F02G 2244/00
Machines having two pistons
F02G2244/00 (Machines having two pistons) appears on 327 US grants and 126 published applications in this corpus.
Search patents in F02G- Granted patents
- 327
- Published applications
- 126
- Assignees
- 107
- Inventors
- 380
- Latest grant
- 28 Jul 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 8 | 0 |
| 1977 | 14 | 0 |
| 1978 | 10 | 0 |
| 1979 | 7 | 0 |
| 1980 | 12 | 0 |
| 1981 | 9 | 0 |
| 1982 | 6 | 0 |
| 1983 | 22 | 0 |
| 1984 | 17 | 0 |
| 1985 | 15 | 0 |
| 1986 | 7 | 0 |
| 1987 | 7 | 0 |
| 1988 | 9 | 0 |
| 1989 | 9 | 0 |
| 1990 | 6 | 0 |
| 1991 | 5 | 0 |
| 1992 | 11 | 0 |
| 1993 | 4 | 0 |
| 1994 | 8 | 0 |
| 1995 | 8 | 0 |
| 1996 | 4 | 0 |
| 1997 | 6 | 0 |
| 1998 | 11 | 0 |
| 1999 | 2 | 0 |
| 2000 | 3 | 0 |
| 2001 | 3 | 1 |
| 2002 | 2 | 8 |
| 2003 | 7 | 5 |
| 2004 | 4 | 4 |
| 2005 | 4 | 2 |
| 2006 | 3 | 3 |
| 2007 | 3 | 3 |
| 2008 | 0 | 3 |
| 2009 | 2 | 2 |
| 2010 | 4 | 6 |
| 2011 | 1 | 10 |
| 2012 | 1 | 2 |
| 2013 | 3 | 4 |
| 2014 | 8 | 4 |
| 2015 | 2 | 5 |
| 2016 | 2 | 3 |
| 2017 | 8 | 6 |
| 2018 | 5 | 7 |
| 2019 | 3 | 3 |
| 2020 | 6 | 14 |
| 2021 | 11 | 4 |
| 2022 | 6 | 8 |
| 2023 | 6 | 7 |
| 2024 | 7 | 5 |
| 2025 | 5 | 4 |
| 2026 | 1 | 3 |
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
- Method and apparatus for a rotary thermodynamic cycle with substantially isobaric fluid admission15 Jul 2025US 12,359,641 B2Fetu Limited
- Alpha stirling engine8 Jul 2025US 12,352,223 B2EnergyIntel Services Ltd.
- System and apparatus for energy conversion18 Feb 2025US 12,228,094 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
- Dual-Head Opposing-Piston Free-Piston Stirling Engine Design12 Mar 2026US 2026/0071588 A1Exowatt, Inc.
- Slow actuation mechanoliquid piston heat pump29 May 2025US 2025/0172107 A1
- Stirling cycle machine27 Feb 2025US 2025/0067230 A1DEKA Products Limited Partnership
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