F22B 21/00
Water-tube boilers of vertical or steeply-inclined type, i.e. the water-tube sets being
Official title: Water-tube boilers of vertical or steeply-inclined type, i.e. the water-tube sets being arranged vertically or substantially vertically
F22B21/00 (Water-tube boilers of vertical or steeply-inclined type, i.e. the water-tube sets being) appears on 258 US grants and 200 published applications in this corpus.
Search patents in F22B- Granted patents
- 258
- Published applications
- 200
- Assignees
- 156
- Inventors
- 581
- Latest grant
- 19 May 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 4 | 0 |
| 1977 | 4 | 0 |
| 1978 | 3 | 0 |
| 1979 | 2 | 0 |
| 1980 | 2 | 0 |
| 1981 | 6 | 0 |
| 1982 | 3 | 0 |
| 1983 | 7 | 0 |
| 1984 | 6 | 0 |
| 1985 | 6 | 0 |
| 1986 | 4 | 0 |
| 1987 | 5 | 0 |
| 1988 | 3 | 0 |
| 1989 | 2 | 0 |
| 1990 | 3 | 0 |
| 1991 | 6 | 0 |
| 1992 | 1 | 0 |
| 1993 | 9 | 0 |
| 1994 | 4 | 0 |
| 1995 | 4 | 0 |
| 1996 | 2 | 0 |
| 1997 | 2 | 0 |
| 1998 | 4 | 0 |
| 1999 | 5 | 0 |
| 2000 | 7 | 0 |
| 2001 | 4 | 1 |
| 2002 | 6 | 6 |
| 2003 | 3 | 3 |
| 2004 | 2 | 4 |
| 2005 | 1 | 1 |
| 2006 | 5 | 8 |
| 2007 | 2 | 4 |
| 2008 | 2 | 9 |
| 2009 | 7 | 12 |
| 2010 | 3 | 11 |
| 2011 | 4 | 12 |
| 2012 | 3 | 12 |
| 2013 | 7 | 15 |
| 2014 | 11 | 15 |
| 2015 | 12 | 11 |
| 2016 | 10 | 13 |
| 2017 | 12 | 11 |
| 2018 | 10 | 8 |
| 2019 | 20 | 14 |
| 2020 | 9 | 7 |
| 2021 | 9 | 2 |
| 2022 | 5 | 5 |
| 2023 | 4 | 3 |
| 2024 | 1 | 4 |
| 2025 | 1 | 6 |
| 2026 | 1 | 3 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
- F22B 21/02Built-up from substantially-straight water tubes91
- F22B 21/22Built-up from water tubes of form other than straight or substantially straight83
- F22B 21/34Built-up from water tubes grouped in panel form surrounding the combustion chamber72
- F22B 21/002Involving a single upper drum12
- F22B 21/40Built-up from water tubes arranged in a comparatively long vertical shaft, i.e.9
- F22B 21/005Involving a central vertical drum, header or downcomer4
- F22B 21/007Water-tube boilers of vertical or steeply-inclined type, i.e. the water-tube sets being0
Recent patents
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Most cited
By later US patents
- Drone for inspection of enclosed space and method thereof113US 8,874,283 B1United Dynamics Advanced Technologies Corporation · 2014
- Devices using a medium having a high heat transfer rate103US 7,220,365 B2New Qu Energy Ltd. · 2007
- Downhole steam generator using low pressure fuel and air supply51US 4,390,062 AThe United States of America as represented by the United States Department of Energy · 1983
- Synthesis gas cooler and waste heat boiler38US 4,377,132 ATexaco Development Corporation · 1983
- Heat exchanger29US 4,611,655 APower Shaft Engine, Limited Partnership · 1986