ClassID:

143643

F04C23/003 - CPC Classification

Classification description:

Combinations of two or more pumps, each being of rotary-piston or oscillating-piston type, specially adapted for elastic fluids; Pumping installations specially adapted for elastic fluids; Multi-stage pumps specially adapted for elastic fluids of similar working principle having complementary function

Recent Application in this class:
#1
20250146490
2025-05-08

Parallel connected multiple shaft roots vacuum pump

#2
20250129784
2025-04-24

MULTI-STAGE COMPRESSOR HAVING INTERSTAGE LUBRICANT INJECTION VIA AN INJECTION ROD

#3
20240401595
2024-12-05

METHOD FOR CONTROLLING A ROTARY SCREW COMPRESSOR

#4
20240003347
2024-01-04

Multi-stage compressor having interstage lubricant injection via an injection rod

#5
20230323879
2023-10-12

VACUUM PUMP

#6
20230279857
2023-09-07

Method for controlling a rotary screw compressor

#7
20230096279
2023-03-30

VACUUM SYSTEM HAVING CONDENSER AND ROOT VACUUM PUMP SET

#8
20220389930
2022-12-08

Multi-stage pump apparatus including sealing member

#9
20220332168
2022-10-20

System for heating and/or cooling an interior environment

#10
20220120278
2022-04-21

Multi-stage compressor having interstage lubricant injection via an injection rod

#11
20220082100
2022-03-17

Method for controlling a rotary screw compressor

#12
20210381509
2021-12-09

Pumping unit including a rough vacuum pump and a roots vacuum pump

#13
20210372404
2021-12-02

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

#14
20200277957
2020-09-03

Multi-stage compressor and air conditioner having a linkage between the vanes of the different stages

#15
20200054992
2020-02-20

Dryer for compressed gas, compressor installation provided with such a dryer and method for drying gas

#16
20200040895
2020-02-06

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

#17
20190271316
2019-09-05

Multi-stage compressor having interstage lubricant injection via an injection rod

#18
20190203714
2019-07-04

ROTARY CYLINDER TYPE COMPRESSOR

#19
20190112197
2019-04-18

METHOD AND APPARATUS FOR COMPRESSION OF AMMONIA SYNTHESIS GAS AND RECYCLE GAS FOR THE PRODUCTION OF AMMONIA BY SCREW COMPRESSORS

#20
20180363650
2018-12-20

Screw compressor

#21
20180298902
2018-10-18

Multi-stage rotary vane pump

#22
20180291902
2018-10-11

Method for controlling a rotary screw compressor

#23
20180258798
2018-09-13

APPARATUS, SYSTEMS, AND METHODS FOR LOW GRADE WASTE HEAT MANAGEMENT

#24
20180223846
2018-08-09

High efficiency heating and/or cooling system and methods

#25
20180163721
2018-06-14

Pump device

#26
20180093898
2018-04-05

Method for compression of ammonia synthesis gas and recycle gas for the production of ammonia by screw compressors

#27
20180017057
2018-01-18

Rotary compressor

#28
20180017056
2018-01-18

Cylinder-rotation compressor with improved vane and suction passage locations

#29
20180003178
2018-01-04

Vacuum exhaust system and channel-switching valve used in this vacuum exhaust system

#30
20170350623
2017-12-07

REFRIGERATION CYCLE DEVICE AND COMPRESSOR USED IN SAME

#31
20170350394
2017-12-07

Rotary-type compressor

#32
20170348634
2017-12-07

Dryer for compressed gas, compressor installation provided with such a dryer and method for drying gas

#33
20170314560
2017-11-02

Compressor, air conditioning system, and a method of controlling a compressor

#34
20170292525
2017-10-12

Integrally geared compressor having a combination of centrifugal and positive displacement compression stages

