Patents-Review.com
ClassID:

142701 ⎘

F04B7/04 - CPC Classification

Classification description:

Piston machines or pumps characterised by having positively-driven valving in which the valving is performed by pistons and cylinders coacting to open and close intake or outlet ports

Sub-classes:
Recent Application in this class:
#1
20250237205
2025-07-24

FLUID COMPRESSION APPARATUS AND METHOD

 #2
20240247647
2024-07-25

COMPACT VOLUMETRIC PUMP

 #3
20240151217
2024-05-09

DEVICE AND METHOD FOR CONTROLLED SUPPLY OF HIGH-PRESSURE FLUID

 #4
20240044328
2024-02-08

MUD PUMP VALVE LEAK DETECTION AND FORECASTING

 #5
20230085780
2023-03-23

Compression apparatus and filling station comprising such an apparatus

 #6
20230071844
2023-03-09

Compression apparatus and filling station comprising such an apparatus

 #7
20210388831
2021-12-16

Mud pump valve leak detection and forecasting

 #8
20210033079
2021-02-04

Valves

 #9
20210025385
2021-01-28

Oil field pumps with reduced maintenance

 #10
20210010372
2021-01-14

PULSATION-FREE WET SPRAYING MACHINE

 #11
20200325880
2020-10-15

Piston/liner configuration coordination in a piston pump

 #12
20200064030
2020-02-27

Double acting alpha Stirling refrigerator

 #13
20190368476
2019-12-05

Piston-valve engagement in fluid sprayers

 #14
20190344263
2019-11-14

System for applying a reagent to a sample

 #15
20190316573
2019-10-17

Pump

 #16
20190242371
2019-08-08

Pump unit comprising an outer part, an inner part, and a top part with a piston, wherein the piston extends into the inner part and the top part is arranged to perform a scrolling movement whereby the inner part is caused to slide in a first direction relative to the outer part

 #17
20190203704
2019-07-04

Device for generating a pulsating hydraulic fluid pressure by a drivable working piston guided in a cylinder and an auxiliary piston guided in an auxiliary cylinder wherein the auxiliary piston transfers fluid to an auxiliary channel only in a first stroke section

 #18
20190176786
2019-06-13

Piston pump having an operating chamber with an inlet and an outlet a pressure medium connection and a connecting duct fluidly connecting the pressure medium connection to the operating chamber in an alternating controllable manner

 #19
20190128104
2019-05-02

Method of remanufacturing fluid end block

 #20
20190010934
2019-01-10

Volumetric pump

 #21
20180230993
2018-08-16

Ceramic pump and casting therefor

 #22
20180223822
2018-08-09

Reciprocating compressor

 #23
20180071761
2018-03-15

Piston engaging with valve for self-priming in fluid sprayers

 #24
20180001040
2018-01-04

Driving method for metering pump, driving apparatus for metering pump, vaporizer, and anesthesia apparatus

 #25
20170347842
2017-12-07

Uptake shroud for inverted pumps

 #26
20170218951
2017-08-03

Fluid End Block for Well Stimulation Pump and Method of Remanufacturing the Same

 #27
20170058878
2017-03-02

Hydraulic drive system for cryogenic pump

 #28
20160369790
2016-12-22

Occlusion detection techniques for a fluid infusion device having a rotary pump mechanism and an optical sensor

 #29
20160369789
2016-12-22

Occlusion detection techniques for a fluid infusion device having a rotary pump mechanism and sensor contact elements

 #30
20160369788
2016-12-22

Positive displacement plunger pump with gas escape valve

 #31
20160367754
2016-12-22

Occlusion detection techniques for a fluid infusion device having a rotary pump mechanism and multiple sensor contact elements

 #32
20160367750
2016-12-22

Occlusion detection techniques for a fluid infusion device having a rotary pump mechanism and a force sensor

 #33
20160161773
2016-06-09

Liquid crystal pump and method for ejecting liquid crystal using the same

 #34
20160123312
2016-05-05

Fluid pump having liquid reservoir and modified pressure relief slot

 #35
20160000999
2016-01-07

Internal cam metering pump

 #36
20150275892
2015-10-01

Fuel pump for an internal combustion engine

 #37
20150219099
2015-08-06

Rotary-oscillating subassembly and rotary-oscillating volumetric pumping device for volumetrically pumping a fluid

 #38
20150139825
2015-05-21

High-pressure pump

 #39
20140193281
2014-07-10

Fuel pump for an internal combustion engine

 #40
20140169998
2014-06-19

SEALED COMPRESSOR

 #41
20130209296
2013-08-15

Hydraulic Oil Cylinder, Correlative Device Thereof, Hydraulic Cushion System, Excavator And Concrete Pump Truck

 #42
20130189140
2013-07-25

Valveless reciprocating compressor

 #43
20130189139
2013-07-25

Valveless reciprocating compressor

 #44
20130121848
2013-05-16

Lishanski's vibratory cavitation pump

 #45
20130094984
2013-04-18

VARIABLE DISPLACEMENT COMPRESSOR SHAFT OIL SEPARATOR

 #46
20130034458
2013-02-07

Pump device for lubricant

 #47
20120312160
2012-12-13

Fluid pump having liquid reservoir and modified pressure relief slot

 #48
20120282127
2012-11-08

MATERIAL MOVING APPARATUS

 #49
20120251363
2012-10-04

High-pressure pump

 #50
20120251338
2012-10-04

Vibratory cavitation pump lishanski

 #51
20120141309
2012-06-07

Pump with side inlet valve for improved functioning in an inverted container

 #52
20110316359
2011-12-29

BISTABLE LINEAR MOTOR

 #53
20110120176
2011-05-26

Variable displacement compressor shaft oil separator

 #54
20100303656
2010-12-02

Metering pump and drive device thereof

 #55
20090180905
2009-07-16

Pump element and pump having such a pump element

 #56
20090116986
2009-05-07

Universal vibratory pump

 #57
20080310979
2008-12-18

Piston Pump With Improved Efficiency

 #58
20080294040
2008-11-27

Volumetric pump

 #59
20080236521
2008-10-02

Internal combustion engine

 #60
20080101962
2008-05-01

Vacuum pump

 #61
20080089800
2008-04-17

Fluid connection

 #62
20080022652
2008-01-31

FLUID PROPULSION DEVICE

 #63
20070261677
2007-11-15

Paired-piston linear engine

 #64
20070237662
2007-10-11

Compressor having a piston performing simultaneous functions

 #65
20070103018
2007-05-10

GAS ASPIRATION AND COMPRESSION SYSTEM, ESPECIALLY FOR GAS COMPRESSORS

 #66
20070041858
2007-02-22

BOOSTER-TYPE COMPRESSOR

 #67
20060280634
2006-12-14

Piston vacuum pump

 #68
20060131451
2006-06-22

Substance-atomizing apparatus

 #69
20060090477
2006-05-04

Piston compressor

 #70
20060029503
2006-02-09

Plunger pump and method of controlling discharge of the pump

 #71
20050265877
2005-12-01

Fluid connection

 #72
20050260085
2005-11-24

Dry-running reciprocating vacuum pump

 #73
20050194407
2005-09-08

Precision fluid dispensing system

 #74
20050158192
2005-07-21

Metering pump

 #75
20050123413
2005-06-09

Radial piston pump

 #76
20050006410
2005-01-13

Precision fluid dispensing system

 #77
17314138
2022-07-12

Gas operated unloader valve