F01K 21/00
Steam engine plants not otherwise provided for
F01K21/00 (Steam engine plants not otherwise provided for) appears on 587 US grants and 395 published applications in this corpus.
Search patents in F01K- Granted patents
- 587
- Published applications
- 395
- Assignees
- 246
- Inventors
- 961
- Latest grant
- 14 Jul 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 5 | 0 |
| 1977 | 7 | 0 |
| 1978 | 9 | 0 |
| 1979 | 6 | 0 |
| 1980 | 5 | 0 |
| 1981 | 14 | 0 |
| 1982 | 6 | 0 |
| 1983 | 14 | 0 |
| 1984 | 11 | 0 |
| 1985 | 19 | 0 |
| 1986 | 5 | 0 |
| 1987 | 9 | 0 |
| 1988 | 14 | 0 |
| 1989 | 8 | 0 |
| 1990 | 7 | 0 |
| 1991 | 6 | 0 |
| 1992 | 7 | 0 |
| 1993 | 9 | 0 |
| 1994 | 8 | 0 |
| 1995 | 9 | 0 |
| 1996 | 11 | 0 |
| 1997 | 13 | 0 |
| 1998 | 10 | 0 |
| 1999 | 17 | 0 |
| 2000 | 13 | 0 |
| 2001 | 28 | 8 |
| 2002 | 23 | 17 |
| 2003 | 18 | 15 |
| 2004 | 10 | 25 |
| 2005 | 17 | 17 |
| 2006 | 11 | 22 |
| 2007 | 13 | 18 |
| 2008 | 10 | 15 |
| 2009 | 5 | 18 |
| 2010 | 7 | 23 |
| 2011 | 11 | 14 |
| 2012 | 13 | 11 |
| 2013 | 9 | 17 |
| 2014 | 12 | 18 |
| 2015 | 12 | 14 |
| 2016 | 18 | 21 |
| 2017 | 15 | 21 |
| 2018 | 17 | 20 |
| 2019 | 15 | 15 |
| 2020 | 15 | 10 |
| 2021 | 11 | 10 |
| 2022 | 10 | 14 |
| 2023 | 14 | 5 |
| 2024 | 12 | 14 |
| 2025 | 13 | 11 |
| 2026 | 6 | 2 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
- F01K 21/04Steam engine plants not otherwise provided for: using mixtures of steam and371
- F01K 21/005Steam engine plants not otherwise provided for: using mixtures of liquid and95
- F01K 21/02Steam engine plants not otherwise provided for: with steam-generation in engine-cylinders36
- F01K 21/06Treating live steam, other than thermodynamically35
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