F02G 2250/00
Special cycles or special engines
F02G2250/00 (Special cycles or special engines) appears on 264 US grants and 69 published applications in this corpus.
Search patents in F02G- Granted patents
- 264
- Published applications
- 69
- Assignees
- 100
- Inventors
- 322
- Latest grant
- 19 Aug 2025
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 8 | 0 |
| 1977 | 5 | 0 |
| 1978 | 4 | 0 |
| 1979 | 2 | 0 |
| 1980 | 5 | 0 |
| 1981 | 6 | 0 |
| 1982 | 10 | 0 |
| 1983 | 9 | 0 |
| 1984 | 6 | 0 |
| 1985 | 9 | 0 |
| 1986 | 3 | 0 |
| 1987 | 14 | 0 |
| 1988 | 8 | 0 |
| 1989 | 14 | 0 |
| 1990 | 2 | 0 |
| 1991 | 4 | 0 |
| 1992 | 1 | 0 |
| 1993 | 8 | 0 |
| 1994 | 9 | 0 |
| 1995 | 10 | 0 |
| 1996 | 14 | 0 |
| 1997 | 8 | 0 |
| 1998 | 7 | 0 |
| 1999 | 7 | 0 |
| 2000 | 8 | 0 |
| 2001 | 9 | 1 |
| 2002 | 9 | 2 |
| 2003 | 7 | 6 |
| 2004 | 4 | 1 |
| 2005 | 2 | 1 |
| 2006 | 2 | 2 |
| 2007 | 1 | 3 |
| 2008 | 0 | 1 |
| 2009 | 1 | 2 |
| 2010 | 2 | 2 |
| 2011 | 1 | 0 |
| 2012 | 1 | 4 |
| 2013 | 0 | 1 |
| 2014 | 3 | 1 |
| 2015 | 2 | 2 |
| 2016 | 1 | 6 |
| 2017 | 2 | 2 |
| 2018 | 5 | 3 |
| 2019 | 2 | 2 |
| 2020 | 5 | 11 |
| 2021 | 10 | 3 |
| 2022 | 3 | 5 |
| 2023 | 4 | 5 |
| 2024 | 5 | 1 |
| 2025 | 2 | 1 |
| 2026 | 0 | 1 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
- F02G 2250/03Brayton cyclesIndexing code109
- F02G 2250/18Vuilleumier cyclesIndexing code102
- F02G 2250/31Nano- or microenginesIndexing code14
- F02G 2250/09Carnot cycles in generalIndexing code8
- F02G 2250/24Ringbom engines, the displacement of the free displacer being obtained by expansionIndexing code6
- F02G 2250/27Martini stirling enginesIndexing code5
- F02G 2250/12Malone liquid thermal cyclesIndexing code4
- F02G 2250/21Cooke yarborough enginesIndexing code2
Recent patents
- Alternative heat source for an engine19 Aug 2025US 12,392,279 B1
- Multi-temperature double-acting piston21 Jan 2025US 12,203,427 B2
- Engine apparatus and method for operation29 Oct 2024US 12,129,812 B2Hyliion Holdings Corp.
- Combined Brayton and Stirling cycle power generator17 Sep 2024US 12,092,054 B1United States Government Administrator of NASA
- Reciprocating heat engine with hot cylinder head and cold cylinder4 Jun 2024US 12,000,357 B2
- Regenerator construction and structural design for enhanced performance in vuilleumier heat pumps16 Jul 2026US 2026/0201848 A1
- Heat pump having two thermal-energy storage and release systems5 Jun 2025US 2025/0180303 A1Propellane
- Monolithic heat-exchanger bodies16 May 2024US 2024/0159201 A1Hyliion Holdings Corp.
- Thermal power station and method for generating electric power in a thermal power station9 Nov 2023US 2023/0358168 A1Siemens Gamesa Renewable Energy, Inc.
- Moteur thermique alternatif a culasse chaude et cylindre froid28 Sep 2023US 2023/0304456 A1
Most cited
By later US patents
- Gas turbine inlet air combined pressure boost and cooling method and apparatus207US 5,537,813 ACarolina Power & Light Company · 1996
- Premixed charge compression ignition engine with optimal combustion control196US 6,276,334 B1Cummins Engine Company, Inc. · 2001
- Turbine engine with exhaust gas recirculation173US 4,271,664 AHydragon Corporation · 1981
- External combustion slidable vane motor with air cushions149US 4,672,813 A1987
- Micro miniature refrigerators142US 4,392,362 AThe Board of Trustees of the Leland Stanford Junior University · 1983