ClassID:

146153

F15B21/005 - CPC Classification

Classification description:

Common features of fluid actuator systems; Fluid-pressure actuator systems or details thereof, not covered by any other group of this subclass Filling or draining of fluid systems

Recent Application in this class:
#1
20260138857
2026-05-21

OIL RELEASE MECHANISM FOR LIGHTWEIGHT JACK

#2
20260138250
2026-05-21

HYDRAULIC QUICK COUPLER DECOMPRESSION TOOL FOR FLAT FACE MALE COUPLERS

#3
20260126104
2026-05-07

HYDRAULIC SYSTEMS FOR A POWER MACHINE

#4
20260029004
2026-01-29

SYSTEM, METHOD, APPARATUS, DEVICE AND KIT FOR CONTAINING OIL DURING A HYDRAULIC PURGE

#5
20260009410
2026-01-08

HYDRODYNAMIC RETARDER INCLUDING A WORKING MEDIUM TANK

#6
20250388278
2025-12-25

DUAL ACTING HYDRAULIC SYSTEM AND RELATED DEVICES AND METHODS

#7
20250382980
2025-12-18

HYDRAULIC DRIVE DEVICE

#8
20250369460
2025-12-04

Hydraulic Drive System

#9
20250188964
2025-06-12

HYDRAULIC DEVICE WITH CASE DRAIN SYSTEM

#10
20250171163
2025-05-29

HYDRAULIC SYSTEM FOR AN AIRCRAFT, HYDRAULIC ARRANGEMENT, AIRCRAFT, AIRCRAFT ARRANGEMENT, AND METHOD FOR TESTING SUCH HYDRAULIC SYSTEM

#11
20250059731
2025-02-20

SYSTEM FOR RETURNING FLUID FROM HYDRAULIC DEVICES OF WORK MACHINES

#12
20240392810
2024-11-28

Dual Mode Force Control for Surface Engaging Machinery

#13
20240383307
2024-11-21

SINGLE AXLE ROLL CONTROL SYSTEM WITH GEROTOR PUMP

#14
20240383306
2024-11-21

Single axle roll control system that includes a dual chamber ball-screw mechanism

#15
20240383302
2024-11-21

SINGLE AXLE ROLL CONTROL SYSTEM WITH MULTIPLE PRESSURIZING DEVICES ARRANGED IN SERIES

#16
20240383301
2024-11-21

SINGLE AXLE HEAVE CONTROL SYSTEM

#17
20240367632
2024-11-07

BRAKE SIGNAL TRANSMITTER, BRAKING SYSTEM, AND VEHICLE

#18
20240352954
2024-10-24

HYDRAULIC SYSTEM, MINING VEHICLE AND METHOD

#19
20240255011
2024-08-01

METHOD OF OPERATING A HYDRAULIC SYSTEM FROM AN OFF-STATE IN A COLD ENVIRONMENT

#20
20240217649
2024-07-04

CONTROLLING RATE OF ROTOR FEATHER BY SYSTEM SECONDARY TO PRIMARY BLADE ANGLE CONTROL SYSTEM

#21
20240209874
2024-06-27

OIL DRAIN VALVE, ENERGY ACCUMULATION DEVICE, HYDRAULIC SYSTEM AND WORKING MACHINE

#22
20240125339
2024-04-18

SYSTEM, METHOD, APPARATUS, DEVICE AND KIT FOR CONTAINING OIL DURING A HYDRAULIC PURGE

#23
20230374922
2023-11-23

VALVE ASSEMBLY FOR MACHINE FLUID OPERATIONS

#24
20230296118
2023-09-21

Method for filling a hydraulic circuit of an electro-hydrostatic system using a filling device

#25
20230139542
2023-05-04

DEVICE FOR CONTROLLING THE EXHAUST OF A VEHICLE PNEUMATIC SYSTEM

#26
20230126930
2023-04-27

Method of removing hydraulic fluid from an aircraft hydraulic system, an aircraft hydraulic system, and an aircraft

#27
20230087782
2023-03-23

Soil processing machine and method for operating a soil processing machine

#28
20220372998
2022-11-24

Gasket device and pneumatic valve system for a commercial vehicle

#29
20220154738
2022-05-19

Work machine and control method

#30
20210404490
2021-12-30

Compressed-air treatment system and method for operating a compressed-air treatment system

#31
20210381406
2021-12-09

Valve assembly for machine fluid operations

#32
20210332837
2021-10-28

Automatic water handling device of air compressor

#33
20210301842
2021-09-30

DRAIN FOR HYDRAULIC SYSTEM

#34
20210164501
2021-06-03

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

#35
20210112713
2021-04-22

Header suspension for pivoting header of combine harvester

#36
20200400166
2020-12-24

LOAD-ADJUSTING QUICK OIL CYLINDER AND HYDRAULIC LIFTING DEVICE

#37
20200337239
2020-10-29

Damped float response on an agricultural harvester

#38
20200256479
2020-08-13

Steam valve driving apparatus

#39
20200149683
2020-05-14

Safety system for a pressure accumulator

#40
20200123940
2020-04-23

Valve assembly for machine fluid operations

#41
20200049173
2020-02-13

Valve System For Flushing Contaminated Hydraulic Fluid

#42
20200049172
2020-02-13

Control system for flushing contaminated hydraulic fluid

#43
20190359474
2019-11-28

TRANSMISSION FLUID REPLACEMENT

#44
20190323525
2019-10-24

Hydraulic systems and methods for powering auxiliary circuits

#45
20190203745
2019-07-04

Self-cleaning mechanism for pneumatic central clutch release

#46
20190195250
2019-06-27

Method and apparatus for cleaning and/or replacing hydraulic oil in hydraulic drives

