F22D 1/00
Feed-water heaters, i.e. economisers or like preheaters
F22D1/00 (Feed-water heaters, i.e. economisers or like preheaters) appears on 310 US grants and 276 published applications in this corpus.
Search patents in F22D- Granted patents
- 310
- Published applications
- 276
- Assignees
- 195
- Inventors
- 761
- Latest grant
- 18 Aug 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 3 | 0 |
| 1977 | 8 | 0 |
| 1978 | 6 | 0 |
| 1979 | 3 | 0 |
| 1980 | 7 | 0 |
| 1981 | 4 | 0 |
| 1982 | 5 | 0 |
| 1983 | 3 | 0 |
| 1984 | 9 | 0 |
| 1985 | 5 | 0 |
| 1986 | 6 | 0 |
| 1987 | 7 | 0 |
| 1988 | 2 | 0 |
| 1989 | 6 | 0 |
| 1990 | 2 | 0 |
| 1991 | 3 | 0 |
| 1992 | 0 | 0 |
| 1993 | 1 | 0 |
| 1994 | 5 | 0 |
| 1995 | 3 | 0 |
| 1996 | 1 | 0 |
| 1997 | 4 | 0 |
| 1998 | 5 | 0 |
| 1999 | 2 | 0 |
| 2000 | 3 | 0 |
| 2001 | 0 | 3 |
| 2002 | 5 | 2 |
| 2003 | 2 | 0 |
| 2004 | 1 | 4 |
| 2005 | 2 | 2 |
| 2006 | 6 | 9 |
| 2007 | 3 | 2 |
| 2008 | 0 | 6 |
| 2009 | 6 | 10 |
| 2010 | 1 | 12 |
| 2011 | 2 | 6 |
| 2012 | 6 | 14 |
| 2013 | 4 | 19 |
| 2014 | 6 | 23 |
| 2015 | 14 | 24 |
| 2016 | 14 | 18 |
| 2017 | 13 | 17 |
| 2018 | 22 | 18 |
| 2019 | 24 | 14 |
| 2020 | 16 | 8 |
| 2021 | 14 | 12 |
| 2022 | 10 | 10 |
| 2023 | 10 | 12 |
| 2024 | 11 | 13 |
| 2025 | 6 | 10 |
| 2026 | 9 | 8 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
- F22D 1/32Arranged to be heated by steam92
- F22D 1/02Feed-water heaters, i.e. economisers or like preheaters: with water tubes arranged in91
- F22D 1/003Feed-water heater systems45
- F22D 1/36Water and air preheating systems42
- F22D 1/28Feed-water heaters, i.e. economisers or like preheaters: for direct heat transfer26
- F22D 1/16Feed-water heaters, i.e. economisers or like preheaters: with water tubes arranged otherwise23
- F22D 1/50Incorporating thermal de-aeration of feed-water13
- F22D 1/40Combinations of exhaust-steam and smoke-gas preheaters9
All 12 subgroupsShow fewer
- F22D 1/24Feed-water heaters, i.e. economisers or like preheaters: with fire tubes or flue6
- F22D 1/006Feed-water heaters, i.e. economisers or like preheaters: with heating tubes2
- F22D 1/26Feed-water heaters, i.e. economisers or like preheaters: with means, other than tubes0
- F22D 1/42Feed-water heaters, i.e. economisers or like preheaters: specially adapted for locomotives0
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Most cited
By later US patents
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