F01K 7/36
The engines being of positive-displacement type
Official title: the engines being of positive-displacement type
F01K7/36 (The engines being of positive-displacement type) appears on 57 US grants and 73 published applications in this corpus.
Search patents in F01K- Granted patents
- 57
- Published applications
- 73
- Assignees
- 45
- Inventors
- 114
- Latest grant
- 17 Feb 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1977 | 1 | 0 |
| 1978 | 0 | 0 |
| 1979 | 0 | 0 |
| 1980 | 0 | 0 |
| 1981 | 0 | 0 |
| 1982 | 0 | 0 |
| 1983 | 0 | 0 |
| 1984 | 0 | 0 |
| 1985 | 0 | 0 |
| 1986 | 0 | 0 |
| 1987 | 0 | 0 |
| 1988 | 0 | 0 |
| 1989 | 0 | 0 |
| 1990 | 0 | 0 |
| 1991 | 0 | 0 |
| 1992 | 0 | 0 |
| 1993 | 0 | 0 |
| 1994 | 0 | 0 |
| 1995 | 0 | 0 |
| 1996 | 0 | 0 |
| 1997 | 0 | 0 |
| 1998 | 0 | 0 |
| 1999 | 0 | 0 |
| 2000 | 0 | 0 |
| 2001 | 0 | 0 |
| 2002 | 0 | 0 |
| 2003 | 0 | 0 |
| 2004 | 0 | 0 |
| 2005 | 0 | 2 |
| 2006 | 0 | 3 |
| 2007 | 3 | 1 |
| 2008 | 1 | 0 |
| 2009 | 0 | 2 |
| 2010 | 0 | 2 |
| 2011 | 0 | 5 |
| 2012 | 0 | 1 |
| 2013 | 4 | 7 |
| 2014 | 1 | 5 |
| 2015 | 4 | 5 |
| 2016 | 4 | 4 |
| 2017 | 4 | 7 |
| 2018 | 7 | 4 |
| 2019 | 3 | 2 |
| 2020 | 3 | 7 |
| 2021 | 8 | 3 |
| 2022 | 2 | 4 |
| 2023 | 2 | 2 |
| 2024 | 4 | 1 |
| 2025 | 5 | 4 |
| 2026 | 1 | 2 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Organic rankine cycle decompression heat engine17 Feb 2026US 12,553,345 B2Heat Source Energy Corp.
- Acclimatized liquid powered dual circuit heat pump11 Nov 2025US 12,467,665 B2Heat Source Energy Corp.
- Plant and process of converting thermal energy into mechanical and/or electrical energy27 May 2025US 12,312,980 B2Star Engine S.R.L.
- Heat engine22 Apr 2025US 12,281,601 B2Technion Research & Development Foundation Limited
- Heat engine15 Apr 2025US 12,276,211 B2University of Newcastle Upon Tyne
- Organic Rankine Cycle Decompression Heat Engine21 May 2026US 2026/0139592 A1Heat Source Energy Corp.
- Acclimatized Liquid Powered Dual Circuit Heat Pump5 Mar 2026US 2026/0063339 A1Heat Source Energy Corp.
- Acclimatized Liquid Powered Dual Circuit Heat Pump2 Oct 2025US 2025/0305729 A1Heat Source Energy Corp.
- Organic Rankine Cycle Decompression Heat Engine28 Aug 2025US 2025/0270932 A1Heat Source Energy Corp.
- Heat engine3 Jul 2025US 2025/0215813 A1Technion Research & Development Foundation Limited
Most cited
By later US patents
- Liquid piston internal combustion power system47US 7,191,738 B2LiquidPiston, Inc. · 2007
- Heat energy recovery apparatus47US 7,448,213 B2Toyota Jidosha Kabushiki Kaisha · 2008
- Organic rankine cycle decompression heat engine46US 9,745,870 B2Heat Source Energy Corp. · 2017
- Systems and methods for efficient two-phase heat transfer in compressed-air energy storage systems43US 8,539,763 B2SustainX, Inc. · 2013
- Systems and methods for efficient two-phase heat transfer in compressed-air energy storage systems43US 8,806,866 B2SustainX, Inc. · 2014