#47
20190178267
2019-06-13

ASSEMBLY FOR FILLING A GAS TANK

#48
20190093680
2019-03-28

HYDRAULIC CONTROL DEVICE FOR VEHICLE DRIVE DEVICE

#49
20190072178
2019-03-07

Hydrostatic valve arrangement, hydrostatic gear having the valve arrangement, and hydrostatic drive having the gear

#50
20190048901
2019-02-14

Reusable gas generator driven pressure supply system

#51
20180355546
2018-12-13

Hydraulic leveling device of washing machine and filling method thereof

#52
20180223879
2018-08-09

Pressure limiting device, in particular for an assist system for vehicles

#53
20180094656
2018-04-05

Working machine

#54
20180044889
2018-02-15

Hydraulic equipment for excavators and operating machines in general

#55
20180036783
2018-02-08

Die cushion device

#56
20170350524
2017-12-07

Control valve device

#57
20170306993
2017-10-26

Varnish mitigation process

#58
20170241446
2017-08-24

High-precision hydraulic actuator

#59
20170152875
2017-06-01

Compressed-air supply installation, pneumatic system, and method for controlling a compressed-air supply installation

#60
20170152775
2017-06-01

Valve assembly for machine fluid operations

#61
20170130427
2017-05-11

Device and process for controlling and optimizing hydraulic system performance

#62
20170129300
2017-05-11

Compressed-air supply system, pneumatic system and method for operating a compressed-air supply system

#63
20170106943
2017-04-20

Bicycle hydraulic component

#64
20170045127
2017-02-16

Hydraulic control unit for a limited slip differential

#65
20170023032
2017-01-26

Loop-flushing-system for hydrostatic apparatus

#66
20160305568
2016-10-20

Valve having electro-mechanical actuator and a control device with a delay circuit

#67
20160215797
2016-07-28

Self priming hydraulic pump and circuit

#68
20160138620
2016-05-19

Load sensing control circuit

#69
20160037721
2016-02-11

Pressure control for hydraulically actuated agricultural headers

#70
20150360274
2015-12-17

Die cushion device

#71
20150354609
2015-12-10

Hydraulic flushing system and method

#72
20150330474
2015-11-19

Hydraulic system

#73
20150292531
2015-10-15

METHODS AND SYSTEMS FOR PERFORMING, MONITORING AND ANALYZING MULTIPLE MACHINE FLUID PROCESSES

#74
20150226240
2015-08-13

FLUID ISOLATOR

#75
20150082784
2015-03-26

Flushing circuit for hydraulic cylinder drive circuit

#76
20150027569
2015-01-29

Hydraulic attachment

#77
20140373940
2014-12-25

FLUID DRAIN MANIFOLD

#78
20140366519
2014-12-18

Hydraulic closed circuit system

#79
20140338320
2014-11-20

Oil level control device

#80
20140290761
2014-10-02

Valve assembly for machine fluid operations

#81
20140190158
2014-07-10

Hydraulic circuit, and combination valve used in same hydraulic circuit

#82
20140105756
2014-04-17

Fluid pump speed control

#83
20130276439
2013-10-24

Hydraulic pump system and method of operation

#84
20130028695
2013-01-31

HYDRAULIC CIRCUIT AND WORKING MACHINE INCLUDING THE SAME

#85
20120204776
2012-08-16

Hydraulic system for a watercraft

#86
20110253252
2011-10-20

BRAKE BLEEDING APPARATUS

#87
20110127115
2011-06-02

DRIVE SYSTEMS

#88
20090101551
2009-04-23

Oil changing device

#89
20080238187
2008-10-02

Hydrostatic drive system with variable charge pump

#90
20080083461
2008-04-10

FLUID EXCHANGE APPARATUS WITH LOCKING FLOW ALIGNMENT DEVICE

#91
20080047263
2008-02-28

Hydraulic circuit having a multifunction selector

#92
20070261277
2007-11-15

Work machine

#93
20070210646
2007-09-13

Method and plant for filling a hydraulic circuit with a control fluid

#94
20070181195
2007-08-09

Switching mechanism

#95
20070134103
2007-06-14

Hydraulic distributor comprising an input element with a scavenging valve

#96
20070113894
2007-05-24

Methods and systems for performing, monitoring and analyzing multiple machine fluid processes

#97
20060053784
2006-03-16

Exchange and/or scavenging device for a circuit comprising at least one hydraulic motor

#98
20050269180
2005-12-08

Master cylinder

#99
20050173004
2005-08-11

Methods and systems for performing, monitoring and analyzing multiple machine fluid processes

#100
20050109026
2005-05-26

Open hydraulic circuit including a relief valve device

#101
20050076958
2005-04-14

Control apparatus, method and diagnostic for hydraulic fill and drain

#102
15231998
2017-08-01

Varnish mitigation process