ClassID:

136716

F01C21/008 - CPC Classification

Classification description:

Component parts, details or accessories not provided for in groups  -  Driving elements, brakes, couplings, transmissions specially adapted for rotary or oscillating-piston machines or engines

Recent Application in this class:
#1
20250290420
2025-09-18

Positive displacement rotary machine

#2
20250290419
2025-09-18

ROTATIONAL ENGINE

#3
20250243759
2025-07-31

ROTATIONAL ENGINE WITH INNER AND OUTER RINGS

#4
20250146416
2025-05-08

ROTARY MACHINE

#5
20250136418
2025-05-01

Rotary Drive Device

#6
20250102067
2025-03-27

METHODS AND SYSTEMS FOR SEALING ROTATING EQUIPMENT SUCH AS EXPANDERS OR COMPRESSORS

#7
20250059891
2025-02-20

HIGH-EFFICIENCY SINE ROTARY ENGINE

#8
20240191626
2024-06-13

Rotary machine

#9
20240141789
2024-05-02

Rotational engine with inner and outer rings

#10
20230358137
2023-11-09

TWO STROKE INTERNAL COMBUSTION ROTARY ENGINE WITH ZINDLER CURVE RING GEAR

#11
20230203950
2023-06-29

Rotary machine

#12
20220290565
2022-09-15

Rotary engine with recirculating arc roller power transfer

#13
20220127998
2022-04-28

SINGLE CHAMBER MULTIPLE INDEPENDENT CONTOUR ROTARY MACHINE

#14
20220018282
2022-01-20

Rotary vane internal combustion engine

#15
20220018255
2022-01-20

Rotational engine with inner and outer rings

#16
20210381425
2021-12-09

ROTARY VANE INTERNAL COMBUSTION ENGINE

#17
20210010374
2021-01-14

ROTARY ENGINE WITH RECIRCULATING ARC ROLLER POWER TRANSFER

#18
20200408096
2020-12-31

Roticulating thermodynamic apparatus

#19
20200400023
2020-12-24

Roticulating thermodynamic apparatus

#20
20200318547
2020-10-08

Auxiliary power unit with intercooler

#21
20200270993
2020-08-27

Rotary fluid pressure device with drive-in-drive valve arrangement

#22
20200088034
2020-03-19

MECHANISM WITH ROTATING VANES

#23
20200011426
2020-01-09

Methods and systems for sealing rotating equipment such as expanders or compressors

#24
20190226395
2019-07-25

Single chamber multiple independent contour rotary machine

#25
20190112974
2019-04-18

Toroidal engine

#26
20180334955
2018-11-22

Rotary engine

#27
20180223730
2018-08-09

Actuator of link mechanism for internal combustion engine

#28
20180179948
2018-06-28

Compound engine assembly with cantilevered compressor and turbine

#29
20180128105
2018-05-10

Rotary piston and cylinder devices

#30
20180106151
2018-04-19

Electromagnetic only vane coordination of a cat and mouse engine

#31
20180066520
2018-03-08

Rotary engine with intake and exhaust through rotor shaft

#32
20180030858
2018-02-01

Scissor type compression and expansion machine used in a thermal energy recuperation system

#33
20170362938
2017-12-21

Rotary fluid pressure device with drive-in-drive valve arrangement

#34
20170321554
2017-11-09

Pneumatic engine and related methods

#35
20170268514
2017-09-21

Scroll device having a pressure plate

#36
20170234130
2017-08-17

Scroll fluid machine with improved reliability and performance of components thereof

#37
20170211891
2017-07-27

Compressor having waste heat recovery with gas recycler

#38
20170074099
2017-03-16

Multi-vane impeller device

#39
20170067303
2017-03-09

Genset for top drive unit

#40
20170058673
2017-03-02

Rotary machine

#41
20170051741
2017-02-23

Scroll type device incorporating spinning or co-rotating scrolls

#42
20170044899
2017-02-16

Motor/engine with rotating pistons

#43
20160376021
2016-12-29

Auxiliary power unit with intercooler

#44
20160363113
2016-12-15

Friction-free Rotary Piston Scissor Action Motor / Hot Air Energy Generator

#45
20160341042
2016-11-24

Rotary engine with cam-guided rotor

#46
20160312611
2016-10-27

Multiple vane roto-dynamic variable displacement kinetic system

#47
20160290222
2016-10-06

Improved-efficiency rotary engine with moveable baffle

#48
20160245163
2016-08-25

Compound engine assembly with cantilevered compressor and turbine

#49
20160201463
2016-07-14

FLUID DEVICE OUTPUT SHAFT WITH COATING

#50
20160194960
2016-07-07

Rotary motor with geared transmission for use of compressible media drive

#51
20160146352
2016-05-26

Methods and systems for sealing rotating equipment such as expanders or compressors

