F23
Combustion apparatus
Official title: Combustion apparatus; combustion processes
F23 (Combustion apparatus) appears on 32,884 US grants and 25,324 published applications in this corpus.
Search patents in F23- Granted patents
- 32,884
- Published applications
- 25,324
- Assignees
- 8,577
- Inventors
- 45,466
- Latest grant
- 6 Oct 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 442 | 0 |
| 1977 | 426 | 0 |
| 1978 | 431 | 0 |
| 1979 | 350 | 0 |
| 1980 | 429 | 0 |
| 1981 | 557 | 0 |
| 1982 | 461 | 0 |
| 1983 | 512 | 0 |
| 1984 | 633 | 0 |
| 1985 | 572 | 0 |
| 1986 | 501 | 0 |
| 1987 | 529 | 0 |
| 1988 | 520 | 0 |
| 1989 | 574 | 0 |
| 1990 | 589 | 0 |
| 1991 | 516 | 0 |
| 1992 | 569 | 0 |
| 1993 | 603 | 0 |
| 1994 | 653 | 0 |
| 1995 | 584 | 0 |
| 1996 | 549 | 0 |
| 1997 | 502 | 0 |
| 1998 | 647 | 0 |
| 1999 | 670 | 0 |
| 2000 | 733 | 0 |
| 2001 | 706 | 195 |
| 2002 | 634 | 588 |
| 2003 | 629 | 692 |
| 2004 | 577 | 840 |
| 2005 | 558 | 834 |
| 2006 | 486 | 810 |
| 2007 | 354 | 885 |
| 2008 | 337 | 839 |
| 2009 | 427 | 990 |
| 2010 | 564 | 1255 |
| 2011 | 558 | 1174 |
| 2012 | 693 | 1198 |
| 2013 | 850 | 1263 |
| 2014 | 865 | 1407 |
| 2015 | 955 | 1276 |
| 2016 | 1002 | 1410 |
| 2017 | 1004 | 1263 |
| 2018 | 1010 | 1185 |
| 2019 | 1207 | 1107 |
| 2020 | 1154 | 1100 |
| 2021 | 930 | 886 |
| 2022 | 908 | 940 |
| 2023 | 776 | 919 |
| 2024 | 806 | 929 |
| 2025 | 770 | 756 |
| 2026 | 572 | 583 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subclasses
Granted patents
- F23DBurners8,563
- F23RGenerating combustion products of high pressure or high velocity8,376
- F23CMethods or apparatus for combustion using fluid fuel or solid fuel suspended5,940
- F23NRegulating or controlling combustion5,240
- F23GCremation furnaces4,917
- F23JRemoval or treatment of combustion products or combustion residues3,870
- F23LSupplying air or non-combustible liquids or gases to combustion apparatus in general3,229
- F23QIgnition2,698
Recent patents
- Condensation dedust-demister set6 Oct 2026US 12,752,224 B2
- Combustion mode switching engine6 Oct 2026US 12,753,730 B2PD AeroSpace, LTD.
- Refractory block for low NOx burners with internal flue gas recirculation6 Oct 2026US 12,753,916 B2Honeywell International Inc.
- Gas heater6 Oct 2026US 12,753,917 B2Baide Home (Xiamen) Outdoor Products Co., Ltd.
- Burner and method for hydrogen combustion with enhanced luminosity6 Oct 2026US 12,753,918 B2Bloom Engineering Company, Inc.
- Method and device for separating a carbon dioxide-containing gas by partial condensation and/or distillation and/or solidification8 Oct 2026US 2026/0306989 A1L Air Liquide, Societe Anonyme Pour L'Etude et L'Exploitation des Procedes Georges Claude
- Process and apparatus for separating carbon dioxide from a flue gas stream8 Oct 2026US 2026/0306999 A1L Air Liquide, Societe Anonyme Pour L'Etude et L'Exploitation des Procedes Georges Claude
- Gas turbine engine fuel system8 Oct 2026US 2026/0309083 A1General Electric Company
- Gas turbine operation method and gas turbine equipment capable of executing same8 Oct 2026US 2026/0309099 A1Mitsubishi Heavy Industries, Ltd.
- Apparatus for feeding solid fuel feedstock into a furnace8 Oct 2026US 2026/0309324 A1British American Tobacco (Investments) Limited
Most cited
By later US patents
- Electronically commutated motor1,555US 4,169,990 AGeneral Electric Company · 1979
- Programmer1,483US 4,213,562 A1980
- Arrangement for controlling fluid jets injected into a fluid stream1,018US 7,976,213 B2United Technologies Corporation · 2011
- Electronically commutated motor systems and control therefor813US 4,459,519 AGeneral Electric Company · 1984
- Membrane based fuel deoxygenator394US 6,315,815 B1United Technologies Corporation · 2001