Patents-Review.com
ClassID:

143666 ⎘

F04C28/08 - CPC Classification

Classification description:

Control of, monitoring of, or safety arrangements for, pumps or pumping installations specially adapted for elastic fluids characterised by varying the rotational speed

Recent Application in this class:
#1
20260139694
2026-05-21

LINEAR ACTUATOR ASSEMBLY AND SYSTEM

 #2
20260131970
2026-05-14

PUMP CONTROL SYSTEM FOR A REFUSE VEHICLE

 #3
20260126044
2026-05-07

SCROLL-TYPE ELECTRIC COMPRESSOR

 #4
20250327448
2025-10-23

Screw Compressor

 #5
20250264104
2025-08-21

NOISE AND VIBRATION MANAGEMENT FOR SMOKE EVACUATION SYSTEM

 #6
20250264101
2025-08-21

SCROLL COMPRESSOR

 #7
20250207705
2025-06-26

COMPACT PORTABLE OXYGEN CONCENTRATOR

 #8
20250207592
2025-06-26

COMPRESSOR APPARATUS AND METHOD OF OPERATING THE SAME

 #9
20250129781
2025-04-24

A VARIABLE-SPEED REFRIGERATING SCROLL COMPRESSOR WITH AN OIL FLOW REGULATING DEVICE

 #10
20250044007
2025-02-06

Compressor/Expander Machine

 #11
20240418169
2024-12-19

TWO-STAGE REFRIGERANT COMPRESSOR AND OPERATION METHOD THEREOF

 #12
20240401595
2024-12-05

METHOD FOR CONTROLLING A ROTARY SCREW COMPRESSOR

 #13
20240218878
2024-07-04

CONTROL METHOD FOR COMPRESSOR AND COMPRESSOR SYSTEM

 #14
20240035473
2024-02-01

Method for operating a compressor

 #15
20230400025
2023-12-14

Electrical Sprayer

 #16
20230383741
2023-11-30

Method for determining a discharge pressure of a rolling piston compressor

 #17
20230374958
2023-11-23

EGR pump system and control method of EGR pump

 #18
20230366400
2023-11-16

Gas compressor

 #19
20230366397
2023-11-16

SYSTEMS AND METHODS FOR OPERATION MODES FOR AN AIR COMPRESSOR

 #20
20230366391
2023-11-16

GAS COMPRESSOR

 #21
20230356937
2023-11-09

PUMP CONTROL SYSTEM FOR A REFUSE VEHICLE

 #22
20230340958
2023-10-26

NOISE AND VIBRATION MANAGEMENT FOR SMOKE EVACUATION SYSTEM

 #23
20230296096
2023-09-21

Lubricant-sealed vacuum pump, lubricant filter and method

 #24
20230279857
2023-09-07

Method for controlling a rotary screw compressor

 #25
20230228269
2023-07-20

Variable capacity screw compressor and method

 #26
20230167824
2023-06-01

Pump speed controlling method and apparatus, a computer program and a computer readable medium having stored thereon the computer program applied thereby and a pump

 #27
20230160513
2023-05-25

Compact portable oxygen concentrator

 #28
20230107879
2023-04-06

METHOD TO OPERATE A VACUUM SYSTEM

 #29
20230096279
2023-03-30

VACUUM SYSTEM HAVING CONDENSER AND ROOT VACUUM PUMP SET

 #30
20230033429
2023-02-02

Vacuum pump system and method for operating a vacuum pump system

 #31
20220325714
2022-10-13

Method for controlling the rotational speed of an electric motor driven compressor and control unit adapted to perform the method

 #32
20220268280
2022-08-25

Dual-Stage Compressor, Control Method Thereof and Air Conditioning Unit

 #33
20220186730
2022-06-16

Variable-frequency compressor with adaptive heating power control and method for operating the same

 #34
20220163054
2022-05-26

Linear actuator assembly and system

 #35
20220090601
2022-03-24

Screw compressor and control method therefor

 #36
20220090592
2022-03-24

Vacuum pumping

 #37
20220082100
2022-03-17

Method for controlling a rotary screw compressor

 #38
20220034319
2022-02-03

Screw compressor

 #39
20210396229
2021-12-23

Positive displacement machine with kinematic synchronization coupling and with driven moving parts having their own individual drives

 #40
20210381512
2021-12-09

Method and apparatus for controlling a scroll compressor using torque progression to reduce vibration

 #41
20210381499
2021-12-09

Method for operating a vacuum pump system

 #42
20210372406
2021-12-02

Variable compressor housing

 #43
20210372404
2021-12-02

Power saving vacuuming pump system based on complete-bearing-sealing and dry-large-pressure-difference root vacuuming root pumps

