F22B 7/12
Steam boilers of furnace-tube type, i.e. the combustion of fuel being performed
Official title: with auxiliary fire tubes; Arrangement of header boxes providing for return diversion of flue gas flow
F22B7/12 (Steam boilers of furnace-tube type, i.e. the combustion of fuel being performed) appears on 34 US grants and 11 published applications in this corpus.
Search patents in F22B- Granted patents
- 34
- Published applications
- 11
- Assignees
- 25
- Inventors
- 47
- Latest grant
- 2 Jun 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1977 | 1 | 0 |
| 1978 | 2 | 0 |
| 1979 | 3 | 0 |
| 1980 | 2 | 0 |
| 1981 | 3 | 0 |
| 1982 | 0 | 0 |
| 1983 | 1 | 0 |
| 1984 | 0 | 0 |
| 1985 | 0 | 0 |
| 1986 | 1 | 0 |
| 1987 | 0 | 0 |
| 1988 | 0 | 0 |
| 1989 | 0 | 0 |
| 1990 | 0 | 0 |
| 1991 | 0 | 0 |
| 1992 | 1 | 0 |
| 1993 | 1 | 0 |
| 1994 | 0 | 0 |
| 1995 | 2 | 0 |
| 1996 | 1 | 0 |
| 1997 | 1 | 0 |
| 1998 | 0 | 0 |
| 1999 | 0 | 0 |
| 2000 | 2 | 0 |
| 2001 | 0 | 0 |
| 2002 | 0 | 0 |
| 2003 | 1 | 0 |
| 2004 | 0 | 0 |
| 2005 | 1 | 2 |
| 2006 | 2 | 2 |
| 2007 | 0 | 0 |
| 2008 | 1 | 1 |
| 2009 | 1 | 0 |
| 2010 | 0 | 0 |
| 2011 | 0 | 0 |
| 2012 | 1 | 0 |
| 2013 | 0 | 0 |
| 2014 | 0 | 0 |
| 2015 | 1 | 0 |
| 2016 | 0 | 0 |
| 2017 | 0 | 0 |
| 2018 | 0 | 2 |
| 2019 | 2 | 1 |
| 2020 | 0 | 0 |
| 2021 | 1 | 1 |
| 2022 | 0 | 0 |
| 2023 | 0 | 2 |
| 2024 | 0 | 0 |
| 2025 | 1 | 0 |
| 2026 | 1 | 0 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Boiler tube insert and boiler tubes having inserts2 Jun 2026US 12,644,594 B2Cleaver-Brooks, Inc.
- Downward mobile gasification boiler for surface gas phase combustion and pyrolysis of biomass briquette11 Nov 2025US 12,467,620 B2Heilongjiang Zhongtan Jiahe Biomass Technology Research and Development Co.
- Method and apparatus for waste heat recovery and emission reduction12 Oct 2021US 11,143,396 B2Preferred Utilities Manufacturing Corporation
- System, apparatus and method for heating homes and other buildings5 Nov 2019US 10,465,917 B2Health Mechanical Services, LLC
- Method and apparatus for firetube boiler and ultra low NOx burner20 Aug 2019US 10,386,061 B2Preferred Utilities Manufacturing Corporation
- Boiler Tube Insert and Boiler Tubes Having Inserts2 Nov 2023US 2023/0349546 A1Cleaver-Brooks, Inc.
- Downward mobile gasification boiler for surface gas phase combustion and pyrolysis of biomass briquette15 Jun 2023US 2023/0184424 A1Heilongjiang Zhongtan Jiahe Biomass Te Chnology Research and Development Co.
- Apparatus for Firetube Boiler and Ultra Low NOx Burner7 Jan 2021US 2021/0003277 A1
- Method and Apparatus for Waste Heat Recovery and Emission Reduction20 Jun 2019US 2019/0186730 A1Preferred Utilities Manufacturing Corporation
- System, Apparatus and Method for Heating Homes and Other Buildings26 Jul 2018US 2018/0209664 A1Heath Mechanical Services, LLC
Most cited
By later US patents
- Process and apparatus for heating fluids employing a pulse combustor44US 5,211,704 AManufacturing and Technology Conversion International, Inc. · 1993
- Steam cooker and related superheater35US 7,418,960 B2Premark FEG L.L.C. · 2008
- Coal feed and injection system for a coal-fired firetube boiler29US 5,630,368 AThe University of Tennessee Research Corporation · 1997
- Combustion of halogenated hydrocarbons with heat recovery19US 4,627,388 AThe Dow Chemical Company · 1986
- System for purifying contaminated air14US 5,161,488 AKoenig AG · 1992