F04C18/08 - CPC Classification Index

ClassID:

143572 ⎘

F04C18/08 - CPC Classification

Classification description:

Rotary-piston pumps specially adapted for elastic fluids of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing

Sub-classes:

F04C18/082 » {Details specially related to intermeshing engagement type pumps} 21
F04C18/10 » of internal-axis type with the outer member having more teeth or tooth equivalents, e.g. rollers, than the inner member 48
F04C18/12 » of other than internal-axis type 24

Recent Application in this class:

20260126043

2026-05-07

POSITIVE-DISPLACEMENT FLUID MACHINE WITH CONSTRAINED GEARSET

20250199550

2025-06-19

FLUID HANDLING PROTECTION SYSTEM

20240141896

2024-05-02

Multi-stage screw compressor

20240110565

2024-04-04

Rotor assembly, compressor and air conditioner

20240068475

2024-02-29

Screw compressor having working chamber closing member to regulate suction working medium flow to a working chamber

20220389930

2022-12-08

Multi-stage pump apparatus including sealing member

20210207597

2021-07-08

Active hydraulic ripple cancellation methods and systems

20210180596

2021-06-17

Pump system for semiconductor chamber

20200200171

2020-06-25

Screw compressor including spoked gear

#10

20200116233

2020-04-16

Transmission and compressor or vacuum pump provided with such a transmission

#11

20200072221

2020-03-05

Transmission and compressor or vacuum pump provided with such a transmission

#12

20200063738

2020-02-27

Compressor or vacuum pump provided with a transmission

#13

20190226480

2019-07-25

Motor-driven roots pump

#14

20190162179

2019-05-30

Active hydraulic ripple cancellation methods and systems

#15

20170045048

2017-02-16

Multi-stage pump assembly having a pressure controlled valve for controlling recirculation of fluid from the pump stage outlet to the pump stage inlet

#16

20170038107

2017-02-09

Screw compressor and chiller unit provided with same

#17

20160265521

2016-09-15

PUMP ASSEMBLIES

#18

20160230760

2016-08-11

POSITIVE DISPLACEMENT GEAR PUMP

#19

20160047377

2016-02-18

Positive displacement gear pump

#20

20150336190

2015-11-26

Method of machining a rotor with variable-lead screw

#21

20150226218

2015-08-13

Screw compressor and chiller unit provided with same

#22

20150211520

2015-07-30

VANE TYPE VACUUM PUMP

#23

20150192129

2015-07-09

Rotary compressor, method of manufacturing a rotary compressor, and apparatus for manufacturing a rotary compressor

#24

20150184657

2015-07-02

Positive displacement rotary devices with uniquely configured voids

#25

20150184656

2015-07-02

Vacuum scroll pump having pressure-balanced orbiting plate scroll

#26

20150107680

2015-04-23

MODULATING CHECK VALVE

#27

20150104343

2015-04-16

BALANCE SHAFT MODULE HAVING VARIABLE DISPLACEMENT OIL PUMP

#28

20150064041

2015-03-05

Positive displacement pump with improved sealing arrangement and related method of making

#29

20140314608

2014-10-23

INTERNAL-GEAR-TYPE OIL PUMP FOR VEHICLE

#30

20140308147

2014-10-16

Gerotor apparatus for a quasi-isothermal Brayton cycle engine

#31

20140294647

2014-10-02

Pre-compression dual spring pump control

#32

20140294642

2014-10-02

Vane compressor that suppresses the wear at the tip of the vane

#33

20140271311

2014-09-18

Internal gear pump with axial disk and intermediate piece

#34

20140227122

2014-08-14

Claw pump with relief space

#35

20140099225

2014-04-10

Multi-stage pump assembly having a pressure controlled valve for controlling recirculation of fluid from the pump stage outlet to the pump stage inlet

#36