 #44
20210340977
2021-11-04

Variable capacity compressor operation mode determination method and device, variable capacity compressor, and air conditioner

 #45
20210316596
2021-10-14

Startup control systems and methods to reduce flooded startup conditions

 #46
20210310488
2021-10-07

Vacuum pump

 #47
20210293239
2021-09-23

Compressor and monitoring system

 #48
20210285447
2021-09-16

Variable capacity screw compressor and method

 #49
20210281208
2021-09-09

Variable speed drive with secondary windings

 #50
20210270260
2021-09-02

Compressor cylinder switching control method and device, unit and air conditioning system

 #51
20210207597
2021-07-08

Active hydraulic ripple cancellation methods and systems

 #52
20210156383
2021-05-27

Gas compressor

 #53
20210079915
2021-03-18

ELECTRONIC CAPACITY CONTROL VALVE FOR PORTABLE SCREW COMPRESSOR

 #54
20210071667
2021-03-11

EGR pump system and control method of EGR pump

 #55
20210071664
2021-03-11

EGR pump system and control method of EGR pump

 #56
20210054836
2021-02-25

Method for actuating a compressor system and a compressor system

 #57
20210025380
2021-01-28

Gas compressor and method for controlling same

 #58
20210017988
2021-01-21

Gas compressor

 #59
20200347854
2020-11-05

Linear Actuator Assembly and System

 #60
20200309303
2020-10-01

Compact portable oxygen concentrator

 #61
20200309115
2020-10-01

Compact portable oxygen concentrator

 #62
20200306485
2020-10-01

Compact portable oxygen concentrator

 #63
20200232355
2020-07-23

Machine provided with an oil pump and a method to start such a machine

 #64
20200224682
2020-07-16

Linear actuator assembly and system

 #65
20200208636
2020-07-02

Methods and systems to detect an operation condition of a compressor

 #66
20200189360
2020-06-18

Startup control systems and methods to reduce flooded startup conditions

 #67
20200132074
2020-04-30

Rotary compressors with variable speed and volume control

 #68
20200040895
2020-02-06

MULTISTAGE POWER SAVING VACUUM DEVICE WITH ROOT VACUUM PUMP IN FIRST STAGE

 #69
20200032801
2020-01-30

Method for operation control of compressor and the compressor

 #70
20200011324
2020-01-09

Gas compressor

 #71
20190345938
2019-11-14

Vacuum pump system and method for operating a vacuum pump system

 #72
20190285069
2019-09-19

In-vehicle motor-driven compressor and method for controlling in-vehicle motor-driven compressor

 #73
20190271315
2019-09-05

Method for operating a rolling piston compressor

 #74
20190264967
2019-08-29

MULTI-STAGE COMPRESSING SYSTEM AND CONTROL METHOD THEREOF

 #75
20190219316
2019-07-18

Scroll unloading detection system

 #76
20190201086
2019-07-04

Surgical evacuation sensing and display

 #77
20190162186
2019-05-30

Noise and vibration management for smoke evacuation system

 #78
20190162179
2019-05-30

Active hydraulic ripple cancellation methods and systems

 #79
20190128262
2019-05-02

Electrically driven mobile compressor or pump and method for controlling the maximum current that is taken from a power supply

 #80
20190113263
2019-04-18

Controller for compressor

 #81
20190017508
2019-01-17

Variable speed compressor protection system and method

 #82
20180356139
2018-12-13

Compressor control for increased efficiency

 #83
20180320688
2018-11-08

Variable volume chamber for interaction with a fluid

 #84
20180306189
2018-10-25

Oil circuit, oil-free compressor provided with such oil circuit and a method to control lubrication and/or cooling of such oil-free compressor via such oil circuit

 #85
20180291904
2018-10-11

Compressor system with internal air-water cooling

 #86
20180291902
2018-10-11

Method for controlling a rotary screw compressor

 #87
20180291901
2018-10-11

Gas Compressor

 #88
20180283379
2018-10-04

Method for regulating the rotational speed of a compressor as a function of the available gas flow of a source and regulation thereby applied

