F22B 37/06
Flue or fire tubes
Official title: Flue or fire tubes; Accessories therefor, e.g. fire-tube inserts
F22B37/06 (Flue or fire tubes) appears on 40 US grants and 34 published applications in this corpus.
Search patents in F22B- Granted patents
- 40
- Published applications
- 34
- Assignees
- 34
- Inventors
- 89
- Latest grant
- 2 Jun 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1977 | 3 | 0 |
| 1978 | 0 | 0 |
| 1979 | 1 | 0 |
| 1980 | 0 | 0 |
| 1981 | 0 | 0 |
| 1982 | 1 | 0 |
| 1983 | 0 | 0 |
| 1984 | 1 | 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 | 1 | 0 |
| 1997 | 1 | 0 |
| 1998 | 1 | 0 |
| 1999 | 2 | 0 |
| 2000 | 1 | 0 |
| 2001 | 1 | 0 |
| 2002 | 0 | 0 |
| 2003 | 0 | 0 |
| 2004 | 0 | 0 |
| 2005 | 0 | 0 |
| 2006 | 0 | 2 |
| 2007 | 1 | 0 |
| 2008 | 0 | 1 |
| 2009 | 0 | 1 |
| 2010 | 0 | 1 |
| 2011 | 0 | 0 |
| 2012 | 0 | 1 |
| 2013 | 1 | 1 |
| 2014 | 1 | 1 |
| 2015 | 0 | 1 |
| 2016 | 2 | 2 |
| 2017 | 0 | 4 |
| 2018 | 3 | 2 |
| 2019 | 2 | 3 |
| 2020 | 3 | 2 |
| 2021 | 3 | 3 |
| 2022 | 3 | 5 |
| 2023 | 3 | 1 |
| 2024 | 1 | 0 |
| 2025 | 0 | 3 |
| 2026 | 2 | 0 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Boiler tube insert and boiler tubes having inserts2 Jun 2026US 12,644,594 B2Cleaver-Brooks, Inc.
- Heat exchanger baffles and methods for manufacturing the same19 May 2026US 12,631,409 B2Bradford White Corporation
- Condensing, ultra-low NOx gas-fired humidifier26 Mar 2024US 11,940,178 B2DRI-STEEM Corporation
- Steam generator and cooking apparatus including steam generator28 Nov 2023US 11,828,458 B2LG Electronics Inc.
- Heat exchange tube of waste heat boiler24 Oct 2023US 11,796,170 B2Zhejiang University
- Heat damper for a waste heat recovery unit and waste heat recovery unit comprising a heat damper27 Feb 2025US 2025/0067427 A1Nuovo Pignone Tecnologie Srl
- Tube sheet protection in a process gas waste heat boiler13 Feb 2025US 2025/0052414 A1Topsoe A/S
- Condensing, Ultra-Low NOx Gas-Fired Humidifier9 Jan 2025US 2025/0012462 A1DRI-STEEM Corporation
- Boiler Tube Insert and Boiler Tubes Having Inserts2 Nov 2023US 2023/0349546 A1Cleaver-Brooks, Inc.
- Condensing, Ultra-Low NOx Gas-Fired Humidfier22 Dec 2022US 2022/0404041 A1DRI-STEEM Corporation
Most cited
By later US patents
- Process and apparatus utilizing common structure for combustion, gas fixation, or waste heat recovery53US 4,344,479 AFuelsaver Company · 1982
- Boiler protection tube assembly18US 5,775,269 AIndustrial Ceramics Limited · 1998
- Turbulator17US 4,044,796 A1977
- Ceramic ferrule and ceramic ferrule refractory wall for shielding tube sheet/boiler tube assembly of heat exchanger14US 5,647,432 ABlasch Precision Ceramics, Inc. · 1997
- Gas-fired steam cooker13US 4,552,123 AThermo Electron Corporation · 1985