F01C 9/00
Oscillating-piston machines or engines
F01C9/00 (Oscillating-piston machines or engines) appears on 253 US grants and 165 published applications in this corpus.
Search patents in F01C- Granted patents
- 253
- Published applications
- 165
- Assignees
- 86
- Inventors
- 279
- Latest grant
- 19 May 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 16 | 0 |
| 1977 | 14 | 0 |
| 1978 | 5 | 0 |
| 1979 | 1 | 0 |
| 1980 | 3 | 0 |
| 1981 | 2 | 0 |
| 1982 | 4 | 0 |
| 1983 | 1 | 0 |
| 1984 | 2 | 0 |
| 1985 | 3 | 0 |
| 1986 | 3 | 0 |
| 1987 | 0 | 0 |
| 1988 | 0 | 0 |
| 1989 | 6 | 0 |
| 1990 | 4 | 0 |
| 1991 | 3 | 0 |
| 1992 | 9 | 0 |
| 1993 | 4 | 0 |
| 1994 | 5 | 0 |
| 1995 | 4 | 0 |
| 1996 | 4 | 0 |
| 1997 | 4 | 0 |
| 1998 | 3 | 0 |
| 1999 | 4 | 0 |
| 2000 | 3 | 0 |
| 2001 | 9 | 4 |
| 2002 | 7 | 2 |
| 2003 | 2 | 3 |
| 2004 | 1 | 2 |
| 2005 | 3 | 7 |
| 2006 | 1 | 12 |
| 2007 | 7 | 8 |
| 2008 | 9 | 13 |
| 2009 | 3 | 7 |
| 2010 | 9 | 14 |
| 2011 | 5 | 9 |
| 2012 | 9 | 8 |
| 2013 | 4 | 12 |
| 2014 | 10 | 7 |
| 2015 | 15 | 15 |
| 2016 | 8 | 5 |
| 2017 | 8 | 6 |
| 2018 | 4 | 7 |
| 2019 | 12 | 7 |
| 2020 | 4 | 8 |
| 2021 | 5 | 4 |
| 2022 | 6 | 1 |
| 2023 | 2 | 1 |
| 2024 | 0 | 0 |
| 2025 | 1 | 1 |
| 2026 | 2 | 2 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Tangential internal combustion engine19 May 2026US 12,631,137 B2Fnf Innovation Sh.P.K.
- Self-cooled rotary engine and pump12 May 2026US 12,624,656 B1
- Integrated energy generating damper1 Apr 2025US 12,264,656 B2ClearMotion, Inc.
- Piston machine, modular construction system for a piston machine, and method for producing a piston machine26 Dec 2023US 11,852,017 B2RapSon GmbH
- Multi-chamber compressor of mechanical vapor re-compression and water treatment methods4 Jul 2023US 11,691,895 B2
- Volumetric heat engine with piston-pendulum30 Jul 2026US 2026/0218647 A1
- Tangential internal combustion engine26 Feb 2026US 2026/0055723 A1Fnf Innovation Sh.P.K.
- Rotational engine18 Sep 2025US 2025/0290419 A1Duplicent, LLC
- Integrated energy generating damper10 Aug 2023US 2023/0250811 A1ClearMotion, Inc.
- Piston machine, modular construction system for a piston machine, and method for producing a piston machine3 Feb 2022US 2022/0034226 A1RapSon GmbH
Most cited
By later US patents
- Integrated energy generating damper39US 8,841,786 B2Levant Power Corporation · 2014
- Actuator for transfer of forward and backward rotational movement31US 5,495,791 A1996
- Liquid sealed vane oscillators26US 5,115,157 ATechnion Research & Development Foundation Limited · 1992
- Rotary actuator25US 4,628,797 AMenasco Inc. · 1986
- Internal combustion engine driven hydraulic pump23US 6,270,322 B12001