 #89
20180252153
2018-09-06

Intake air boost system for two-cycle engine having roots blowers

 #90
20180245594
2018-08-30

PUMP SYSTEM INCLUDING A CONTROLLER

 #91
20180223847
2018-08-09

Oil-cooled screw compressor and control method therefor

 #92
20180202443
2018-07-19

Compressor and method for controlling the rotational speed thereof

 #93
20180187681
2018-07-05

Drive device for electric compressor

 #94
20180180339
2018-06-28

Scroll unloading detection system

 #95
20180149156
2018-05-31

Modularized integrated non-coaxial multiple chamber dry vacuum pump

 #96
20180128524
2018-05-10

Cooling system

 #97
20180128523
2018-05-10

Cooling system

 #98
20180058454
2018-03-01

Electric compressor, control device, and monitoring method

 #99
20180023516
2018-01-25

Natural gas fueled vehicle

 #100
20180017060
2018-01-18

Variable volume ratio compressor

 #101
20180013336
2018-01-11

STATORS AND COILS FOR AXIAL-FLUX DYNAMOELECTRIC MACHINES

 #102
20180001738
2018-01-04

Startup control systems and methods to reduce flooded startup conditions

 #103
20170350397
2017-12-07

Method for controlling a gas supply to a vacuum pump

 #104
20170343261
2017-11-30

Screw compressor drive control

 #105
20170298937
2017-10-19

Method for controlling an oil-injected compressor device

 #106
20170284409
2017-10-05

Method for controlling motor-driven compressor configured to be installed in vehicle

 #107
20170282270
2017-10-05

Vacuum-processing device and control method therefor, and vacuum soldering device and control method therefor

 #108
20170241690
2017-08-24

Compressor Capacity Modulation System For Multiple Compressors

 #109
20170227273
2017-08-10

Controls and operation of variable frequency drives

 #110
20170218965
2017-08-03

Load/unload control method for compressor system

 #111
20170191475
2017-07-06

System and method for controlling a system that includes fixed speed and variable speed compressors

 #112
20170167769
2017-06-15

Axial thrust control for rotary compressors

 #113
20170114807
2017-04-27

Linear actuator assembly and system

 #114
20170096049
2017-04-06

Electrically-driven compressor for vehicle

 #115
20170089342
2017-03-30

Spindle compressor using refrigerant cooling for housing and rotor

 #116
20170058899
2017-03-02

Motor-driven compressor

 #117
20170058898
2017-03-02

Motor-driven compressor

 #118
20170051740
2017-02-23

Variable speed compressor protection system and method

 #119
20170016447
2017-01-19

METHOD AND APPARATUS IN CONNECTION WITH A SCREW COMPRESSOR

 #120
20160363361
2016-12-15

Simple inverter-control-type refrigerator, inverter control unit for refrigerator, and inverter compressor using same

 #121
20160348667
2016-12-01

Method and control circuit for controlling an electrical drive of an electrically driven compressed air compressor of a motor vehicle

 #122
20160281716
2016-09-29

Motor-driven compressor

 #123
20160177952
2016-06-23

MOBILE SLUDGE EXHAUSTER AND METHOD

 #124
20160146209
2016-05-26

Compressor driven by a motor based on a temperature of a drive circuit

 #125
20160135320
2016-05-12

CIRCUIT ASSEMBLY WITH VIBRATION-PROOF CIRCUIT COMPONENT FIXING STRUCTURE, AND VEHICULAR ELECTRIC COMPRESSOR

 #126
20160069347
2016-03-10

Method for soft expulsion of a fluid from a compressor at start-up

 #127
20160020659
2016-01-21

Electric motor, pump device using electric motor, and stator

 #128
20160003251
2016-01-07

Pump device and method for controlling the same

 #129
20160003242
2016-01-07

System and method for operating a pump

 #130
20150377536
2015-12-31

Controls and operation of variable frequency drives

 #131
20150292504
2015-10-15

INDUCED HOLLOW SPIRAL DRIVING APPARATUS

 #132
20150252805
2015-09-10

Methods and systems to detect an operation condition of a compressor

 #133
20150240814
2015-08-27

COMPRESSOR FOR NATURAL GAS

 #134
20150159651
2015-06-11

Motor-driven compressor with switching element

 #135
20150093273
2015-04-02

Rotary compressors with variable speed and volume control

 #136
20150093254
2015-04-02

MOTOR-DRIVEN COMPRESSOR

 #137
20150052921
2015-02-26

Screw compressor drive control

 #138
20150030490
2015-01-29

Bearing Housing and Assembly of a Screw Compressor

 #139
20150030489
2015-01-29

Variable capacity screw compressor and method

 #140
20140377084
2014-12-25

Liquid ring vacuum pump with cavitation regulation

 #141
20140230467
2014-08-21

Scroll compressor differential pressure control during compressor shutdown transitions

 #142
20140230466
2014-08-21

Scroll compressor differential pressure control during compressor startup transitions

