F22B 21/04
Involving a single upper drum and a single lower drum
Official title: involving a single upper drum and a single lower drum, e.g. the drums being arranged transversely
F22B21/04 (Involving a single upper drum and a single lower drum) appears on 50 US grants and 29 published applications in this corpus.
Search patents in F22B- Granted patents
- 50
- Published applications
- 29
- Assignees
- 38
- Inventors
- 117
- Latest grant
- 16 Aug 2022
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 1 | 0 |
| 1977 | 1 | 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 | 0 | 0 |
| 1988 | 0 | 0 |
| 1989 | 2 | 0 |
| 1990 | 1 | 0 |
| 1991 | 0 | 0 |
| 1992 | 0 | 0 |
| 1993 | 2 | 0 |
| 1994 | 0 | 0 |
| 1995 | 0 | 0 |
| 1996 | 0 | 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 | 0 | 0 |
| 2007 | 0 | 1 |
| 2008 | 0 | 1 |
| 2009 | 1 | 3 |
| 2010 | 0 | 5 |
| 2011 | 1 | 1 |
| 2012 | 2 | 0 |
| 2013 | 0 | 1 |
| 2014 | 1 | 1 |
| 2015 | 0 | 3 |
| 2016 | 2 | 2 |
| 2017 | 1 | 0 |
| 2018 | 0 | 2 |
| 2019 | 2 | 4 |
| 2020 | 2 | 2 |
| 2021 | 1 | 0 |
| 2022 | 3 | 0 |
| 2023 | 0 | 0 |
| 2024 | 0 | 0 |
| 2025 | 0 | 1 |
By publication year. Applications have been published since 2001.
Subgroups
Granted patents
Recent patents
- 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
- Waste heat recovery boiler in producing glass beads10 May 2022US 11,326,773 B2
- 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
- Flameless steam boiler8 Sep 2020US 10,767,854 B2Zhejiang Liju Boiler Co., Ltd.
- Boiler device and organic waste treatment device provided with same2 Oct 2025US 2025/0305676 A1Shimose Microbes Laboratory Corporation
- Natural circulation multi-circulation package boiler with superheat for steam assisted gravity drainage (sagd) process including superheat24 Dec 2020US 2020/0400305 A1The Babcock & Wilcox Company
- Boiler and method for controlling boiler18 Jun 2020US 2020/0191382 A1Miura Co., Ltd.
- Flameless Steam Boiler12 Sep 2019US 2019/0277490 A1Zhejiang Liju Boiler Co., Ltd.
- Package boiler with tandem furnace tubes22 Aug 2019US 2019/0257514 A1Superior Boiler, LLC
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