driven pump

#142
20160245275
2016-08-25

Mechanism for fine adjustment of flows in fixed displacement pump

#143
20160245266
2016-08-25

Piston shifting control system

#144
20160230755
2016-08-11

System and method of determining top-dead-center (TDC) of reciprocating compressor

#145
20160221562
2016-08-04

Electrically-driven pressure regulator and volume-delivery unit

#146
20160177942
2016-06-23

Pump operation procedure with piston position sensor

#147
20160177941
2016-06-23

Methods and system for enhancing flow of a fluid induced by a rod pumping unit

#148
20160177940
2016-06-23

Method and systems for enhancing flow of a fluid induced by a rod pumping unit

#149
20160169222
2016-06-16

Fluid-working machine and operating method

#150
20160169219
2016-06-16

Pumps, pump assemblies, and methods of pumping fluids

#151
20160153442
2016-06-02

Apparatus and method for controlling a linear compressor and a linear compressor and a refrigerator having the same

#152
20160131130
2016-05-12

Power unit of hydraulic pumping unit and corresponding hydraulic pumping unit

#153
20160116053
2016-04-28

Pressure and flow compensated hydraulic system

#154
20160097386
2016-04-07

Displacement pump

#155
20160053879
2016-02-25

PUMP CONTROL METHOD AND SYSTEM

#156
20160023339
2016-01-28

High pressure water pump

#157
20150377229
2015-12-31

PUMP ASSEMBLY FOR PUMPING A FLUID LUBRICANT

#158
20150377223
2015-12-31

Hydraulic swash block positioning system

#159
20150377098
2015-12-31

Control device for oil pump

#160
20150359956
2015-12-17

Fluid pumping apparatus for use with a removable fluid pumping cartridge

#161
20150337830
2015-11-26

Rotatable component overspeed protection method

#162
20150322755
2015-11-12

Subterranean pump with pump cleaning mode

#163
20150292307
2015-10-15

Synchronized pump down control for a dual well unit with regenerative assist

#164
20150290794
2015-10-15

Pneumatic exomuscle system and method

#165
20150285238
2015-10-08

Diaphragm compressor system and method

#166
20150275890
2015-10-01

SYSTEM AND METHOD FOR CONTROLLING AN INTEGRATED PUMP AND ENERGY RECOVERY SYSTEM

#167
20150240799
2015-08-27

Method and apparatus for pumping fluid

#168
20150219091
2015-08-06

Method of generating a gradient flow having a constant compositional noise characteristic

#169
20150219082
2015-08-06

Variable displacement type swash plate compressor

#170
20150219081
2015-08-06

Electronically controlled linear pump drive

#171
20150147191
2015-05-28

Pump control system and method

#172
20150052889
2015-02-26

Hydrostatic power unit

#173
20150050165
2015-02-19

Control unit for hydraulic variable displacement pumps and variable displacement pump with a control unit

#174
20140328700
2014-11-06

Swash plate pump having control pins in series

#175
20140276428
2014-09-18

System, method, and apparatus for utilizing a pumping cassette

#176
20140260556
2014-09-18

System, method, and apparatus for utilizing a pumping cassette

#177
20140260551
2014-09-18

System, method, and apparatus for utilizing a pumping cassette

#178
20140241905
2014-08-28

Positive displacement pump with pressure compensating calibration

#179
20140219819
2014-08-07

Reciprocating positive displacement pump with electric reversing motor

#180
20140205471
2014-07-24

DETERMINING TOP-DEAD-CENTER (TDC) OF RECIPROCATING COMPRESSOR

#181
20140169987
2014-06-19

Dielectric Sensor Arrangement and Method for Swashplate Angular Position Detection

#182
20140154104
2014-06-05

Hydrostatic positive displacement machine

#183
20130343936
2013-12-26

Pump chamber configured to contain a residual fluid volume for inhibiting the pumping of a gas

#184
20130330209
2013-12-12

Gradient systems and methods

#185
20130318957
2013-12-05

Fluid control system for work vehicle

#186
20130251540
2013-09-26

Method and control device for variable rotational speed control of a displacement pump unit and displacement pump arrangement

