F01K 21/02
Steam engine plants not otherwise provided for: with steam-generation in engine-cylinders
Official title: with steam-generation in engine-cylinders
F01K21/02 (Steam engine plants not otherwise provided for: with steam-generation in engine-cylinders) appears on 36 US grants and 30 published applications in this corpus.
Search patents in F01K- Granted patents
- 36
- Published applications
- 30
- Assignees
- 25
- Inventors
- 65
- Latest grant
- 27 Jan 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 1 | 0 |
| 1977 | 1 | 0 |
| 1978 | 2 | 0 |
| 1979 | 1 | 0 |
| 1980 | 2 | 0 |
| 1981 | 1 | 0 |
| 1982 | 1 | 0 |
| 1983 | 3 | 0 |
| 1984 | 2 | 0 |
| 1985 | 1 | 0 |
| 1986 | 0 | 0 |
| 1987 | 0 | 0 |
| 1988 | 0 | 0 |
| 1989 | 0 | 0 |
| 1990 | 1 | 0 |
| 1991 | 1 | 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 | 2 | 0 |
| 2002 | 1 | 0 |
| 2003 | 0 | 0 |
| 2004 | 0 | 1 |
| 2005 | 0 | 1 |
| 2006 | 0 | 1 |
| 2007 | 1 | 3 |
| 2008 | 0 | 3 |
| 2009 | 0 | 1 |
| 2010 | 0 | 4 |
| 2011 | 3 | 1 |
| 2012 | 2 | 1 |
| 2013 | 0 | 3 |
| 2014 | 1 | 1 |
| 2015 | 0 | 1 |
| 2016 | 3 | 3 |
| 2017 | 1 | 1 |
| 2018 | 1 | 0 |
| 2019 | 2 | 0 |
| 2020 | 0 | 1 |
| 2021 | 0 | 0 |
| 2022 | 0 | 0 |
| 2023 | 0 | 0 |
| 2024 | 0 | 1 |
| 2025 | 1 | 2 |
| 2026 | 1 | 1 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Steam engine27 Jan 2026US 12,535,005 B2Rd Estate GmbH & Co. KG
- Multifuel closed-loop thermal cycle piston engine, system and method4 Mar 2025US 12,241,432 B2Engine Development Corp, LLC
- Method and apparatus utilizing thermally conductive pumps for conversion of thermal energy to mechanical energy19 Mar 2019US 10,233,788 B1
- Wind turbine with thermal battery using noncombustible fuels for storing regenerating energy19 Feb 2019US 10,208,735 B1
- Cryogenic engine system6 Feb 2018US 9,884,546 B2Dearman Engine Company Ltd.
- Thermal energy storage system11 Jun 2026US 2026/0160188 A1Technion Research & Development Foundation Limited
- Air/steam engine and use thereof25 Dec 2025US 2025/0389237 A1
- Steam engine10 Jul 2025US 2025/0223905 A1Rd Estate GmbH & Co. KG
- Multifuel closed-loop thermal cycle piston engine, system and method9 May 2024US 2024/0151193 A1Engine Development Corp, LLC
- System and process for transforming thermal energy into kinetic energy3 Sep 2020US 2020/0277881 A1Triple E Power Ltd.
Most cited
By later US patents
- Reciprocating external combustion engine45US 4,393,653 AThermal Systems Limited · 1983
- Internal combustion engine of hydrogen gas43US 4,508,064 AKatsuji BABA · 1985
- Power plant41US 4,195,481 A1980
- Six cycle combustion and fluid vaporization engine31US 3,964,263 A1976
- Reciprocating heat engine26US 4,426,847 AThermal Systems Limited · 1984