F22B
Methods of steam generation
Official title: Methods of steam generation; steam boilers
F22B (Methods of steam generation) appears on 5,805 US grants and 4,335 published applications in this corpus.
Search patents in F22B- Granted patents
- 5,805
- Published applications
- 4,335
- Assignees
- 2,182
- Inventors
- 10,184
- Latest grant
- 6 Oct 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 74 | 0 |
| 1977 | 80 | 0 |
| 1978 | 82 | 0 |
| 1979 | 57 | 0 |
| 1980 | 105 | 0 |
| 1981 | 134 | 0 |
| 1982 | 86 | 0 |
| 1983 | 105 | 0 |
| 1984 | 158 | 0 |
| 1985 | 130 | 0 |
| 1986 | 123 | 0 |
| 1987 | 180 | 0 |
| 1988 | 140 | 0 |
| 1989 | 146 | 0 |
| 1990 | 119 | 0 |
| 1991 | 111 | 0 |
| 1992 | 84 | 0 |
| 1993 | 81 | 0 |
| 1994 | 101 | 0 |
| 1995 | 67 | 0 |
| 1996 | 74 | 0 |
| 1997 | 51 | 0 |
| 1998 | 92 | 0 |
| 1999 | 68 | 0 |
| 2000 | 75 | 0 |
| 2001 | 77 | 13 |
| 2002 | 58 | 42 |
| 2003 | 53 | 51 |
| 2004 | 51 | 57 |
| 2005 | 50 | 61 |
| 2006 | 61 | 109 |
| 2007 | 44 | 114 |
| 2008 | 47 | 138 |
| 2009 | 56 | 168 |
| 2010 | 76 | 192 |
| 2011 | 96 | 227 |
| 2012 | 98 | 258 |
| 2013 | 149 | 288 |
| 2014 | 192 | 274 |
| 2015 | 170 | 283 |
| 2016 | 195 | 273 |
| 2017 | 230 | 226 |
| 2018 | 215 | 244 |
| 2019 | 272 | 235 |
| 2020 | 206 | 201 |
| 2021 | 181 | 179 |
| 2022 | 178 | 191 |
| 2023 | 167 | 165 |
| 2024 | 160 | 164 |
| 2025 | 125 | 114 |
| 2026 | 75 | 68 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Main groups
Granted patents with any code in the group
- F22B 1/00Methods of steam generation characterised by form of heating method2,509
- F22B 37/00Component parts or details of steam boilers2,264
- F22B 31/00Modifications of boiler construction, or of tube systems, dependent on installation of614
- F22B 35/00Control systems for steam boilers595
- F22B 21/00Water-tube boilers of vertical or steeply-inclined type, i.e. the water-tube sets being258
- F22B 29/00Steam boilers of forced-flow type257
- F22B 3/00Methods of steam generation: other methods of steam generation227
- F22B 27/00Instantaneous or flash steam boilers116
All 19 main groupsShow fewer
- F22B 33/00Steam-generation plants115
- F22B 7/00Steam boilers of furnace-tube type, i.e. the combustion of fuel being performed79
- F22B 9/00Steam boilers of fire-tube type, i.e. the flue gas from a combustion65
- F22B 13/00Steam boilers of fire-box type, i.e. boilers where both combustion chambers and40
- F22B 15/00Water-tube boilers of horizontal type, i.e. the water-tube sets being arranged horizontally36
- F22B 5/00Steam boilers of drum type, i.e. without internal furnace or fire tubes10
- F22B 11/00Steam boilers of combined fire-tube type and water-tube type, i.e. steam boilers8
- F22B 17/00Water-tube boilers of horizontally-inclined type, i.e. the water-tube sets being inclined slightly7
- F22B 23/00Water-tube boilers built-up from sets of spaced double-walled water tubes of return6
- F22B 25/00Water-tube boilers built-up from sets of water tubes with internally-arranged flue tubes5
- F22B 19/00Water-tube boilers of combined horizontally-inclined type and vertical type, i.e. water-tube boilers3
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By later US patents
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