ClassID:

142832

F04B25/00 - CPC Classification

Classification description:

Multi-stage pumps

Sub-classes:
Recent Application in this class:
#1
20250237219
2025-07-24

SYSTEMS AND METHODS FOR IMPROVING THE PERFORMANCE OF A GAS-DRIVEN GENERATOR USING A PHASE CHANGE REFRIGERANT

#2
20250178912
2025-06-05

MULTI-COMPRESSION UNIT FOR AMMONIA PRODUCTION

#3
20250035097
2025-01-30

Multi-Stage Compressor

#4
20240295214
2024-09-05

METHOD FOR HEAT RECOVERY IN A COMPRESSOR AND A COMPRESSOR

#5
20240240629
2024-07-18

DYNAMIC COMPRESSOR CONTROLS

#6
20240125311
2024-04-18

Fluid transfer and depressurization system

#7
20230366389
2023-11-16

METHOD AND A DEVICE FOR CHANGING THE COMPRESSION RATIO OF A RECIPROCATING COMPRESSOR

#8
20230272790
2023-08-31

OIL FREE THREE-STAGE RECIPROCATING COMPRESSOR AND CO2 SYSTEM COMPRISING SUCH A COMPRESSOR

#9
20230265840
2023-08-24

Multi-Stage Compressor

#10
20230106998
2023-04-06

FILTER UNIT FOR A COMPRESSOR

#11
20230062150
2023-03-02

SYSTEMS AND METHODS FOR VENTILATING A FUEL CELL ENCLOSURE

#12
20220397108
2022-12-15

Cryopump, cryopump system, and method for starting operation of cryopump

#13
20220389921
2022-12-08

Cryopump

#14
20220341412
2022-10-27

Compressed air generation plant

#15
20220333603
2022-10-20

Gas-driven generator system comprising an elongate gravitational distribution conduit coupled with a gas injection system

#16
20220316483
2022-10-06

Systems and methods for improving the performance of air-driven generators using solar thermal heating

#17
20220290691
2022-09-15

Process and apparatus for compressing hydrogen gas in a centrifugal compressor

#18
20220268268
2022-08-25

Electroactive polymer actuator for multi-stage pump

#19
20220252072
2022-08-11

Liquefied gas unloading and deep evacuation system

#20
20220074397
2022-03-10

PUMPING DEVICE, PLANT AND METHOD FOR SUPPLYING LIQUID HYDROGEN

#21
20220003225
2022-01-06

FAST INFLATING AIR PUMP

#22
20210404455
2021-12-30

Multi-stage compressor

#23
20210355924
2021-11-18

Fluid transfer and depressurization system

#24
20210340906
2021-11-04

GASEOUS FLUID COMPRESSION WITH ALTERNATING REFRIGERATION AND MECHANICAL COMPRESSION

#25
20210301812
2021-09-30

Control method of compressor and refrigerant circulation system

#26
20210172428
2021-06-10

Compressor comprising a first drive part, a second drive part, and a high-pressure part configured to move in a coupled manner by a piston rod arrangement wherein a first control unit and a second control unit are configured to control a drive fluid to the first and second drive parts

#27
20210017978
2021-01-21

Dynamic compressor controls

#28
20200408203
2020-12-31

Diaphragm compressor, cooling unit, projector, recording apparatus, and three-dimensional modeled object manufacturing apparatus

#29
20200378380
2020-12-03

Fluid control device

#30
20200240405
2020-07-30

System and method for evacuating a process space

#31
20200209219
2020-07-02

SIMULATED RESPIRATORY TRACT

#32
20200191131
2020-06-18

Flexible supply gas routing for gas compressors

#33
20200124042
2020-04-23

Method for operating a pressure control system comprising a multi-stage compressor, and pressure control system

#34
20200062052
2020-02-27

Wheel-mounted air compression apparatus

#35
20190390668
2019-12-26

Two-stage high-pressure pump with high sealing performance

#36
20190383277
2019-12-19

Multi-stage displacement pump

#37
20190376862
2019-12-12

Compression device

#38
20190363381
2019-11-28

Device For The Air Supply Of A Fuel Cell, Preferentially Of A Fuel Cell Operated With Hydrogen

#39
20190360522
2019-11-28

Device With A Turbocharger For Charging A Fuel Cell

#40
20190331103
2019-10-31

Gas leak determining method, and multi-stage compressor

#41
20190293092
2019-09-26

High-density powder pump

#42
20190257552
2019-08-22

Gas compression cooling system

#43
20190218968
2019-07-18

Gaseous fluid compression with alternating refrigeration and mechanical compression using a first and second bank of compression coupled with first and second cascading heat pump intercoolers having a higher and a lower temperature section