 #143
20140196490
2014-07-17

System and method for controlling a variable speed drive of a compressor motor

 #144
20140147325
2014-05-29

Water injected scroll air compressor

 #145
20140134032
2014-05-15

Scroll compressor

 #146
20140105757
2014-04-17

System and method of remotely connecting and disconnecting the auxiliary power supply of a frequency inverter for variable capacity compressor employed in cooling systems

 #147
20140105754
2014-04-17

Control method of electric compressor, controller, and refrigerator

 #148
20140056727
2014-02-27

Refrigerant compressor and refrigeration cycle apparatus using the same

 #149
20140044562
2014-02-13

Compressor and control method thereof

 #150
20130343942
2013-12-26

Rotary compressor

 #151
20130294932
2013-11-07

Oil-flooded screw compressor, motor drive system, and motor control

 #152
20130287592
2013-10-31

Compressed gas supply unit

 #153
20130240043
2013-09-19

Variable speed compressor protection system and method

 #154
20130236331
2013-09-12

COMPRESSOR AND CONTROLLER WITH ALTITUDE COMPENSATION

 #155
20130156623
2013-06-20

Variable-speed scroll refrigeration compressor

 #156
20130156612
2013-06-20

Oil injection device for variable-speed scroll refrigeration compressor

 #157
20130145787
2013-06-13

Screw compressor drive control

 #158
20130064684
2013-03-14

CONTROLLER OF COMPRESSOR

 #159
20130039741
2013-02-14

Compression apparatus

 #160
20120316713
2012-12-13

State of charge adjusted compressor control

 #161
20120315151
2012-12-13

Current control via speed control for driving screw compressor under cold conditions

 #162
20120303311
2012-11-29

Method for calculating the probability of moisture build-up in a compressor

 #163
20120251347
2012-10-04

COMPRESSOR WITH TRANSMISSION

 #164
20120224986
2012-09-06

Rotary vane compressor

 #165
20120063917
2012-03-15

Roughing pump method for a positive displacement pump

 #166
20120017634
2012-01-26

Variable capacity screw compressor and method

 #167
20110318211
2011-12-29

Scroll compressor having a pass hole for preventing over-compression under a low load condition

 #168
20110274574
2011-11-10

Water injected scroll air compressor

 #169
20110271699
2011-11-10

FREQUENCY VARIABLE COMPRESSOR AND CONTROL METHOD THEREOF

 #170
20110243775
2011-10-06

Scroll compressor

 #171
20110243766
2011-10-06

Compressor with transmission

 #172
20110211973
2011-09-01

Compressor with oil level controller

 #173
20110194963
2011-08-11

Water injected scroll air compressor

 #174
20110138831
2011-06-16

REFRIGERATION CYCLE APPARATUS

 #175
20110129355
2011-06-02

Method for controlling the vacuum generator(s) in a vacuum sewage system

 #176
20110110802
2011-05-12

Compressor assembly

 #177
20110041533
2011-02-24

Screw compressor drive control

 #178
20100247349
2010-09-30

Integrated-inverter electric compressor

 #179
20100246083
2010-09-30

METHOD FOR CONTROLLING ELECTRIC COMPRESSOR

 #180
20100209259
2010-08-19

EVACUATION APPARATUS

 #181
20100178174
2010-07-15

Compressor system

 #182
20100111707
2010-05-06

Robust PID control for BLDC motor controller

 #183
20100077793
2010-04-01

Inverter-device built-in type electric compressor and vehicle equipped with the same compressor

 #184
20100040487
2010-02-18

Device for adjusting the flow rate of a mobile oil-injected screw-type compressor

 #185
20100028165
2010-02-04

Oil-flooded screw compressor, motor drive system, and motor control device

 #186
20100018465
2010-01-28

Method in a milking system for creating a required vacuum level and computer program products

 #187
20090317261
2009-12-24

Pumping system and method of operation

 #188
20090308086
2009-12-17

REFRIGERANT SYSTEM WITH MULTI-SPEED PULSE WIDTH MODULATED COMPRESSOR

 #189
20090304524
2009-12-10

Method of operating a pumping system

 #190
20090304522
2009-12-10

Installation for high pressure compression with several stages

 #191
20090269220
2009-10-29

ELECTRIC COMPRESSOR

 #192
20090090118
2009-04-09

Variable speed compressor protection system and method

 #193
20090041602
2009-02-12

Scroll-type refrigerant compressor having fluid communication between lubrication duct and return duct

 #194
20090041598
2009-02-12

Electric compressor and control device for estimating compressor discharge temperature

