F04C 15/0023
Axial sealings for working fluid
Official title: {Axial sealings for working fluid}
F04C15/0023 (Axial sealings for working fluid) appears on 311 US grants and 264 published applications in this corpus.
Search patents in F04C- Granted patents
- 311
- Published applications
- 264
- Assignees
- 200
- Inventors
- 605
- Latest grant
- 11 Aug 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 6 | 0 |
| 1977 | 2 | 0 |
| 1978 | 5 | 0 |
| 1979 | 2 | 0 |
| 1980 | 3 | 0 |
| 1981 | 3 | 0 |
| 1982 | 5 | 0 |
| 1983 | 6 | 0 |
| 1984 | 3 | 0 |
| 1985 | 4 | 0 |
| 1986 | 2 | 0 |
| 1987 | 2 | 0 |
| 1988 | 3 | 0 |
| 1989 | 1 | 0 |
| 1990 | 3 | 0 |
| 1991 | 5 | 0 |
| 1992 | 2 | 0 |
| 1993 | 7 | 0 |
| 1994 | 5 | 0 |
| 1995 | 3 | 0 |
| 1996 | 2 | 0 |
| 1997 | 3 | 0 |
| 1998 | 3 | 0 |
| 1999 | 0 | 0 |
| 2000 | 9 | 0 |
| 2001 | 6 | 2 |
| 2002 | 2 | 2 |
| 2003 | 6 | 6 |
| 2004 | 7 | 5 |
| 2005 | 3 | 4 |
| 2006 | 3 | 6 |
| 2007 | 2 | 3 |
| 2008 | 6 | 5 |
| 2009 | 2 | 10 |
| 2010 | 5 | 9 |
| 2011 | 7 | 7 |
| 2012 | 3 | 10 |
| 2013 | 5 | 10 |
| 2014 | 7 | 25 |
| 2015 | 10 | 28 |
| 2016 | 20 | 13 |
| 2017 | 21 | 16 |
| 2018 | 9 | 18 |
| 2019 | 11 | 10 |
| 2020 | 13 | 14 |
| 2021 | 16 | 17 |
| 2022 | 18 | 14 |
| 2023 | 15 | 13 |
| 2024 | 14 | 10 |
| 2025 | 9 | 3 |
| 2026 | 2 | 4 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- In-situ serviceable gear pump11 Aug 2026US 12,704,125 B1Ace Machine Design Inc.
- Rotary pump with rotor bearing cap31 Mar 2026US 12,590,582 B2Unibloc Hygienic Technologies US, LLC
- 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
- Internal gear machine with helical toothing27 May 2025US 12,313,068 B2Hydraulik Nord Technologies GmbH
- 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 seal27 May 2025US 12,313,071 B1Hamilton Sundstrand Corporation
- Hig outer rotor shadow pockets21 May 2026US 2026/0139670 A1Hanon Systems EFP Canada Ltd.
- Journal bearing having wear reduction slots on an end face9 Apr 2026US 2026/0098534 A1
- Adjustable pump for pumping a liquid food product19 Mar 2026US 2026/0078755 A1Tetra Laval Holdings & Finance S. A.
- Vane pump with hydrostatic pressure plates12 Feb 2026US 2026/0043402 A1Eaton Intelligent Power Limited
- Rotary Pump with Rotor Bearing Cap21 Aug 2025US 2025/0264100 A1Unibloc Hygienic Technologies US, LLC
Most cited
By later US patents
- Tandem rotary pump with pressure chamber between two intermediate side plates55US 4,971,535 AToyoda Koki Kabushiki Kaisha · 1990
- Gear pump with low pressure shaft lubrication31US 4,090,820 AKayabakogyokabushikikaisha · 1978
- Gear rotor fuel pump28US 4,596,519 AWalbro Corporation · 1986
- Fluid pump with bearing set having lubrication path28US 5,702,234 AMicropump, Inc. · 1997
- Rotary positive displacement fuel pump with purge port26US 4,697,995 AWalbro Corporation · 1987