#44
20190203885
2019-07-04

Tank state-detecting breathing air charger

#45
20190055932
2019-02-21

Thermodynamic boiler with thermal compressor

#46
20190003425
2019-01-03

System for supplying compressed gas to several gas-fed devices

#47
20180202431
2018-07-19

Two-stage reciprocating compressor optimization control system

#48
20180128254
2018-05-10

Economized reciprocating compressor

#49
20180112657
2018-04-26

System and method for controlling moisture within an air compressor assembly

#50
20180106260
2018-04-19

Method and apparatus for compressor system pressurization

#51
20180094628
2018-04-05

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

#52
20180003122
2018-01-04

System and method for a compressor

#53
20170363076
2017-12-21

Modular stacked variable-compression micropump and method of making same

#54
20170089637
2017-03-30

Parallel compression in LNG plants using a positive displacement compressor

#55
20170074259
2017-03-16

Compressor piston shape to reduce clearance volume

#56
20170058879
2017-03-02

Positive displacement pump

#57
20170030346
2017-02-02

Sealed cavity compressor to reduce contaminant induction

#58
20170023181
2017-01-26

HYDROGEN COMPRESSOR AND HYDROGEN FILLING SYSTEM

#59
20160377229
2016-12-29

Pressure vessel

#60
20160265524
2016-09-15

High-pressure air pump

#61
20160222951
2016-08-04

Pump having inlet reservoir with vapor-layer standpipe

#62
20160185473
2016-06-30

Packaging machine with a fluid pump assembly

#63
20160169223
2016-06-16

Linear displacement pump with position sensing and related systems and methods

#64
20150369235
2015-12-24

Air supply system with electronic converter

#65
20150354553
2015-12-10

Compression device having connection unit for cooling unit

#66
20150322997
2015-11-12

Connecting rod for an air compressor

#67
20150322933
2015-11-12

Radially configured oil-free compressor

#68
20150211440
2015-07-30

Device for compressing a gaseous fluid

#69
20150139817
2015-05-21

RAMP-UP OPTIMIZING VACUUM SYSTEM

#70
20150078929
2015-03-19

DRAINING DEVICE

#71
20150078927
2015-03-19

Multi-Stage Pump Having Reverse Bypass Circuit

#72
20140377080
2014-12-25

Integrated pump and compressor and method of producing multiphase well fluid downhole and at surface

#73
20140369858
2014-12-18

Device and method for preparing liquified natural gas (LNG) fuel

#74
20140356196
2014-12-04

Natural gas compressor

#75
20140205472
2014-07-24

Dual pump/dual bypass fuel pumping system

#76
20140199192
2014-07-17

Fuel injection pump

#77
20140161633
2014-06-12

Distributed thrusters driven gas compressor

#78
20140127034
2014-05-08

System and method for position control of a mechanical piston in a pump

#79
20140060681
2014-03-06

Hydraulic pressure supply system of automatic transmission

#80
20140017062
2014-01-16

Vacuum pump with longitudinal and annular seals

#81
20130323102
2013-12-05

Gaseous fluid compression device

#82
20130294938
2013-11-07

System and method for a compressor

#83
20130294935
2013-11-07

System and method for a compressor

#84
20130294934
2013-11-07

System and method for a compressor

#85
20130259712
2013-10-03

VACUUM EVACUATION APPARATUS

#86
20130209297
2013-08-15

Pumping device

#87
20130149173
2013-06-13

Multistage compressors for pet bottle blowing processes

#88
20130129531
2013-05-23

Multistage compressor installation

#89
20130121862
2013-05-16

Alternative methods to generate high pressure by iteration in a high-pressure multichamber

#90
20130058800
2013-03-07

Parallel dynamic compressor arrangement and methods related thereto

#91
20120152248
2012-06-21

APPARATUS FOR COMPRESSING AND STORING OXYGEN ENRICHED GAS

#92
20120070313
2012-03-22

System and method for position control of a mechanical piston in a pump

#93
20110303175
2011-12-15

Multi Stage Hydrogen Compression & Delivery System for Internal Combustion Engines Utilizing Working Fluid and Waste Heat Recovery (HCDS-IC_m-wf-wh)

#94
20110302932
2011-12-15

Multi Stage Hydrogen Compression & Delivery System for Internal Combustion Engines Utilizing Working Fluid

#95
20110164990
2011-07-07

Multi-stage compressor

#96
20110123377
2011-05-26

PISTON COMPRESSOR WITH NO-LOAD OPERATION VALVE

#97
20110103976
2011-05-05

Device and method for preparing liquefied natural gas (LNG) fuel

#98
20110014067
2011-01-20

Method and device for supplying a compressor in an internal combustion engine with compressed air

