F23C 9/00
Combustion apparatus characterised by arrangements for returning combustion products or flue gases
Official title: Combustion apparatus characterised by arrangements for returning combustion products or flue gases to the combustion chamber (fluidised bed combustion apparatus with means for recirculation of particles entrained from the bed F23C10/02; fluidised bed combustion apparatus with devices for removal and partial reintroduction of material from the bed F23C10/26)
F23C9/00 (Combustion apparatus characterised by arrangements for returning combustion products or flue gases) appears on 801 US grants and 702 published applications in this corpus.
Search patents in F23C- Granted patents
- 801
- Published applications
- 702
- Assignees
- 429
- Inventors
- 1,630
- Latest grant
- 6 Oct 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 10 | 0 |
| 1977 | 9 | 0 |
| 1978 | 5 | 0 |
| 1979 | 4 | 0 |
| 1980 | 1 | 0 |
| 1981 | 5 | 0 |
| 1982 | 5 | 0 |
| 1983 | 6 | 0 |
| 1984 | 5 | 0 |
| 1985 | 8 | 0 |
| 1986 | 6 | 0 |
| 1987 | 7 | 0 |
| 1988 | 5 | 0 |
| 1989 | 11 | 0 |
| 1990 | 11 | 0 |
| 1991 | 18 | 0 |
| 1992 | 17 | 0 |
| 1993 | 19 | 0 |
| 1994 | 24 | 0 |
| 1995 | 19 | 0 |
| 1996 | 18 | 0 |
| 1997 | 24 | 0 |
| 1998 | 16 | 0 |
| 1999 | 12 | 0 |
| 2000 | 23 | 0 |
| 2001 | 19 | 9 |
| 2002 | 14 | 15 |
| 2003 | 17 | 25 |
| 2004 | 21 | 26 |
| 2005 | 29 | 23 |
| 2006 | 13 | 19 |
| 2007 | 10 | 24 |
| 2008 | 13 | 20 |
| 2009 | 11 | 27 |
| 2010 | 9 | 35 |
| 2011 | 20 | 36 |
| 2012 | 14 | 41 |
| 2013 | 24 | 51 |
| 2014 | 32 | 46 |
| 2015 | 24 | 38 |
| 2016 | 33 | 44 |
| 2017 | 34 | 25 |
| 2018 | 31 | 21 |
| 2019 | 36 | 24 |
| 2020 | 18 | 16 |
| 2021 | 14 | 18 |
| 2022 | 12 | 28 |
| 2023 | 16 | 21 |
| 2024 | 15 | 23 |
| 2025 | 23 | 32 |
| 2026 | 11 | 15 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
- F23C 9/006The recirculation taking place in the combustion chamber255
- F23C 9/08Combustion apparatus characterised by arrangements for returning combustion products or flue gases173
- F23C 9/003Combustion apparatus characterised by arrangements for returning combustion products or flue gases83
- F23C 9/06Combustion apparatus characterised by arrangements for returning combustion products or flue gases54
Recent patents
- Refractory block for low NOx burners with internal flue gas recirculation6 Oct 2026US 12,753,916 B2Honeywell International Inc.
- CLC method and plant with recovery of gaseous oxygen produced by an oxygen carrier29 Sep 2026US 12,747,859 B2Ifp Energies Nouvelles
- Process burner with distal flame holder25 Aug 2026US 12,716,582 B2
- Metal curing ovens with quick heat-up and cool-down, and processes of using same14 Jul 2026US 12,678,823 B2EPCON Industrial Services, LP
- 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.
- 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
- A burner and a process for combusting metal powder3 Sep 2026US 2026/0258942 A1
- Burner assembly for gaseous fuels27 Aug 2026US 2026/0251296 A1Clearsign Technologies Corporation
- Building Emission Processing and/or Sequestration Systems and Methods27 Aug 2026US 2026/0251297 A1Carbonquest, Inc.
Most cited
By later US patents
- Recuperated gas turbine engine system and method employing catalytic combustion170US 7,007,487 B2MES International, Inc. · 2006
- Combustion method and apparatus for producing a carbon dioxide end product164US 6,202,574 B1ABB Alstom Power Inc. · 2001
- Low NO.sub.x formation burner apparatus and methods152US 5,195,884 AJohn Zink Company, a Division of Koch Engineering Company, Inc. · 1993
- Process for generating power including a combustion process142US 6,298,664 B1Norsk Hydro ASA · 2001
- Low NO.sub.x burner assemblies133US 5,073,105 ACallidus Technologies, Inc. · 1991