F04C 2240/54
Hydrostatic or hydrodynamic bearing assemblies specially adapted for rotary positive displacement pumps
Official title: Hydrostatic or hydrodynamic bearing assemblies specially adapted for rotary positive displacement pumps or compressors
F04C2240/54 (Hydrostatic or hydrodynamic bearing assemblies specially adapted for rotary positive displacement pumps) appears on 112 US grants and 125 published applications in this corpus.
Search patents in F04C- Granted patents
- 112
- Published applications
- 125
- Assignees
- 84
- Inventors
- 248
- Latest grant
- 10 Feb 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 1 | 0 |
| 1977 | 0 | 0 |
| 1978 | 0 | 0 |
| 1979 | 0 | 0 |
| 1980 | 0 | 0 |
| 1981 | 0 | 0 |
| 1982 | 0 | 0 |
| 1983 | 0 | 0 |
| 1984 | 0 | 0 |
| 1985 | 0 | 0 |
| 1986 | 1 | 0 |
| 1987 | 0 | 0 |
| 1988 | 0 | 0 |
| 1989 | 0 | 0 |
| 1990 | 0 | 0 |
| 1991 | 0 | 0 |
| 1992 | 1 | 0 |
| 1993 | 0 | 0 |
| 1994 | 0 | 0 |
| 1995 | 0 | 0 |
| 1996 | 0 | 0 |
| 1997 | 0 | 0 |
| 1998 | 0 | 0 |
| 1999 | 0 | 0 |
| 2000 | 0 | 0 |
| 2001 | 1 | 0 |
| 2002 | 0 | 1 |
| 2003 | 1 | 0 |
| 2004 | 1 | 0 |
| 2005 | 0 | 0 |
| 2006 | 0 | 0 |
| 2007 | 0 | 0 |
| 2008 | 0 | 3 |
| 2009 | 0 | 1 |
| 2010 | 0 | 0 |
| 2011 | 4 | 3 |
| 2012 | 1 | 2 |
| 2013 | 1 | 5 |
| 2014 | 1 | 8 |
| 2015 | 3 | 11 |
| 2016 | 9 | 9 |
| 2017 | 8 | 3 |
| 2018 | 7 | 14 |
| 2019 | 8 | 10 |
| 2020 | 7 | 7 |
| 2021 | 7 | 7 |
| 2022 | 9 | 7 |
| 2023 | 8 | 19 |
| 2024 | 20 | 9 |
| 2025 | 12 | 4 |
| 2026 | 1 | 2 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Oil pump for a motor vehicle10 Feb 2026US 12,546,312 B2Brose Fahrzeugteile SE & Co. Kommanditgesellschaft, Würzburg
- Hydraulic gear pump with hydrostatic shaft bearing and isolated case drain and method of operating a hydraulic gear pump11 Nov 2025US 12,467,455 B2Parker-Hannifin Corporation
- Fluid machine28 Oct 2025US 12,456,898 B2Kabushiki Kaisha Toyota Jidoshokki
- Sliding component2 Sep 2025US 12,404,935 B2Eagle Industry Co., Ltd.
- Gear pump with intermeshing gearwheels enclosed by housing with bearing journals arranged on shaft axes12 Aug 2025US 12,385,483 B2Maag Pump Systems AG
- Multiphase pump of the screw spindle pump type1 Oct 2026US 2026/0298229 A1Leistritz Pumpen GmbH
- Journal bearing having wear reduction slots on an end face9 Apr 2026US 2026/0098534 A1
- Machine for expanding or compressing compressible media2 Oct 2025US 2025/0305497 A1BITZER Kuehlmaschinenbau GmbH
- Oil pump for a motor vehicle20 Mar 2025US 2025/0092872 A1Brose Fahrzeugteile SE & Co. Kommanditgesellschaft, Würzburg
- Rotary compressor30 Jan 2025US 2025/0035113 A1LG Electronics Inc.
Most cited
By later US patents
- Gear pump cavitation reduction18US 7,878,781 B2Hamilton Sundstrand Corporation · 2011
- Vane type rotary machine15US 6,629,829 B1Ebara Corporation · 2003
- Oil-free screw rotor apparatus14US 6,302,667 B1Svenska Rotor Maskiner AB · 2001
- Scroll compressor having grooved thrust bearing14US 7,878,777 B2Denso Corporation · 2011
- Synthetic resin bearing and scroll compressor having the same12US 9,217,433 B2LG Electronics Inc. · 2015