F22B 21/02
Built-up from substantially-straight water tubes
Official title: built-up from substantially-straight water tubes
F22B21/02 (Built-up from substantially-straight water tubes) appears on 91 US grants and 70 published applications in this corpus.
Search patents in F22B- Granted patents
- 91
- Published applications
- 70
- Assignees
- 60
- Inventors
- 205
- Latest grant
- 19 Sep 2023
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 1 | 0 |
| 1977 | 3 | 0 |
| 1978 | 1 | 0 |
| 1979 | 1 | 0 |
| 1980 | 2 | 0 |
| 1981 | 3 | 0 |
| 1982 | 0 | 0 |
| 1983 | 5 | 0 |
| 1984 | 1 | 0 |
| 1985 | 1 | 0 |
| 1986 | 1 | 0 |
| 1987 | 1 | 0 |
| 1988 | 0 | 0 |
| 1989 | 2 | 0 |
| 1990 | 1 | 0 |
| 1991 | 0 | 0 |
| 1992 | 0 | 0 |
| 1993 | 3 | 0 |
| 1994 | 1 | 0 |
| 1995 | 0 | 0 |
| 1996 | 1 | 0 |
| 1997 | 1 | 0 |
| 1998 | 1 | 0 |
| 1999 | 0 | 0 |
| 2000 | 5 | 0 |
| 2001 | 3 | 0 |
| 2002 | 0 | 1 |
| 2003 | 1 | 0 |
| 2004 | 0 | 1 |
| 2005 | 1 | 0 |
| 2006 | 1 | 1 |
| 2007 | 0 | 1 |
| 2008 | 0 | 4 |
| 2009 | 2 | 8 |
| 2010 | 1 | 5 |
| 2011 | 2 | 4 |
| 2012 | 3 | 1 |
| 2013 | 3 | 7 |
| 2014 | 2 | 3 |
| 2015 | 2 | 4 |
| 2016 | 4 | 6 |
| 2017 | 4 | 4 |
| 2018 | 6 | 4 |
| 2019 | 5 | 5 |
| 2020 | 6 | 5 |
| 2021 | 3 | 1 |
| 2022 | 4 | 1 |
| 2023 | 3 | 1 |
| 2024 | 0 | 1 |
| 2025 | 0 | 2 |
By publication year. Applications have been published since 2001.
Subgroups
Granted patents
- F22B 21/04Involving a single upper drum and a single lower drum50
- F22B 21/14Involving a single upper drum and two or more lower drums10
- F22B 21/12Involving two or more upper drums and two or more lower drums3
- F22B 21/20Involving sectional or subdivided headers in separate arrangement for each water-tube set3
- F22B 21/18Involving two or more upper drums and a single lower drum2
Recent patents
- System and methods for integration of concentrated solar steam generators to Rankine cycle power plants19 Sep 2023US 11,761,622 B2
- Arrangement for storing of energy22 Aug 2023US 11,732,616 B2Calefa Oy
- Natural circulation multi-circulation package boiler for steam assisted gravity drainage (SAGD) process27 Jun 2023US 11,686,470 B2The Babcock & Wilcox Company
- Systems and methods for Utilizing flue gas1 Nov 2022US 11,486,572 B2Suncoke Technology and Development LLC
- Natural circulation multi-circulation package boiler with superheat for steam assisted gravity drainage (SAGD) process including superheat16 Aug 2022US 11,415,314 B2The Babcock & Wilcox Company
- Boiler device and organic waste treatment device provided with same2 Oct 2025US 2025/0305676 A1Shimose Microbes Laboratory Corporation
- Heat Exchanger Element and Use Thereof30 Jan 2025US 2025/0035302 A1Andritz Technology and Asset Management GmbH
- Heat exchanger tube bundle and related heat recovery steam generator21 Nov 2024US 2024/0384945 A1NEM Energy B.V.
- Systems and methods for utilizing flue gas17 Aug 2023US 2023/0258326 A1Suncoke Technology and Development LLC
- Arrangement for storing of energy9 Jun 2022US 2022/0178276 A1Calefa Oy
Most cited
By later US patents
- 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
- Low pressure combustor for generating steam downhole19US 4,377,205 A1983
- Vertical radiation tank19US 4,513,694 A1985
- Multi-pipe once-through type boiler16US 4,825,813 AMiura Co., Ltd. · 1989