F04C 2/12

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Description

Class  F04C : ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS


Subclass 2/12: Rotary-piston machines or pumps (with non-parallel axes of co-operating members F04C 3/00; with the working-chamber walls at least partly resiliently deformable F04C 5/00; with fluid ring or the like F04C 7/00; rotary-piston pumps specially adapted for elastic fluids F04C 18/00, F04C 19/00; rotary-piston machines or pumps in which the working-fluid is exclusively displaced by, or exclusively displaces, one or more reciprocating pistons F04B) of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type

Recent Patents

Patent #TitleFiling DateIssue DatePatent Owner
12264673 Electronic positive displacement fluid pump with motor cooling and air purgingMar 30, 23Apr 01, 25PHINIA JERSEY HOLDINGS LLC
12188474 Roots pumpFeb 20, 24Jan 07, 25Kabushiki Kaisha Toyota Jidoshokki
12180960 Rotary positive displacement deviceSep 29, 23Dec 31, 24Spherical Rotors Inc.
12140142 Rotary positive displacement pumpJan 19, 22Nov 12, 24Alfa Laval Corporate AB
12060882 Rotary positive displacement pumpMar 26, 21Aug 13, 24Alfa Laval Corporate AB
12025131 Torque transfer gear pumpAug 08, 22Jul 02, 24Deere & Company
12018681 Oil box device of a roots vacuum pump with a crossed cooling water tube setMay 16, 23Jun 25, 24ELIVAC Inc.; ELIVAC CO., LTD; RAYMOND Z. SHAW;
11976659 Positive displacement pump with pressure reliefOct 26, 22May 07, 24Not available
11828287 Screw spindle pumpDec 09, 22Nov 28, 23LEISTRITZ PUMPEN GMBH
11794134 Multiphase separation and pressure letdown methodDec 19, 19Oct 24, 23Deep Reach Technology Inc.
11771003 Transfer assembly for attachment to a front portion of an agricultural vehicle and a method of useSep 25, 20Oct 03, 23Not available
11754070 Pump device, especially for mobile means of transportJan 13, 20Sep 12, 23Bricks Group, LLC
11668304 Low coefficient of expansion rotors for vacuum boostersMar 01, 21Jun 06, 23GARDNER DENVER, INC.
11499552 Fluid working systemsMay 06, 16Nov 15, 22DANFOSS POWER SOLUTIONS GMBH & CO OHG
11460024 Method of monitoring a volume index valve of a compressor and diagnostic systemAug 01, 17Oct 04, 22Carrier Corporation
11408330 Method of operating a four stroke internal combustion engine systemJun 29, 18Aug 09, 22Volvo Truck Corporation
11401936 Motor-driven roots pump with smooth activation in low-temperature environmentJul 16, 20Aug 02, 22KABUSHIKI KAISHA TOYOTA JIDOSHOKKI
11353021 Roots pump having a seal member with first and second projectionsApr 27, 21Jun 07, 22KABUSHIKI KAISHA TOYOTA JIDOSHOKKI; NOK Corporation;
11353019 Rotary pump with rotor bearing ringAug 27, 20Jun 07, 22The Bricks Groupe, LLC
11320036 Transmission structure of motor connection of roots pumpSep 17, 20May 03, 22OVG VACUUM TECHNOLOGY (SHANGHAI) CO., LTD

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Recent Publications

Publication #TitleFiling DatePub DatePatent Owner
2025/0003,405 Stator for a Pump and Method for Producing a Stator for a PumpJun 21, 24Jan 02, 25Not available
2024/0352,930 POSITIVE DISPLACEMENT PUMP WITH PRESSURE RELIEFApr 29, 24Oct 24, 24Not available
2024/0328,417 VACUUM SYSTEM HAVING CONDENSER AND ROOT VACUUM PUMP SETJun 06, 24Oct 03, 24ELIVAC CO., LTD.; ELIVAC INC.;
2024/0060,489 PUMP FOR CONVEYING A FLUIDAug 16, 23Feb 22, 24VOGELSANG GMBH & CO. KG
2023/0287,884 GEROTOR AND PUMP APPARATUS HAVING A GEROTOR DEVICEMar 08, 23Sep 14, 23Not available
2022/0252,066 Split Power Gerotor PumpFeb 08, 21Aug 11, 22Schaeffler Technologies AG & Co. KG
2022/0243,727 ROTOR AND PUMPJun 03, 20Aug 04, 22Not available
2022/0025,883 ROTARY LOBE PUMP WITH INTERNAL BEARINGDec 13, 19Jan 27, 22VOGELSANG GMBH & CO. KG
2021/0381,505 METHOD OF MONITORING A VOLUME INDEX VALVE OF A COMPRESSOR AND DIAGNOSTIC SYSTEMAug 01, 17Dec 09, 21Not available
2021/0372,399 HIGH PRESSURE PUMPJul 20, 18Dec 02, 21Not available
2021/0332,817 POSITIVE DISPLACEMENT PUMP WITH PRESSURE RELIEFJul 08, 21Oct 28, 21Not available
2020/0208,629 PUMP ASSEMBLY HAVING TWO PUMPS PROVIDED IN A SINGLE HOUSINGDec 20, 19Jul 02, 20Not available
2020/0116,148 TWIN ROTOR DEVICES WITH INTERNAL CLEARANCES REDUCED BY A COATING AFTER ASSEMBLY, A COATING SYSTEM, AND METHODSDec 11, 19Apr 16, 20Not available
2020/0032,790 Positive Displacement Pump With Shaft-Mounted SleeveJul 25, 18Jan 30, 20Not available
2019/0203,708 HOLLOW ROTOR LOBE AND CONTROL OF TIP DEFLECTIONJun 20, 17Jul 04, 19EATON INTELLIGENT POWER LIMITED
2014/0099,226 SIMPLIFIED ROOTS-TYPE BLOWERDec 02, 13Apr 10, 14Not available

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Patents Issued To Date - By Filing Year

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