F02G
Hot gas or combustion-product positive-displacement engine plants
Official title: HOT GAS OR COMBUSTION-PRODUCT POSITIVE-DISPLACEMENT ENGINE PLANTS (steam engine plants, special vapour plants, plants operating on either hot gas or combustion-product gases together with other fluid F01K; gas-turbine plants F02C; jet-propulsion plants F02K); USE OF WASTE HEAT OF COMBUSTION ENGINES; NOT OTHERWISE PROVIDED FOR
F02G (Hot gas or combustion-product positive-displacement engine plants) appears on 3,065 US grants and 2,116 published applications in this corpus.
Search patents in F02G- Granted patents
- 3,065
- Published applications
- 2,116
- Assignees
- 1,052
- Inventors
- 4,445
- Latest grant
- 15 Sep 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 70 | 0 |
| 1977 | 59 | 0 |
| 1978 | 51 | 0 |
| 1979 | 34 | 0 |
| 1980 | 56 | 0 |
| 1981 | 48 | 0 |
| 1982 | 50 | 0 |
| 1983 | 71 | 0 |
| 1984 | 66 | 0 |
| 1985 | 55 | 0 |
| 1986 | 49 | 0 |
| 1987 | 73 | 0 |
| 1988 | 57 | 0 |
| 1989 | 65 | 0 |
| 1990 | 47 | 0 |
| 1991 | 41 | 0 |
| 1992 | 43 | 0 |
| 1993 | 35 | 0 |
| 1994 | 45 | 0 |
| 1995 | 48 | 0 |
| 1996 | 44 | 0 |
| 1997 | 37 | 0 |
| 1998 | 52 | 0 |
| 1999 | 45 | 0 |
| 2000 | 55 | 0 |
| 2001 | 72 | 19 |
| 2002 | 78 | 66 |
| 2003 | 77 | 79 |
| 2004 | 76 | 99 |
| 2005 | 62 | 84 |
| 2006 | 74 | 71 |
| 2007 | 43 | 66 |
| 2008 | 39 | 66 |
| 2009 | 33 | 67 |
| 2010 | 43 | 100 |
| 2011 | 38 | 105 |
| 2012 | 40 | 91 |
| 2013 | 74 | 143 |
| 2014 | 93 | 102 |
| 2015 | 95 | 134 |
| 2016 | 84 | 105 |
| 2017 | 106 | 114 |
| 2018 | 99 | 102 |
| 2019 | 84 | 109 |
| 2020 | 108 | 120 |
| 2021 | 103 | 52 |
| 2022 | 83 | 67 |
| 2023 | 52 | 54 |
| 2024 | 53 | 39 |
| 2025 | 38 | 39 |
| 2026 | 22 | 23 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Main groups
Granted patents with any code in the group
- F02G 1/00Hot gas positive-displacement engine plants1,770
- F02G 5/00Profiting from waste heat of combustion engines, not otherwise provided for966
- F02G 2243/00Stirling type engines having closed regenerative thermodynamic cycles with flow controlled byIndexing code462
- F02G 2254/00Heat inputsIndexing code372
- F02G 2270/00Constructional featuresIndexing code354
- F02G 2244/00Machines having two pistonsIndexing code327
- F02G 2250/00Special cycles or special enginesIndexing code264
- F02G 3/00Combustion-product positive-displacement engine plants218
All 19 main groupsShow fewer
- F02G 2258/00Materials usedIndexing code174
- F02G 2253/00SealsIndexing code169
- F02G 2280/00Output deliveryIndexing code154
- F02G 2260/00Recuperating heat from exhaust gases of combustion engines and heat from coolingIndexing code117
- F02G 2275/00ControlsIndexing code100
- F02G 2255/00Heater tubesIndexing code88
- F02G 2256/00CoolersIndexing code76
- F02G 2257/00RegeneratorsIndexing code62
- F02G 2242/00Ericsson-type engines having open regenerative cycles controlled by valvesIndexing code35
- F02G 2290/00Engines characterised by the use of a particular power transfer mediumIndexing code11
- F02G 2262/00Recuperating heat from exhaust gases of combustion engines and heat from lubricationIndexing code10
Recent patents
- Steam supply system and steam supply method15 Sep 2026US 12,735,998 B2Mitsubishi Heavy Industries, Ltd.
- Power generation system18 Aug 2026US 12,710,018 B2Landmark Technology Corporation
- 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
- Comprehensive energy supply system with hydrogen production and prediction function and integrated with hydrogen energy storage by residual flue gas of gas engine24 Sep 2026US 2026/0286916 A1The Architectural Design & Research Institute of Zhejiang University Co., Ltd.
- 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
Most cited
By later US patents
- Electroactive polymer devices1,577US 6,545,384 B1SRI International · 2003
- Electroactive polymer electrodes1,515US 6,583,533 B2SRI International · 2003
- Hydrocarbon combustion power generation system with CO2 sequestration337US 6,389,814 B1Clean Energy Systems, Inc. · 2002
- Power plant utilizing compressed air energy storage and saturation333US 5,491,969 AElectric Power Research Institute, Inc. · 1996
- Microcomponent chemical process sheet architecture299US 5,811,062 ABattelle Memorial Institute · 1998