F01K 25/08
Plants or engines characterised by use of special working fluids, not otherwise
Official title: using special vapours
F01K25/08 (Plants or engines characterised by use of special working fluids, not otherwise) appears on 1,384 US grants and 1,589 published applications in this corpus.
Search patents in F01K- Granted patents
- 1,384
- Published applications
- 1,589
- Assignees
- 625
- Inventors
- 2,326
- Latest grant
- 15 Sep 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 14 | 0 |
| 1977 | 11 | 0 |
| 1978 | 10 | 0 |
| 1979 | 8 | 0 |
| 1980 | 10 | 0 |
| 1981 | 7 | 0 |
| 1982 | 16 | 0 |
| 1983 | 7 | 0 |
| 1984 | 16 | 0 |
| 1985 | 11 | 0 |
| 1986 | 8 | 0 |
| 1987 | 5 | 0 |
| 1988 | 5 | 0 |
| 1989 | 6 | 0 |
| 1990 | 6 | 0 |
| 1991 | 3 | 0 |
| 1992 | 1 | 0 |
| 1993 | 4 | 0 |
| 1994 | 2 | 0 |
| 1995 | 3 | 0 |
| 1996 | 10 | 0 |
| 1997 | 2 | 0 |
| 1998 | 4 | 0 |
| 1999 | 4 | 0 |
| 2000 | 9 | 0 |
| 2001 | 5 | 1 |
| 2002 | 6 | 9 |
| 2003 | 8 | 14 |
| 2004 | 8 | 21 |
| 2005 | 9 | 13 |
| 2006 | 13 | 19 |
| 2007 | 9 | 22 |
| 2008 | 6 | 22 |
| 2009 | 9 | 45 |
| 2010 | 16 | 58 |
| 2011 | 23 | 96 |
| 2012 | 32 | 89 |
| 2013 | 62 | 104 |
| 2014 | 72 | 103 |
| 2015 | 57 | 105 |
| 2016 | 70 | 121 |
| 2017 | 117 | 110 |
| 2018 | 113 | 104 |
| 2019 | 89 | 83 |
| 2020 | 94 | 98 |
| 2021 | 86 | 66 |
| 2022 | 74 | 86 |
| 2023 | 74 | 55 |
| 2024 | 71 | 70 |
| 2025 | 52 | 48 |
| 2026 | 27 | 27 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Two-phase thermal pump15 Sep 2026US 12,735,999 B2Rolls-Royce North American Technologies Inc.
- Sterically hindered hydrofluoroolefins with dipole moment and their blends with sterically hindered-olefins as refrigerants for high temperature heat pumps and working fluid for organic Rankine cycles8 Sep 2026US 12,729,332 B2Carbon Ventures, LLC
- Energy storage device and method based on carbon dioxide gas-liquid phase change25 Aug 2026US 12,716,659 B2Exa Energy Technology (Shenzhen) Co. Ltd.
- Comprehensive energy utilization system for coupling carbon capture, energy storage, and thermal power generation18 Aug 2026US 12,710,000 B2Exax Energy Technology (Shenzhen) Co., Ltd
- Ambient temperature thermal adapter for supercritical carbon dioxide power cycle4 Aug 2026US 12,698,730 B2TerraPower, LLC
- Ambient temperature thermal adapter for supercritical carbon dioxide power cycle8 Oct 2026US 2026/0309058 A1TerraPower, LLC
- Plant and process for energy management1 Oct 2026US 2026/0298112 A1Energy Dome S.P.A.
- Method of generating energy from sequestered supercritical carbon dioxide17 Sep 2026US 2026/0275831 A1Halliburton Energy Services.Inc.
- Geothermal power generation systems with pressure exchangers17 Sep 2026US 2026/0275967 A1Energy Recovery, Inc.
- Power generation system3 Sep 2026US 2026/0258737 A1Twenty20 Energy Systems Pte Ltd
Most cited
By later US patents
- Submersible power generators and method of operating thereof331US 9,651,032 B2General Electric Company · 2017
- Carbon dioxide power cycle257US 4,498,289 A1985
- Power plant using CO.sub.2 as a working fluid175US 4,765,143 ACBI Research Corporation · 1988
- Rotary engine expansion chamber apparatus and method of operation therefor140US 8,523,547 B22013
- Thermodynamic cycles with supercritical CO.sub.2 cycle topping131US 3,971,211 AMcDonnell Douglas Corporation · 1976