#35
20170268513
2017-09-21

Suction line arrangement for multiple compressor system

#36
20170130716
2017-05-11

Revolving outer body rotary vane compressor or expander

#37
20170104399
2017-04-13

Electric motor and compressor having the same

#38
20170074265
2017-03-16

Scroll fluid machine having tip seal member separated into different portions

#39
20170037726
2017-02-09

Intake device, power generator, external combustion system using intake device and power generator, internal combustion system using intake device and power generator, and air hybrid power generation system using intake device and power generator

#40
20170030355
2017-02-02

Air conditioner with stacked parallel and serial compressor cylinders

#41
20160369783
2016-12-22

KINETIC ENERGY RECOVERY SYSTEM

#42
20160356273
2016-12-08

Vacuum pump system with light gas pumping and leak detection apparatus comprising the same

#43
20160305429
2016-10-20

Rotary compressor and compression unit thereof, and air conditioner

#44
20160282019
2016-09-29

Expansion compressor apparatus and air conditioner having the same

#45
20160130984
2016-05-12

Apparatus, systems, and methods for low grade waste heat management

#46
20160053761
2016-02-25

Screw pump

#47
20150322790
2015-11-12

Rotation device and rotor compressor and fluid motor having the same

#48
20150170938
2015-06-18

Method and device for pumping of a process chamber

#49
20150167672
2015-06-18

SCROLL COMPRESSOR

#50
20150167598
2015-06-18

Rotational pump and fuel vapor leakage detection device having the same

#51
20150118091
2015-04-30

Rotary compressor with vapor injection system

#52
20150037187
2015-02-05

Pump

#53
20150037186
2015-02-05

Structure for stabilizing an orbiting scroll in a scroll compressor

#54
20150037185
2015-02-05

Orbiting crankshaft drive pin and associated drive pin sleeve geometry

#55
20150037184
2015-02-05

Double-ended scroll compressor lubrication of one orbiting scroll bearing via crankshaft oil gallery from another orbiting scroll bearing

#56
20140294640
2014-10-02

Scroll pump having separable orbiting plate scroll and method of replacing tip seal

#57
20140294609
2014-10-02

Gas pumping and treatment device

#58
20140241909
2014-08-28

System including high-side and low-side compressors

#59
20140238066
2014-08-28

System including high-side and low-side compressors

#60
20140205483
2014-07-24

Roots pump connection channels separating adjacent pump stages

#61
20120124996
2012-05-24

Dual-inlet supercharger for EGR flow control

#62
20110131980
2011-06-09

Dual-inlet supercharger for EGR flow control

#63
20100326124
2010-12-30

EXPANDER-INTEGRATED COMPRESSOR AND REFRIGERATION CYCLE APPARATUS USING THE SAME

#64
20100202909
2010-08-12

Fluid machine and refrigeration cycle apparatus

#65
20100180628
2010-07-22

Expander-integrated compressor and refrigeration-cycle apparatus with the same

#66
20100101268
2010-04-29

REFRIGERATION SYSTEM

#67
20090100860
2009-04-23

Fluid machine

#68
20090060768
2009-03-05

Scroll Fluid Machine

#69
20080206072
2008-08-28

Vacuum Apparatus

#70
20080085206
2008-04-10

Fluid machine

#71
20070251245
2007-11-01

Refrigeration apparatus with expander control for improved coefficient of performance

#72
20070196227
2007-08-23

Rotary expander

#73
20060216181
2006-09-28

SCROLL FLUID MACHINE COMPRISING COMPRESSING AND EXPANDING SECTIONS

#74
20060130495
2006-06-22

System and method of refrigeration

#75
20050262858
2005-12-01

Heat cycle

#76
20050172622
2005-08-11

Scroll-type expander having heating structure and scroll-type heat exchange system employing the expander

#77
20050086960
2005-04-28

Refrigerating machine

#78
20050069440
2005-03-31

Multistage dry pump

#79
20050031469
2005-02-10

Scroll fluid machine comprising compressing and expanding sections

#80
20050031463
2005-02-10

Continuous variable suction system