F04C 27/004
Radial sealing elements specially adapted for intermeshing-engagement type pumps
Official title: {Radial sealing elements specially adapted for intermeshing-engagement type pumps, e.g. gear pumps}
F04C27/004 (Radial sealing elements specially adapted for intermeshing-engagement type pumps) appears on 26 US grants and 26 published applications in this corpus.
Search patents in F04C- Granted patents
- 26
- Published applications
- 26
- Assignees
- 26
- Inventors
- 73
- Latest grant
- 7 Jul 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1989 | 1 | 0 |
| 1990 | 0 | 0 |
| 1991 | 0 | 0 |
| 1992 | 0 | 0 |
| 1993 | 0 | 0 |
| 1994 | 0 | 0 |
| 1995 | 0 | 0 |
| 1996 | 1 | 0 |
| 1997 | 0 | 0 |
| 1998 | 0 | 0 |
| 1999 | 0 | 0 |
| 2000 | 2 | 0 |
| 2001 | 1 | 0 |
| 2002 | 0 | 0 |
| 2003 | 0 | 0 |
| 2004 | 1 | 0 |
| 2005 | 0 | 0 |
| 2006 | 0 | 0 |
| 2007 | 0 | 0 |
| 2008 | 0 | 1 |
| 2009 | 0 | 0 |
| 2010 | 0 | 4 |
| 2011 | 0 | 2 |
| 2012 | 1 | 1 |
| 2013 | 1 | 1 |
| 2014 | 2 | 2 |
| 2015 | 2 | 3 |
| 2016 | 0 | 2 |
| 2017 | 2 | 1 |
| 2018 | 2 | 1 |
| 2019 | 1 | 0 |
| 2020 | 0 | 2 |
| 2021 | 1 | 2 |
| 2022 | 1 | 0 |
| 2023 | 1 | 1 |
| 2024 | 3 | 2 |
| 2025 | 2 | 1 |
| 2026 | 1 | 0 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Sealing gasket with one or more positioning protrusions7 Jul 2026US 12,674,457 B2Edwards Limited
- 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
- Scroll compressor including a valve plate having a surface pressure enhancement portion protruding toward an injection valve11 Feb 2025US 12,221,960 B2Hanon Systems
- Scroll machine with injection and refrigeration system5 Nov 2024US 12,135,026 B2BITZER Kuehlmaschinenbau GmbH
- Roots pump containing rotors that capture and discharge a foreign substance7 May 2024US 11,976,656 B2Kabushiki Kaisha Toyota Jidoshokki
- Sealing gasket4 Dec 2025US 2025/0369443 A1Edwards Limited
- Scroll compressor14 Mar 2024US 2024/0084800 A1Hanon Systems
- Scroll machine with injection and refrigeration system22 Feb 2024US 2024/0060493 A1BITZER Kuehlmaschinenbau GmbH
- Roots pump28 Sep 2023US 2023/0304497 A1Kabushiki Kaisha Toyota Jidoshokki
- Roots pump4 Nov 2021US 2021/0340979 A1Kabushiki Kaisha Toyota Jidoshokki
Most cited
By later US patents
- Rotary pump with wiper insert38US 6,053,717 A2000
- Fluid rotary apparatus having tapered rotors14US 5,533,887 AMatsushita Electric Industrial Co., Ltd. · 1996
- Rotary piston blower with foamed synthetic material surfaces running along roughened metal surfaces13US 4,846,642 AWankel GmbH · 1989
- Motor-pump unit10US 9,945,377 B2Eckerle Industrie-Elektronik GmbH · 2018
- Double screw rotor assembly having means to automatically adjust the clearance by pressure difference5US 6,257,854 B1Industrial Technology Research Institute · 2001