F04C 7/00
Rotary-piston machines or pumps with fluid ring or the like
Official title: Rotary-piston machines or pumps with fluid ring or the like (such pumps specially adapted for elastic fluids F04C19/00)
F04C7/00 (Rotary-piston machines or pumps with fluid ring or the like) appears on 16 US grants and 20 published applications in this corpus.
Search patents in F04C- Granted patents
- 16
- Published applications
- 20
- Assignees
- 15
- Inventors
- 36
- Latest grant
- 14 Oct 2025
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1985 | 1 | 0 |
| 1986 | 0 | 0 |
| 1987 | 0 | 0 |
| 1988 | 0 | 0 |
| 1989 | 1 | 0 |
| 1990 | 0 | 0 |
| 1991 | 0 | 0 |
| 1992 | 0 | 0 |
| 1993 | 0 | 0 |
| 1994 | 1 | 0 |
| 1995 | 0 | 0 |
| 1996 | 0 | 0 |
| 1997 | 0 | 0 |
| 1998 | 0 | 0 |
| 1999 | 0 | 0 |
| 2000 | 0 | 0 |
| 2001 | 0 | 0 |
| 2002 | 0 | 0 |
| 2003 | 0 | 0 |
| 2004 | 0 | 1 |
| 2005 | 0 | 0 |
| 2006 | 1 | 0 |
| 2007 | 0 | 0 |
| 2008 | 0 | 0 |
| 2009 | 0 | 1 |
| 2010 | 0 | 0 |
| 2011 | 0 | 0 |
| 2012 | 0 | 0 |
| 2013 | 0 | 1 |
| 2014 | 0 | 2 |
| 2015 | 3 | 3 |
| 2016 | 0 | 3 |
| 2017 | 1 | 0 |
| 2018 | 3 | 1 |
| 2019 | 0 | 1 |
| 2020 | 0 | 0 |
| 2021 | 1 | 3 |
| 2022 | 0 | 1 |
| 2023 | 2 | 0 |
| 2024 | 0 | 2 |
| 2025 | 2 | 1 |
By publication year. Applications have been published since 2001.
Recent patents
- Turbomachine provided with a magnetic drive pump14 Oct 2025US 12,442,385 B2Safran Helicopter Engines
- Electronic positive displacement fluid pump with motor cooling and air purging1 Apr 2025US 12,264,673 B2Phinia Jersey Holdings LLC
- Liquid ring pump control28 Nov 2023US 11,828,285 B2Edwards Technologies Vacuum Engineering (Qingdao) Company Limited
- Pump assemblies configured for drive and pump end interchangeability28 Mar 2023US 11,614,085 B2Rotary Manufacturing, LLC
- Ring section pump having intermediate tie rod combination14 Sep 2021US 11,118,584 B2ITT Manufacturing Enterprises, Inc.
- Two-Stage Pump27 Nov 2025US 2025/0361864 A1Truma Gerätetechnik GmbH & Co. KG
- Electronic positive displacement fluid pump with motor cooling and air purging3 Oct 2024US 2024/0328415 A1Delphi Technologies IP Limited
- Turbomachine provided with a magnetic drive pump2 May 2024US 2024/0141911 A1Safran Helicopter Engines
- Turbomachine provided with an electromagnetic pump with axial magnetic flux24 Nov 2022US 2022/0372973 A1Safran Helicopter Engines
- A liquid ring pump manifold2 Dec 2021US 2021/0372402 A1Edwards Technologies Vacuum Engineering (Qingdao) Company Limited
Most cited
By later US patents
- Vacuum drainage system17US 5,344,085 A1994
- Ring section pump having intermediate tie rod combination13US 11,118,584 B2ITT Manufacturing Enterprises, Inc. · 2021
- Electro-rheological transducer7US 4,493,615 ANational Research Development Corporation · 1985
- Loop pump4US 4,820,134 A1989
- Liquid seal pump of the helical screw type2US 7,029,231 B2Jets AS · 2006