F22B 21/22
Built-up from water tubes of form other than straight or substantially straight
Official title: built-up from water tubes of form other than straight or substantially straight
F22B21/22 (Built-up from water tubes of form other than straight or substantially straight) appears on 83 US grants and 50 published applications in this corpus.
Search patents in F22B- Granted patents
- 83
- Published applications
- 50
- Assignees
- 63
- Inventors
- 179
- Latest grant
- 31 Dec 2024
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 3 | 0 |
| 1977 | 1 | 0 |
| 1978 | 1 | 0 |
| 1979 | 0 | 0 |
| 1980 | 0 | 0 |
| 1981 | 5 | 0 |
| 1982 | 2 | 0 |
| 1983 | 2 | 0 |
| 1984 | 4 | 0 |
| 1985 | 5 | 0 |
| 1986 | 3 | 0 |
| 1987 | 4 | 0 |
| 1988 | 2 | 0 |
| 1989 | 0 | 0 |
| 1990 | 1 | 0 |
| 1991 | 3 | 0 |
| 1992 | 1 | 0 |
| 1993 | 2 | 0 |
| 1994 | 2 | 0 |
| 1995 | 2 | 0 |
| 1996 | 1 | 0 |
| 1997 | 1 | 0 |
| 1998 | 3 | 0 |
| 1999 | 3 | 0 |
| 2000 | 2 | 0 |
| 2001 | 0 | 0 |
| 2002 | 0 | 0 |
| 2003 | 0 | 2 |
| 2004 | 0 | 2 |
| 2005 | 0 | 0 |
| 2006 | 2 | 3 |
| 2007 | 0 | 1 |
| 2008 | 0 | 0 |
| 2009 | 1 | 1 |
| 2010 | 0 | 4 |
| 2011 | 1 | 2 |
| 2012 | 0 | 4 |
| 2013 | 2 | 4 |
| 2014 | 2 | 3 |
| 2015 | 5 | 4 |
| 2016 | 2 | 3 |
| 2017 | 1 | 0 |
| 2018 | 2 | 2 |
| 2019 | 2 | 5 |
| 2020 | 5 | 1 |
| 2021 | 1 | 0 |
| 2022 | 2 | 4 |
| 2023 | 1 | 0 |
| 2024 | 1 | 1 |
| 2025 | 0 | 1 |
| 2026 | 0 | 3 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Reforming furnace31 Dec 2024US 12,179,165 B2Osaka Gas Co., Ltd.
- High-efficiency two-chamber boiler using turbulent reverse flow of combustion gases20 Jun 2023US 11,680,704 B2
- Vapour and liquid drum for a shell-and-tube heat exchanger27 Dec 2022US 11,536,447 B2Alfa Laval Olmi S.P.A
- Package boiler with tandem furnace tubes12 Apr 2022US 11,300,285 B2Superior Boiler, LLC
- Multiple pass flexible water tube boiler and method of using same13 Jul 2021US 11,060,717 B2Superior Boiler, LLC
- Fuel saving super steam boilers2 Jul 2026US 2026/0185696 A1Universal Dynamics Inovasyon Ve Teknoloji Anonim Sirketi
- Steam generation device18 Jun 2026US 2026/0168666 A1Yuyao Hengxi Technology Co., Ltd.
- Fired process heater with a manifold support assembly11 Jun 2026US 2026/0160415 A1Zeeco, Inc.
- Apparatus of generating water vapor and fuel cell system having the apparatus4 Dec 2025US 2025/0372682 A1Mico Power Ltd.
- Gas-fired steam-injection boiler for oil field24 Oct 2024US 2024/0353095 A1China Petroleum & Chemical Corporation
Most cited
By later US patents
- Heat exchanger29US 4,611,655 APower Shaft Engine, Limited Partnership · 1986
- Power generation methods and systems27US 7,019,412 B2Research Sciences, L.L.C. · 2006
- Method and apparatus for low NOX combustion of gaseous fuels22US 5,259,342 AMark IV Transportation Products Corporation · 1993
- Method and apparatus for viscosity reduction of clogging hydrocarbons in oil well21US 5,979,549 A1999
- Multi-pass helical coil thermal fluid heater19US 4,357,910 A1982