ClassID:

143588

F04C18/18 - 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 of other than internal-axis type with toothed rotary pistons with similar tooth forms

Recent Application in this class:
#1
20250354555
2025-11-20

SUPERCHARGER ROTORS FOR INCREASED ENGINE POWER OUTPUT

#2
20250146490
2025-05-08

Parallel connected multiple shaft roots vacuum pump

#3
20240209856
2024-06-27

SUPERCHARGER ROTORS FOR INCREASED ENGINE POWER OUTPUT

#4
20230108876
2023-04-06

ROOTS BLOWER

#5
20230003208
2023-01-05

Redundant pumping system and pumping method by means of this pumping system

#6
20220196016
2022-06-23

Suction/compression rotating mechanism, rotary compressor and rotary engine

#7
20200109713
2020-04-09

INTEGRATED ROTARY POSITIVE-DISPLACEMENT MACHINERY

#8
20190383287
2019-12-19

Optimized helix angle rotors for roots-style supercharger

#9
20190211822
2019-07-11

Vacuum pump screw rotors with symmetrical profiles on low pitch sections

#10
20190113035
2019-04-18

OPTIMIZED ENERGY RECOVERY DEVICE ROTOR

#11
20180172636
2018-06-21

System for monitoring machine fluids by measuring fluctuations in a magnetic field

#12
20180135627
2018-05-17

Fluid working systems

#13
20180030983
2018-02-01

Vacuum pump with cooling apparatus

#14
20170314508
2017-11-02

Rotary compressor for gaseous fluids

#15
20170248019
2017-08-31

HYDROELECTRIC GEAR PUMP WITH VARYING HELIX ANGLES OF GEAR TEETH

#16
20170067464
2017-03-09

Optimized helix angle rotors for roots-style supercharger

#17
20160327038
2016-11-10

Fluid working systems

#18
20160273539
2016-09-22

Claw pump

#19
20160265528
2016-09-15

Gear pump or hydraulic gear motor with helical toothing provided with hydraulic system for axial thrust balance

#20
20160186756
2016-06-30

Compressor system with variable blowdown control

#21
20160108733
2016-04-21

Silent gear pump or motor suppressing troubles of trapping fluid

#22
20150345422
2015-12-03

Thermodynamically interactive heat flow process and multi-stage micro power plant

#23
20150330387
2015-11-19

Geared hydraulic machine and relative gear wheel

#24
20150211517
2015-07-30

Screw fluid machine, including male and female rotors

#25
20150118086
2015-04-30

Optimized helix angle rotors for roots-style supercharger

#26
20150071804
2015-03-12

Variable flow hydraulic machine

#27
20140322060
2014-10-30

Fluid-pressure apparatus with gears having tooth profiles

#28
20140308150
2014-10-16

Gear pump having grooved mounting adapter

#29
20140193285
2014-07-10

OPTIMIZED HELIX ANGLE ROTORS FOR ROOTS-STYLE SUPERCHARGER

#30
20120093673
2012-04-19

Six-blade biaxial rotary positive-displacement pump

#31
20110058974
2011-03-10

Optimized helix angle rotors for roots-style supercharger

#32
20090191083
2009-07-30

Rotary blower with isothermal air jacket

#33
20090148330
2009-06-11

Optimized helix angle rotors for Roots-style supercharger

#34
20090060728
2009-03-05

Pumps and pump-heads comprising internal pressure-absorbing member

#35
20060263230
2006-11-23

Optimized helix angle rotors for Roots-style supercharger

#36
20050107984
2005-05-19

Manufacturing apparatus and method for predicting life of rotary machine used in the same

#37
18744217
2025-05-27

Gear pump with suction housing element providing a tight seal between suction and high-pressure chamber to increase pump efficiency and method of providing tight seal

#38
18371548
2025-02-25

Compressor formed by identical rotors with circular arcs