F01B 25/02
Regulating or controlling by varying working-fluid admission or exhaust
Official title: Regulating or controlling by varying working-fluid admission or exhaust, e.g. by varying pressure or quantity
F01B25/02 (Regulating or controlling by varying working-fluid admission or exhaust) appears on 78 US grants and 61 published applications in this corpus.
Search patents in F01B- Granted patents
- 78
- Published applications
- 61
- Assignees
- 58
- Inventors
- 133
- Latest grant
- 11 Aug 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 9 | 0 |
| 1977 | 4 | 0 |
| 1978 | 3 | 0 |
| 1979 | 1 | 0 |
| 1980 | 0 | 0 |
| 1981 | 0 | 0 |
| 1982 | 0 | 0 |
| 1983 | 1 | 0 |
| 1984 | 1 | 0 |
| 1985 | 0 | 0 |
| 1986 | 0 | 0 |
| 1987 | 1 | 0 |
| 1988 | 0 | 0 |
| 1989 | 2 | 0 |
| 1990 | 0 | 0 |
| 1991 | 1 | 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 | 1 | 0 |
| 2002 | 1 | 0 |
| 2003 | 0 | 0 |
| 2004 | 0 | 1 |
| 2005 | 0 | 0 |
| 2006 | 0 | 2 |
| 2007 | 0 | 0 |
| 2008 | 0 | 1 |
| 2009 | 1 | 0 |
| 2010 | 0 | 0 |
| 2011 | 0 | 3 |
| 2012 | 0 | 4 |
| 2013 | 2 | 5 |
| 2014 | 4 | 4 |
| 2015 | 4 | 1 |
| 2016 | 3 | 3 |
| 2017 | 3 | 5 |
| 2018 | 3 | 3 |
| 2019 | 5 | 7 |
| 2020 | 5 | 6 |
| 2021 | 2 | 2 |
| 2022 | 4 | 4 |
| 2023 | 2 | 2 |
| 2024 | 6 | 2 |
| 2025 | 5 | 6 |
| 2026 | 3 | 0 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Vacuum engine11 Aug 2026US 12,704,068 B2Energie-Innovation AG
- Power system with carbon dioxide working fluid, generator, and propulsion system10 Mar 2026US 12,571,310 B2
- Steam engine27 Jan 2026US 12,535,005 B2Rd Estate GmbH & Co. KG
- Hydraulic control circuit for a hydraulic motor2 Dec 2025US 12,486,770 B2Danfoss Power Solutions GmbH & Co. OHG
- Heat engine25 Nov 2025US 12,480,479 B2
- Power system with carbon dioxide working fluid, generator, and propulsion system28 Aug 2025US 2025/0270931 A1
- Steam engine10 Jul 2025US 2025/0223905 A1Rd Estate GmbH & Co. KG
- Cylinder/reciprocating-piston device, compressed air engine, and vehicle1 May 2025US 2025/0137372 A1
- Vacuum Engine17 Apr 2025US 2025/0122804 A1Energie-Innovation AG
- Heat Engine6 Mar 2025US 2025/0075684 A1ProEnviroEnergy Inc.
Most cited
By later US patents
- Synchronization cylinder24US 4,409,884 AMcDonnell Douglas Corporation · 1983
- Pressure gas engine14US 3,930,744 AHollymatic Corporation · 1976
- Portable pneumatic nut running tool having air shut-off controls14US 4,120,604 A1978
- Air tool overspeed shutoff device12US 3,930,764 ACooper Industries, Inc. · 1976
- Remote control modification for manually controlled hydraulic systems12US 5,014,596 A1991