F23C 9/08
Combustion apparatus characterised by arrangements for returning combustion products or flue gases
Official title: for reducing temperature in combustion chamber, e.g. for protecting walls of combustion chamber
F23C9/08 (Combustion apparatus characterised by arrangements for returning combustion products or flue gases) appears on 173 US grants and 175 published applications in this corpus.
Search patents in F23C- Granted patents
- 173
- Published applications
- 175
- Assignees
- 134
- Inventors
- 452
- Latest grant
- 26 May 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 1 | 0 |
| 1977 | 0 | 0 |
| 1978 | 0 | 0 |
| 1979 | 0 | 0 |
| 1980 | 0 | 0 |
| 1981 | 1 | 0 |
| 1982 | 0 | 0 |
| 1983 | 0 | 0 |
| 1984 | 1 | 0 |
| 1985 | 2 | 0 |
| 1986 | 0 | 0 |
| 1987 | 2 | 0 |
| 1988 | 1 | 0 |
| 1989 | 1 | 0 |
| 1990 | 1 | 0 |
| 1991 | 0 | 0 |
| 1992 | 3 | 0 |
| 1993 | 1 | 0 |
| 1994 | 2 | 0 |
| 1995 | 2 | 0 |
| 1996 | 2 | 0 |
| 1997 | 6 | 0 |
| 1998 | 3 | 0 |
| 1999 | 1 | 0 |
| 2000 | 9 | 0 |
| 2001 | 3 | 4 |
| 2002 | 8 | 3 |
| 2003 | 6 | 3 |
| 2004 | 8 | 6 |
| 2005 | 4 | 4 |
| 2006 | 2 | 5 |
| 2007 | 0 | 6 |
| 2008 | 2 | 4 |
| 2009 | 4 | 4 |
| 2010 | 3 | 6 |
| 2011 | 5 | 3 |
| 2012 | 3 | 4 |
| 2013 | 3 | 18 |
| 2014 | 3 | 13 |
| 2015 | 3 | 7 |
| 2016 | 9 | 13 |
| 2017 | 8 | 9 |
| 2018 | 13 | 6 |
| 2019 | 12 | 8 |
| 2020 | 8 | 7 |
| 2021 | 1 | 8 |
| 2022 | 6 | 6 |
| 2023 | 3 | 3 |
| 2024 | 5 | 8 |
| 2025 | 8 | 7 |
| 2026 | 4 | 10 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Fuel-air mixing and flame stabilization device for a low emission burner with internal flue gas recirculation26 May 2026US 12,638,174 B2Honeywell International Inc.
- Mixed combustion system fueled with ammonia, hydrogen and natural gas21 Apr 2026US 12,607,348 B2Guangdong University of Technology
- Dark radiator21 Apr 2026US 12,607,349 B2Schwank GmbH
- Building emission processing and/or sequestration systems and methods17 Feb 2026US 12,553,603 B2Carbonquest, Inc.
- Low NOx gas burner with cooled flue gas recycle4 Nov 2025US 12,460,814 B2Honeywell International Inc.
- Building Emission Processing and/or Sequestration Systems and Methods10 Sep 2026US 2026/0266457 A1Carbonquest, Inc.
- Nozzle arrangement for a burner and burner comprising a nozzle arrangement of this type10 Sep 2026US 2026/0266460 A1Benninghoven Zweigniederlassung Der Wirtgen Mineral Technologies GmbH
- Building Emission Processing and/or Sequestration Systems and Methods27 Aug 2026US 2026/0251297 A1Carbonquest, Inc.
- Burner system, method for operating a burner system and method for manufacturing27 Aug 2026US 2026/0251304 A1Deutsches Zentrum für Luft- und Raumfahrt e. V.
- Combustion system capable of operating with a recycling of combustion fumes30 Jul 2026US 2026/0218900 A1Carbodown
Most cited
By later US patents
- Thermal power plant with sequential combustion and reduced-CO2 emission, and a method for operating a plant of this type129US 7,503,178 B2ALSTOM Technology Ltd · 2009
- Fuel dilution methods and apparatus for NOx reduction88US 6,383,461 B1John Zink Company · 2002
- Fuel dilution methods and apparatus for NOx reduction64US 6,383,462 B1John Zink Company · 2002
- Combustion optimization62US 6,712,606 B2Ecomb AB · 2004
- Ultra reduced NOx burner system and process49US 6,485,289 B1Altex Technologies Corporation · 2002