#187
20130243611
2013-09-19

Hydraulically driven cooling fan responsive to engine load

#188
20130216402
2013-08-22

Water pump having two operating conditions

#189
20130209284
2013-08-15

Hydraulic dual axial piston machine

#190
20130174925
2013-07-11

NEUTRAL SETTING DEVICE FOR AN ADJUSTABLE HYDRAULIC MACHINE

#191
20130174723
2013-07-11

Neutral setting apparatus of an adjustable hydraulic machine

#192
20130156620
2013-06-20

Fuel injection pump including a variable pressure compartment

#193
20130145890
2013-06-13

Hydraulic apparatus return to neutral mechanism

#194
20130142672
2013-06-06

Method for synchronizing linear pump system

#195
20130034456
2013-02-07

REFRIGERANT COMPRESSOR HAVING LINEAR DRIVE

#196
20120308409
2012-12-06

Pump based fluid flow meter

#197
20120291622
2012-11-22

Displacement Detection Device for Variable Displacement Compressor, and Variable Displacement Compressor Provided with Same

#198
20120288381
2012-11-15

MODULATING LIQUID PUMP

#199
20120216671
2012-08-30

Piston pump

#200
20120205119
2012-08-16

PUMP CONTROL DEVICE, OIL WELL WITH DEVICE AND METHOD

#201
20120177505
2012-07-12

Variable stroke control structure for high pressure fuel pump

#202
20120076667
2012-03-29

ELECTRIC MOTOR PUMP CONTROL INCORPORATING PUMP ELEMENT POSITION INFORMATION

#203
20120063925
2012-03-15

Metering Pump

#204
20120027626
2012-02-02

Return to neutral mechanism for hydraulic pump

#205
20110318193
2011-12-29

Linear compressor

#206
20110262287
2011-10-27

Hydraulic pump controller for construction machine

#207
20110138799
2011-06-16

Control system for swashplate pump

#208
20110131968
2011-06-09

Method for controlling a pump and motor system

#209
20110123354
2011-05-26

Fluid-working machine and operating method

#210
20110097214
2011-04-28

Pump control device, oil well with device and method

#211
20110058968
2011-03-10

Reciprocating compressor

#212
20100296953
2010-11-25

Pump chamber configured to contain a residual fluid volume for inhibiting the pumping of a gas

#213
20100293938
2010-11-25

Hydraulic fluid pump of a vehicle brake system having a delivery means

#214
20100247338
2010-09-30

High pressure variable displacement piston pump

#215
20100172766
2010-07-08

Variable displacement piston machine with a sensor

#216
20100119383
2010-05-13

Pump unit comprising a main pump and a charge pump with a variable pump capacity

#217
20090202367
2009-08-13

Tube occluder and method for occluding collapsible tubes

#218
20090169398
2009-07-02

Transfer pump for high-pressure gasoline injection

#219
20090097987
2009-04-16

Driving control apparatus and method for linear compressor

#220
20090095545
2009-04-16

Pressure control system and method

#221
20080250921
2008-10-16

Stroke adjustment mechanism for reciprocating pumps

#222
20080199333
2008-08-21

Compressor Unit

#223
20070295201
2007-12-27

Control of Reciprocating Linear Machines

#224
20060039795
2006-02-23

Fluid-working machine and operating method

#225
20060008361
2006-01-12

Variable stroke/clearance mechanism

#226
20050229608
2005-10-20

Temperature control for free-piston cryocooler with gas bearings

#227
20050100447
2005-05-12

Flow control system for a gas turbine engine

#228
20050069425
2005-03-31

Tube occluder for occluding collapsible tubes

#229
20050025636
2005-02-03

Pump system for conveying lubricating oil

#230
20050013708
2005-01-20

Systems and methods for providing a dynamically adjustable reciprocating fluid dispenser

#231
18589583
2025-08-26

Direct control variable displacement pump with dual-function high-pressure relief valve- pressure regulating valve

#232
17468342
2026-01-20

Method for autonomous control of oil and gas well down-hole pump surface unit and reduction of gas interference