#99
20100329895
2010-12-30

Multistage compressor installation

#100
20100272585
2010-10-28

Radial cam-driven compressor and radial cam-driven compressor assemblies

#101
20100263750
2010-10-21

Multi-stage membrane suction pump

#102
20100236648
2010-09-23

FILLING MACHINE FOR HIGHLY COMPRESSED GAS

#103
20100126691
2010-05-27

Compressor

#104
20100054958
2010-03-04

OIL-FREE AIR COMPRESSOR SYSTEM WITH INLET THROTTLE

#105
20100040989
2010-02-18

Combustor Control

#106
20100013237
2010-01-21

Wind powered energy amplification system and method

#107
20090311114
2009-12-17

MULTI-STAGE PISTON COMPRESSOR

#108
20090304522
2009-12-10

Installation for high pressure compression with several stages

#109
20090297368
2009-12-03

Single Piece Water Over Air Intercooler for a Reciprocating Air Compressor

#110
20090274569
2009-11-05

Piston compressor

#111
20090269212
2009-10-29

High-pressure compressor and its use and method for operating it

#112
20090257896
2009-10-15

ALTERNATIVE METHODS TO GENERATE HIGH PRESSURE BY ITERATION IN A HIGH-PRESSURE MULTICHAMBER

#113
20090223246
2009-09-10

Liquid hydrocarbon slug containing vapor recovery system

#114
20090220364
2009-09-03

Reciprocating-piston compressor having non-contact gap seal

#115
20090220357
2009-09-03

MULTISTAGE COMPRESSOR

#116
20090214361
2009-08-27

OIL-LESS COMPRESSOR WITH SEAL-DUST PROTECTION

#117
20090151794
2009-06-18

Compressor arrangement with bypass means for preventing freezing of the cooling unit

#118
20090047159
2009-02-19

Multi-stage gas compressing apparatus

#119
20090047143
2009-02-19

Method and system for high viscosity pump

#120
20090016908
2009-01-15

Multi-cylinder, dry-running piston compressor a cooling air flow

#121
20090016903
2009-01-15

Precision Pump With Multiple Heads

#122
20080273989
2008-11-06

MULTI-STAGE GAS COMPRESSING APPARATUS

#123
20080245097
2008-10-09

Two stage reciprocating compressor and refrigerator having the same

#124
20080219861
2008-09-11

Cam driven piston compressor

#125
20080213115
2008-09-04

High-pressure gas compressor and method of operating a high-pressure gas compressor

#126
20080127665
2008-06-05

Compressor

#127
20080118373
2008-05-22

Apparatus for compressing and storing oxygen enriched gas

#128
20080101962
2008-05-01

Vacuum pump

#129
20080047611
2008-02-28

Fluid pump having low pressure metering and high pressure delivering

#130
20070234717
2007-10-11

Alternative Methods to Generate High Pressure by Iteration in a High-Pressure Multichamber

#131
20070166173
2007-07-19

Multi-stage, multi-phase unitized linear liquid entrained-phase transfer apparatus

#132
20070128061
2007-06-07

Fixed volume valve system

#133
20070128048
2007-06-07

System and method for position control of a mechanical piston in a pump

#134
20070116579
2007-05-24

Positive-displacement reciprocating compressor

#135
20070065301
2007-03-22

System and method for providing oxygen

#136
20070033966
2007-02-15

Vehicle air conditioning system

#137
20060254307
2006-11-16

Two-stage linear compressor

#138
20060248886
2006-11-09

Isothermal reciprocating machines

#139
20060222515
2006-10-05

Drainage system for compressor separators

#140
20060216158
2006-09-28

Home oxygen-compression apparatus

#141
20060083626
2006-04-20

Compressor and hermetic housing with minimal housing ports

#142
20060000474
2006-01-05

Apparatus for compressing and storing oxygen enriched gas

#143
20050283282
2005-12-22

Method and apparatus for controlling desiccant regeneration in air dryer equipment for a locomotive

#144
20050260080
2005-11-24

Reciprocating compressor

#145
20050210895
2005-09-29

Method and apparatus for reducing inrush current in a multi-stage compressor

#146
20050201880
2005-09-15

Positive-displacement reciprocating compressor

#147
20050201868
2005-09-15

Multi-stage compressor

#148
20050175480
2005-08-11

Yoke mechanism for compressor

#149
20050095488
2005-05-05

Two-stage compression for air supply of a fuel cell system

#150
16129225
2019-10-15

Fluid transfer and depressurization system