F01K 7/34
The engines being of extraction or non-condensing type
Official title: the engines being of extraction or non-condensing type; Use of steam for feed-water heating (feed-water heaters in general F22D)
F01K7/34 (The engines being of extraction or non-condensing type) appears on 315 US grants and 332 published applications in this corpus.
Search patents in F01K- Granted patents
- 315
- Published applications
- 332
- Assignees
- 168
- Inventors
- 673
- Latest grant
- 1 Sep 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 6 | 0 |
| 1977 | 7 | 0 |
| 1978 | 3 | 0 |
| 1979 | 0 | 0 |
| 1980 | 2 | 0 |
| 1981 | 7 | 0 |
| 1982 | 4 | 0 |
| 1983 | 1 | 0 |
| 1984 | 2 | 0 |
| 1985 | 5 | 0 |
| 1986 | 4 | 0 |
| 1987 | 3 | 0 |
| 1988 | 1 | 0 |
| 1989 | 2 | 0 |
| 1990 | 3 | 0 |
| 1991 | 0 | 0 |
| 1992 | 2 | 0 |
| 1993 | 0 | 0 |
| 1994 | 0 | 0 |
| 1995 | 3 | 0 |
| 1996 | 1 | 0 |
| 1997 | 1 | 0 |
| 1998 | 2 | 0 |
| 1999 | 0 | 0 |
| 2000 | 1 | 0 |
| 2001 | 1 | 0 |
| 2002 | 1 | 0 |
| 2003 | 0 | 1 |
| 2004 | 2 | 2 |
| 2005 | 1 | 4 |
| 2006 | 3 | 4 |
| 2007 | 4 | 2 |
| 2008 | 3 | 1 |
| 2009 | 1 | 9 |
| 2010 | 0 | 7 |
| 2011 | 2 | 20 |
| 2012 | 4 | 15 |
| 2013 | 9 | 25 |
| 2014 | 14 | 28 |
| 2015 | 15 | 30 |
| 2016 | 24 | 22 |
| 2017 | 20 | 13 |
| 2018 | 24 | 20 |
| 2019 | 23 | 14 |
| 2020 | 8 | 26 |
| 2021 | 32 | 16 |
| 2022 | 22 | 20 |
| 2023 | 10 | 14 |
| 2024 | 16 | 14 |
| 2025 | 10 | 18 |
| 2026 | 6 | 7 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
- F01K 7/38The engines being of turbine type120
- F01K 7/40Use of two or more feed-water heaters in series89
- F01K 7/36The engines being of positive-displacement type57
- F01K 7/345Control or safety-means particular thereto42
- F01K 7/44Use of steam for feed-water heating and another purpose36
- F01K 7/42Use of desuperheaters for feed-water heating14
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Most cited
By later US patents
- Energy recovery during expansion of compressed gas using power plant low-quality heat sources88US 7,007,474 B1The United States of America as represented by the United States Department of Energy · 2006
- Heat engine system having a selectively configurable working fluid circuit82US 9,874,112 B2Echogen Power Systems, LLC · 2018
- Systems and methods for generating electricity via a pumped thermal energy storage system64US 11,187,112 B2Echogen Power Systems, LLC · 2021
- Regenerative screw expander63US 4,228,657 AHughes Aircraft Company · 1980
- Heat engine system with a supercritical working fluid and processes thereof61US 9,118,226 B2Echogen Power Systems, LLC · 2015