F22B 7/04
Steam boilers of furnace-tube type, i.e. the combustion of fuel being performed
Official title: with auxiliary water tubes
F22B7/04 (Steam boilers of furnace-tube type, i.e. the combustion of fuel being performed) appears on 11 US grants and 5 published applications in this corpus.
Search patents in F22B- Granted patents
- 11
- Published applications
- 5
- Assignees
- 7
- Inventors
- 22
- Latest grant
- 23 Sep 2025
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 1 | 0 |
| 1977 | 0 | 0 |
| 1978 | 0 | 0 |
| 1979 | 0 | 0 |
| 1980 | 0 | 0 |
| 1981 | 0 | 0 |
| 1982 | 0 | 0 |
| 1983 | 1 | 0 |
| 1984 | 2 | 0 |
| 1985 | 1 | 0 |
| 1986 | 1 | 0 |
| 1987 | 0 | 0 |
| 1988 | 0 | 0 |
| 1989 | 0 | 0 |
| 1990 | 0 | 0 |
| 1991 | 0 | 0 |
| 1992 | 0 | 0 |
| 1993 | 0 | 0 |
| 1994 | 0 | 0 |
| 1995 | 0 | 0 |
| 1996 | 0 | 0 |
| 1997 | 0 | 0 |
| 1998 | 0 | 0 |
| 1999 | 0 | 0 |
| 2000 | 0 | 0 |
| 2001 | 0 | 0 |
| 2002 | 0 | 0 |
| 2003 | 1 | 1 |
| 2004 | 0 | 0 |
| 2005 | 0 | 0 |
| 2006 | 0 | 0 |
| 2007 | 0 | 0 |
| 2008 | 0 | 0 |
| 2009 | 0 | 0 |
| 2010 | 0 | 0 |
| 2011 | 0 | 0 |
| 2012 | 0 | 0 |
| 2013 | 0 | 0 |
| 2014 | 0 | 1 |
| 2015 | 0 | 0 |
| 2016 | 0 | 1 |
| 2017 | 1 | 0 |
| 2018 | 1 | 0 |
| 2019 | 0 | 0 |
| 2020 | 0 | 0 |
| 2021 | 0 | 0 |
| 2022 | 0 | 0 |
| 2023 | 0 | 0 |
| 2024 | 0 | 1 |
| 2025 | 2 | 1 |
By publication year. Applications have been published since 2001.
Subgroups
Granted patents
Recent patents
- Heat pipe unit and waste heat recovery boiler including same23 Sep 2025US 12,422,193 B2Doosan Enerbility Co., Ltd.
- Sodium-chlorine boiler16 Sep 2025US 12,416,250 B1Teratech International, Inc.
- Burner system employing multiple perforated flame holders, and method of operation4 Sep 2018US 10,066,833 B2Clearsign Combustion Corporation
- Co-fired absorption system generator30 May 2017US 9,664,451 B2Rocky Research
- Single-pass, direct-fired generator for an absorption chiller5 Aug 2003US 6,601,405 B2American Standard Inc.
- Sodium-chlorine boiler11 Sep 2025US 2025/0283422 A1Teratech International, Inc.
- Heat pipe unit and waste heat recovery boiler including same30 May 2024US 2024/0175639 A1Doosan Enerbility Co., Ltd.
- Burner system employing multiple perforated flame holders, and method of operation11 Aug 2016US 2016/0230984 A1Clearsign Combustion Corporation
- Co-fired absorption system generator4 Sep 2014US 2014/0245768 A1Rocky Research
- Single-pass, direct-fired generator for an absorption chiller24 Apr 2003US 2003/0074915 A1American Standard Inc.
Most cited
By later US patents
- Water and room heater11US 3,934,554 A1976
- Hot water heater and steam generator11US 4,612,879 A1986
- Separable combination boiler10US 4,449,485 A1984
- Gas- or oil-burning warm water, hot water or steam boiler9US 4,453,498 AEnergiagazdalkodasi Intezet · 1984
- Vapor generator9US 4,499,859 AHitachi, Ltd. · 1985