F02G 1/04
Hot gas positive-displacement engine plants: of closed-cycle type
Official title: of closed-cycle type
F02G1/04 (Hot gas positive-displacement engine plants: of closed-cycle type) appears on 1,598 US grants and 932 published applications in this corpus.
Search patents in F02G- Granted patents
- 1,598
- Published applications
- 932
- Assignees
- 544
- Inventors
- 1,963
- Latest grant
- 11 Aug 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 47 | 0 |
| 1977 | 39 | 0 |
| 1978 | 32 | 0 |
| 1979 | 26 | 0 |
| 1980 | 36 | 0 |
| 1981 | 30 | 0 |
| 1982 | 31 | 0 |
| 1983 | 56 | 0 |
| 1984 | 47 | 0 |
| 1985 | 38 | 0 |
| 1986 | 33 | 0 |
| 1987 | 46 | 0 |
| 1988 | 33 | 0 |
| 1989 | 37 | 0 |
| 1990 | 28 | 0 |
| 1991 | 29 | 0 |
| 1992 | 33 | 0 |
| 1993 | 23 | 0 |
| 1994 | 23 | 0 |
| 1995 | 33 | 0 |
| 1996 | 19 | 0 |
| 1997 | 20 | 0 |
| 1998 | 23 | 0 |
| 1999 | 19 | 0 |
| 2000 | 24 | 0 |
| 2001 | 36 | 11 |
| 2002 | 39 | 33 |
| 2003 | 41 | 41 |
| 2004 | 38 | 54 |
| 2005 | 38 | 53 |
| 2006 | 35 | 34 |
| 2007 | 27 | 26 |
| 2008 | 17 | 43 |
| 2009 | 19 | 29 |
| 2010 | 28 | 50 |
| 2011 | 23 | 55 |
| 2012 | 22 | 39 |
| 2013 | 38 | 53 |
| 2014 | 40 | 40 |
| 2015 | 27 | 32 |
| 2016 | 29 | 44 |
| 2017 | 37 | 32 |
| 2018 | 38 | 40 |
| 2019 | 26 | 30 |
| 2020 | 41 | 46 |
| 2021 | 41 | 25 |
| 2022 | 34 | 36 |
| 2023 | 20 | 26 |
| 2024 | 27 | 22 |
| 2025 | 20 | 21 |
| 2026 | 12 | 17 |
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
- Internally heated engine28 Jul 2026US 12,692,822 B2Heneng (Hainan) Technology Co., Ltd
- Maximum delivery adiabatic hot-air engine9 Jun 2026US 12,650,097 B1
- System for supplying electricity, heat, and water using a Stirling engine powered by sustainable energy sources26 May 2026US 12,638,196 B2
- Mobile oil stream energy recovery system27 Aug 2026US 2026/0251079 A1Gradient Geothermal Inc.
- Manifold assembly for a closed-cycle engine13 Aug 2026US 2026/0235090 A1Hyliion Holdings Corp.
- Volumetric heat engine with piston-pendulum30 Jul 2026US 2026/0218647 A1
- Regenerator construction and structural design for enhanced performance in vuilleumier heat pumps16 Jul 2026US 2026/0201848 A1
- Method of manufacturing heat accumulator, and heat accumulator16 Jul 2026US 2026/0202140 A1Central Motor Wheel Co., Ltd.
Most cited
By later US patents
- Electroactive polymer devices1,577US 6,545,384 B1SRI International · 2003
- Hydrocarbon combustion power generation system with CO2 sequestration337US 6,389,814 B1Clean Energy Systems, Inc. · 2002
- Microcomponent chemical process sheet architecture299US 5,811,062 ABattelle Memorial Institute · 1998
- Method for generating electrical power from fuel cell powered cars parked in a conventional parking lot252US 5,767,584 AGRoW International Corp. · 1998
- Hydrocarbon combustion power generation system with CO2 sequestration216US 7,043,920 B2Clean Energy Systems, Inc. · 2006