F02G 1/044
Having at least two working members
Official title: having at least two working members, e.g. pistons, delivering power output
F02G1/044 (Having at least two working members) appears on 380 US grants and 181 published applications in this corpus.
Search patents in F02G- Granted patents
- 380
- Published applications
- 181
- Assignees
- 146
- Inventors
- 455
- Latest grant
- 11 Aug 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 9 | 0 |
| 1977 | 13 | 0 |
| 1978 | 8 | 0 |
| 1979 | 5 | 0 |
| 1980 | 11 | 0 |
| 1981 | 6 | 0 |
| 1982 | 6 | 0 |
| 1983 | 17 | 0 |
| 1984 | 12 | 0 |
| 1985 | 14 | 0 |
| 1986 | 5 | 0 |
| 1987 | 7 | 0 |
| 1988 | 9 | 0 |
| 1989 | 13 | 0 |
| 1990 | 4 | 0 |
| 1991 | 5 | 0 |
| 1992 | 5 | 0 |
| 1993 | 7 | 0 |
| 1994 | 11 | 0 |
| 1995 | 12 | 0 |
| 1996 | 7 | 0 |
| 1997 | 8 | 0 |
| 1998 | 9 | 0 |
| 1999 | 4 | 0 |
| 2000 | 6 | 0 |
| 2001 | 18 | 4 |
| 2002 | 6 | 2 |
| 2003 | 3 | 5 |
| 2004 | 4 | 7 |
| 2005 | 7 | 5 |
| 2006 | 1 | 1 |
| 2007 | 2 | 4 |
| 2008 | 1 | 3 |
| 2009 | 1 | 2 |
| 2010 | 3 | 10 |
| 2011 | 2 | 10 |
| 2012 | 3 | 3 |
| 2013 | 9 | 4 |
| 2014 | 6 | 5 |
| 2015 | 2 | 13 |
| 2016 | 5 | 7 |
| 2017 | 11 | 9 |
| 2018 | 11 | 14 |
| 2019 | 8 | 5 |
| 2020 | 9 | 19 |
| 2021 | 13 | 5 |
| 2022 | 11 | 15 |
| 2023 | 8 | 10 |
| 2024 | 13 | 8 |
| 2025 | 7 | 6 |
| 2026 | 3 | 5 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Double crankshaft reciprocating engine11 Aug 2026US 12,704,089 B2
- Energy harvesting heat engine28 Jul 2026US 12,692,821 B2Synergy Power LLC
- Single cylinder internally heated stirling engine24 Mar 2026US 12,584,454 B2
- 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
- Manifold assembly for a closed-cycle engine13 Aug 2026US 2026/0235090 A1Hyliion Holdings Corp.
- Regenerator construction and structural design for enhanced performance in vuilleumier heat pumps16 Jul 2026US 2026/0201848 A1
- Pneumatically Actuated Energy Generator19 Mar 2026US 2026/0078714 A1
- Dual-Head Opposing-Piston Free-Piston Stirling Engine Design12 Mar 2026US 2026/0071588 A1Exowatt, Inc.
- Double crankshaft reciprocating engine12 Feb 2026US 2026/0043345 A1
Most cited
By later US patents
- Micro miniature refrigerators142US 4,392,362 AThe Board of Trustees of the Leland Stanford Junior University · 1983
- Micromachined rate and acceleration sensor127US 5,241,861 ASundstrand Corporation · 1993
- Apparatus and process for pressure swing adsorption separation100US 4,801,308 A1989
- Heat engine and heat pump94US 5,934,076 ANational Power PLC · 1999
- Method and apparatus for gas separation and synthesis77US 4,702,903 A1987