F01K 25/06
Plants or engines characterised by use of special working fluids, not otherwise
Official title: using mixtures of different fluids (plants using mixtures of steam and gas F01K21/04)
F01K25/06 (Plants or engines characterised by use of special working fluids, not otherwise) appears on 436 US grants and 380 published applications in this corpus.
Search patents in F01K- Granted patents
- 436
- Published applications
- 380
- Assignees
- 191
- Inventors
- 562
- Latest grant
- 22 Sep 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 2 | 0 |
| 1977 | 4 | 0 |
| 1978 | 4 | 0 |
| 1979 | 0 | 0 |
| 1980 | 3 | 0 |
| 1981 | 6 | 0 |
| 1982 | 12 | 0 |
| 1983 | 4 | 0 |
| 1984 | 9 | 0 |
| 1985 | 8 | 0 |
| 1986 | 8 | 0 |
| 1987 | 3 | 0 |
| 1988 | 7 | 0 |
| 1989 | 7 | 0 |
| 1990 | 1 | 0 |
| 1991 | 4 | 0 |
| 1992 | 3 | 0 |
| 1993 | 1 | 0 |
| 1994 | 0 | 0 |
| 1995 | 2 | 0 |
| 1996 | 4 | 0 |
| 1997 | 2 | 0 |
| 1998 | 7 | 0 |
| 1999 | 2 | 0 |
| 2000 | 14 | 0 |
| 2001 | 9 | 0 |
| 2002 | 3 | 2 |
| 2003 | 3 | 4 |
| 2004 | 6 | 5 |
| 2005 | 4 | 6 |
| 2006 | 7 | 11 |
| 2007 | 3 | 9 |
| 2008 | 8 | 8 |
| 2009 | 6 | 14 |
| 2010 | 7 | 21 |
| 2011 | 7 | 22 |
| 2012 | 18 | 22 |
| 2013 | 24 | 36 |
| 2014 | 25 | 22 |
| 2015 | 9 | 26 |
| 2016 | 21 | 15 |
| 2017 | 28 | 28 |
| 2018 | 27 | 35 |
| 2019 | 21 | 20 |
| 2020 | 20 | 8 |
| 2021 | 16 | 11 |
| 2022 | 6 | 23 |
| 2023 | 16 | 12 |
| 2024 | 13 | 8 |
| 2025 | 8 | 6 |
| 2026 | 4 | 6 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Heat engine using a liquid-vapor-phase-changing material22 Sep 2026US 12,742,402 B2Lava Energy Ltd
- Thermoutilizer4 Aug 2026US 12,698,729 B2
- Cold heat recovery system and marine vessel or floating body27 Jan 2026US 12,535,249 B2Mitsubishi Heavy Industries, Ltd.
- Method for increasing an entropy flow in a turbomachine20 Jan 2026US 12,529,328 B2
- Low temperature magnetohydrodynamics power system7 Oct 2025US 12,438,432 B2Her Majesty the Queen in right of Canada, as represented by the Minister of Natural Resources
- Two-phase heat engine9 Jul 2026US 2026/0193995 A1Technion Research & Development Foundation Limited
- Thermal energy storage system11 Jun 2026US 2026/0160188 A1Technion Research & Development Foundation Limited
- Device for energy conversion7 May 2026US 2026/0125993 A1Segula Engineering
- Electric energy generation from waste heat with heat transfer fluid pipes16 Apr 2026US 2026/0103631 A1Enover Isi Sistemleri Anonim Sirketi
- Multi-stage power generation using byproducts for enhanced generation5 Mar 2026US 2026/0063057 A1BJ Energy Solutions, LLC
Most cited
By later US patents
- High efficiency absorption heat pump and methods of use143US 7,313,926 B2Rexorce Thermionics, Inc. · 2008
- Method and apparatus for converting heat from geothermal liquid and geothermal steam to electric power142US 5,440,882 AExergy S.P.A. · 1995
- Compressed air energy storage system utilizing two-phase flow to facilitate heat exchange119US 8,436,489 B2LightSail Energy, Inc. · 2013
- Method and apparatus for converting heat from geothermal fluid to electric power114US 4,982,568 A1991
- System and method for heat recovery from geothermal source of heat102US 7,124,584 B1General Electric Company · 2006