F02G 2244/50
Double acting piston machines
F02G2244/50 (Double acting piston machines) appears on 222 US grants and 74 published applications in this corpus.
Search patents in F02G- Granted patents
- 222
- Published applications
- 74
- Assignees
- 73
- Inventors
- 254
- Latest grant
- 28 Jul 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 4 | 0 |
| 1977 | 12 | 0 |
| 1978 | 7 | 0 |
| 1979 | 4 | 0 |
| 1980 | 11 | 0 |
| 1981 | 9 | 0 |
| 1982 | 6 | 0 |
| 1983 | 16 | 0 |
| 1984 | 17 | 0 |
| 1985 | 11 | 0 |
| 1986 | 5 | 0 |
| 1987 | 4 | 0 |
| 1988 | 4 | 0 |
| 1989 | 5 | 0 |
| 1990 | 6 | 0 |
| 1991 | 2 | 0 |
| 1992 | 5 | 0 |
| 1993 | 3 | 0 |
| 1994 | 4 | 0 |
| 1995 | 5 | 0 |
| 1996 | 3 | 0 |
| 1997 | 5 | 0 |
| 1998 | 10 | 0 |
| 1999 | 2 | 0 |
| 2000 | 1 | 0 |
| 2001 | 2 | 0 |
| 2002 | 1 | 5 |
| 2003 | 4 | 3 |
| 2004 | 1 | 1 |
| 2005 | 2 | 0 |
| 2006 | 2 | 1 |
| 2007 | 1 | 2 |
| 2008 | 0 | 1 |
| 2009 | 1 | 2 |
| 2010 | 2 | 2 |
| 2011 | 0 | 5 |
| 2012 | 1 | 1 |
| 2013 | 1 | 3 |
| 2014 | 3 | 2 |
| 2015 | 1 | 4 |
| 2016 | 2 | 2 |
| 2017 | 6 | 2 |
| 2018 | 3 | 4 |
| 2019 | 1 | 2 |
| 2020 | 5 | 13 |
| 2021 | 7 | 3 |
| 2022 | 3 | 5 |
| 2023 | 5 | 4 |
| 2024 | 4 | 3 |
| 2025 | 2 | 2 |
| 2026 | 1 | 2 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Energy harvesting heat engine28 Jul 2026US 12,692,821 B2Synergy Power LLC
- Stirling engine with at least four piston assemblies7 Oct 2025US 12,435,681 B2Regensys Ltd
- System and apparatus for energy conversion18 Feb 2025US 12,228,094 B2Hyliion Holdings Corp.
- Engine apparatus and method for operation29 Oct 2024US 12,129,812 B2Hyliion Holdings Corp.
- Engine apparatus and method for operation4 Jun 2024US 12,000,356 B2Hyliion Holdings Corp.
- Manifold assembly for a closed-cycle engine13 Aug 2026US 2026/0235090 A1Hyliion Holdings Corp.
- Pneumatically Actuated Energy Generator19 Mar 2026US 2026/0078714 A1
- Slow actuation mechanoliquid piston heat pump29 May 2025US 2025/0172107 A1
- An alpha type stirling engine6 Feb 2025US 2025/0043746 A1EnergyIntel Services Ltd.
- Energy harvesting heat engine19 Dec 2024US 2024/0418136 A1Synergy Power LLC
Most cited
By later US patents
- Hybrid electric propulsion system164US 5,172,784 A1992
- Extraction and concentration of a gas component117US 5,082,473 A1992
- Fluid pressure power plant with double-acting piston105US 3,991,574 A1976
- Pressure swing adsorption for concentration of a gas component102US 4,968,329 A1990
- Thermally coupled pressure swing adsorption101US 5,256,172 A1993