F22B 1/28
In boilers heated electrically
Official title: in boilers heated electrically
F22B1/28 (In boilers heated electrically) appears on 880 US grants and 915 published applications in this corpus.
Search patents in F22B- Granted patents
- 880
- Published applications
- 915
- Assignees
- 456
- Inventors
- 1,604
- Latest grant
- 15 Sep 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 5 | 0 |
| 1977 | 7 | 0 |
| 1978 | 8 | 0 |
| 1979 | 2 | 0 |
| 1980 | 4 | 0 |
| 1981 | 9 | 0 |
| 1982 | 11 | 0 |
| 1983 | 10 | 0 |
| 1984 | 7 | 0 |
| 1985 | 7 | 0 |
| 1986 | 7 | 0 |
| 1987 | 10 | 0 |
| 1988 | 5 | 0 |
| 1989 | 16 | 0 |
| 1990 | 11 | 0 |
| 1991 | 10 | 0 |
| 1992 | 5 | 0 |
| 1993 | 10 | 0 |
| 1994 | 16 | 0 |
| 1995 | 9 | 0 |
| 1996 | 5 | 0 |
| 1997 | 6 | 0 |
| 1998 | 7 | 0 |
| 1999 | 10 | 0 |
| 2000 | 7 | 0 |
| 2001 | 11 | 3 |
| 2002 | 15 | 2 |
| 2003 | 8 | 9 |
| 2004 | 6 | 6 |
| 2005 | 10 | 16 |
| 2006 | 9 | 18 |
| 2007 | 6 | 32 |
| 2008 | 7 | 39 |
| 2009 | 12 | 32 |
| 2010 | 19 | 33 |
| 2011 | 21 | 33 |
| 2012 | 22 | 21 |
| 2013 | 26 | 44 |
| 2014 | 26 | 31 |
| 2015 | 20 | 69 |
| 2016 | 28 | 85 |
| 2017 | 53 | 80 |
| 2018 | 55 | 64 |
| 2019 | 90 | 67 |
| 2020 | 59 | 39 |
| 2021 | 36 | 38 |
| 2022 | 31 | 36 |
| 2023 | 36 | 34 |
| 2024 | 35 | 43 |
| 2025 | 24 | 25 |
| 2026 | 11 | 16 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
- F22B 1/284With water in reservoirs501
- F22B 1/30Electrode boilers112
- F22B 1/282With water or steam circulating in tubes or ducts83
- F22B 1/281Other than by electrical resistances or electrodes80
- F22B 1/287With water in sprays or in films71
- F22B 1/288Instantaneous electrical steam generators built-up from heat-exchange elements arranged within a confined43
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