#52
20160138590
2016-05-19

Gerotor apparatus having outer gerotor with strengthening members

#53
20160061039
2016-03-03

ROTARY DEVICE INCLUDING A COUNTERBALANCED SEAL ASSEMBLY

#54
20160061038
2016-03-03

ROTARY DEVICE INCLUDING A COUNTERBALANCED SEAL ASSEMBLY

#55
20150354570
2015-12-10

Displacement type rotary machine with controlling gears

#56
20150354357
2015-12-10

HYDRAULIC GEAR MOTOR, GEAR PUMP AND GEARBOX WITH CONTINUOUSLY VARIABLE PARAMETERS

#57
20150354280
2015-12-10

Progressive cavity based control system

#58
20150315912
2015-11-05

Rotary machine

#59
20150128895
2015-05-14

Rotary engine with rotary power heads

#60
20150053170
2015-02-26

Rotary internal combustion engine

#61
20140308147
2014-10-16

Gerotor apparatus for a quasi-isothermal Brayton cycle engine

#62
20140271309
2014-09-18

Torque-generating steering device

#63
20140186204
2014-07-03

Rotary piston engine including a piston assembly, vehicle including the rotary piston engine and a manufacturing method for the piston assembly

#64
20140134034
2014-05-15

Fluid machine

#65
20140023544
2014-01-23

Freewheel hydraulic motor

#66
20140023543
2014-01-23

Combined motor and brake with rotating brake-release piston

#67
20140020651
2014-01-23

Orbiting planetary gearing system and internal combustion engine employing the same

#68
20130228149
2013-09-05

Rotary Internal Combustion Engine

#69
20130183183
2013-07-18

Rotary engine

#70
20130094986
2013-04-18

Hydraulic transmission device allowing relatively quiet coupling

#71
20130094985
2013-04-18

Rotary piston pump and method for operating a rotary piston pump

#72
20130017114
2013-01-17

Fluid Machine

#73
20120294747
2012-11-22

Cycloid rotor engine

#74
20120160209
2012-06-28

TURBINE HAVING COOPERATING AND COUNTER-ROTATING ROTORS IN A SAME PLANE

#75
20120139260
2012-06-07

Power supply systems

#76
20120019010
2012-01-26

Fluid Machine

#77
20110297117
2011-12-08

Rotary piston internal combustion engine

#78
20110204650
2011-08-25

Power supply systems

#79
20110200476
2011-08-18

Sealing system for gerotor apparatus

#80
20110176948
2011-07-21

Semi-hermetic scroll compressors, vacuum pumps, and expanders

#81
20110174095
2011-07-21

Rotary piston and cylinder devices

#82
20110129375
2011-06-02

WORK EXTRACTION FROM DOWNHOLE PROGRESSIVE CAVITY DEVICES

#83
20110126795
2011-06-02

OLIVE-SHAPED ROTARY ENGINE

#84
20110126794
2011-06-02

WANKEL ROTARY ENGINE

#85
20110100321
2011-05-05

ROTARY POWER DEVICE

#86
20110000460
2011-01-06

Fluid flow in a control arrangement for a rotary piston engine

#87
20100307449
2010-12-09

Rotary piston internal combustion engine

#88
20100300400
2010-12-02

Rotary internal combustion engine

#89
20100269688
2010-10-28

Piston machine

#90
20100266435
2010-10-21

Gerotor apparatus for a quasi-isothermal Brayton cycle engine

#91
20100213786
2010-08-26

Electric machine having rotor and stator configurations

#92
20100178186
2010-07-15

Fluid motor having improved braking effect

#93
20100162706
2010-07-01

Drive for rotating structure

#94
20100003152
2010-01-07

Gerotor apparatus for a quasi-isothermal brayton cycle engine

#95
20100000488
2010-01-07

Conversion mechanism for a pivoting reciprocating engine

#96
20090297385
2009-12-03

Rotary Motor With Intermittent Movements of the Rotors

#97
20090291009
2009-11-26

Rotary piston machine

#98
20090255507
2009-10-15

Piston valve internal combustion engine

#99
20090169364
2009-07-02

Progressive cavity apparatus with transducer and methods of forming and use

#100
20080314350
2008-12-25

Rotary piston internal combustion engine

#101
20080178847
2008-07-31

Free swinging piston heat machine

#102
20080026855
2008-01-31

System and Method for Maintaining Relative Axial Positioning Between Two Rotating Assemblies

#103
20070277765
2007-12-06

Internal combustion engine

#104
20070089701
2007-04-26

Rotary piston machine with an oval rotary piston

#105
20070051087
2007-03-08

Gas turbine engine system

#106
20070006672
2007-01-11

Transmission between rotary devices

#107
20060279155
2006-12-14

Electric machine having a high-torque switched reluctance motor

#108
20060239849
2006-10-26

Gerotor apparatus for a quasi-isothermal Brayton cycle engine

#109
20060213218
2006-09-28

Fluid pump having expansion device and rankine cycle using the same

#110
20060179843
2006-08-17

Fluid machine

#111
20060163970
2006-07-27

Torus geometry motor system

#112
20060032475
2006-02-16

Rotary piston machine with an oval rotary piston guided in an oval chamber

#113
20050260092
2005-11-24

Turbostatic compressor, pump, turbine and hydraulic motor and method of its operation

#114
20050254966
2005-11-17

Pneumatic tool having pressure release device

#115
20050217288
2005-10-06

System utilizing waste heat of internal combustion engine

#116
20050183539
2005-08-25

Eccentric shaft for an internal combustion engine

#117
20050045841
2005-03-03

Transverse disc motor

#118
15911121
2018-10-09

Continuous motion revolving piston engine