 #195
20090039808
2009-02-12

Motor control device and compressor

 #196
20090035168
2009-02-05

Scroll-type refrigerant compressor having fluid flowing from gas inlet to motor winding end chamber through intermediate jacket

 #197
20090016898
2009-01-15

Compressor device

 #198
20080315816
2008-12-25

Motor control device and compressor

 #199
20080286118
2008-11-20

Capacity modulated scroll compressor system and method

 #200
20080286087
2008-11-20

System and a Method for Capacity Control in a Screw Compressor

 #201
20080240953
2008-10-02

ROTARY COMPRESSOR UNIT AND METHOD OF CONTROLLING OPERATION THEREOF

 #202
20080236192
2008-10-02

Rotary compressor and heat pump system

 #203
20080223057
2008-09-18

Refrigerant System with Pulse Width Modulated Components and Variable Speed Compressor

 #204
20080181791
2008-07-31

Electric compressor

 #205
20080175717
2008-07-24

System and method of operation of multiple screw compressors with continuously variable speed to provide noise cancellation

 #206
20080145240
2008-06-19

Control system and method for protection against breakage of lubricanting-oil film in compressor bearings

 #207
20080087030
2008-04-17

Water-cooled air conditioner

 #208
20080087027
2008-04-17

Water-cooled air conditioner

 #209
20080085180
2008-04-10

VARIABLE CAPACITY NATURAL GAS COMPRESSOR

 #210
20080063536
2008-03-13

Method of controlling the stopping operation of vacuum pump and device therefor

 #211
20080044307
2008-02-21

Compact helical compressor for mobile use in a vehicle

 #212
20080038127
2008-02-14

SCREW COMPRESSOR

 #213
20070227821
2007-10-04

APPARATUS FOR CONTROLLING QUANTITY OF FEEDING OIL OF INVERTER COMPRESSOR

 #214
20070207045
2007-09-06

Compressor

 #215
20070189907
2007-08-16

Pump apparatus, system having the same, and method for operating the same

 #216
20070177983
2007-08-02

AIRFLOW COMPRESSOR CONTROL SYSTEM AND METHOD

 #217
20070140866
2007-06-21

Oil-injection screw compressor

 #218
20070104587
2007-05-10

Evacuation apparatus

 #219
20070068181
2007-03-29

Method of controlling compressor for refrigerator and apparatus thereof

 #220
20070022771
2007-02-01

Cooling system with variable capacity control

 #221
20070020111
2007-01-25

Fast enclosure pumping with power saving

 #222
20060288715
2006-12-28

Compressor with capacity control

 #223
20060257273
2006-11-16

Open drive scroll machine

 #224
20060222549
2006-10-05

Apparatus for controlling quantity of feeding oil of inverter compressor

 #225
20060222511
2006-10-05

Multicylindrical rotary compressor

 #226
20060222510
2006-10-05

Prevention of unpowered reverse rotation in compressors

 #227
20060222506
2006-10-05

Rapidly pumping out an enclosure while limiting energy consumption

 #228
20060210408
2006-09-21

Hermetically sealed compressor having oil supply mechanism based on refrigerant pressure

 #229
20060193728
2006-08-31

System and method for controlling a variable speed compressor during stopping

 #230
20060119302
2006-06-08

Method of controlling motor drive speed

 #231
20060093494
2006-05-04

Rotary hermetic compressor and refrigeration cycle system

 #232
20060039805
2006-02-23

Variable inner volume ratio-type inverter screw compressor

 #233
20060018764
2006-01-26

System and method to reduce acoustic noise in screw compressors

 #234
20050268631
2005-12-08

Apparatus for driving a compressor and a refrigerating air conditioner

 #235
20050233854
2005-10-20

Variable speed compressor

 #236
20050232791
2005-10-20

Dual-shaft vacuum pump

 #237
20050217288
2005-10-06

System utilizing waste heat of internal combustion engine

 #238
20050214137
2005-09-29

Multicylinder rotary compressor and compressing system and refrigerating unit provided with same

 #239
20050214128
2005-09-29

Speed control for compressors

 #240
20050188708
2005-09-01

System and method for variable speed operation of a screw compressor

 #241
20050163623
2005-07-28

Air supply apparatus for stable air supply

 #242
20050126194
2005-06-16

Refrigerant cycle apparatus

 #243
20050123407
2005-06-09

System and method for noise attenuation of screw compressors

 #244
20050086960
2005-04-28

Refrigerating machine

 #245
20050086959
2005-04-28

Method and apparatus for variable frequency controlled compressor and fan

 #246
20050068001
2005-03-31

Frequency converter for different mains voltages