F23R 3/28
Continuous combustion chambers using liquid or gaseous fuel: characterised by the fuel
Official title: characterised by the fuel supply (burners F23D)
F23R3/28 (Continuous combustion chambers using liquid or gaseous fuel: characterised by the fuel) appears on 4,199 US grants and 4,493 published applications in this corpus.
Search patents in F23R- Granted patents
- 4,199
- Published applications
- 4,493
- Assignees
- 446
- Inventors
- 4,755
- Latest grant
- 6 Oct 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 22 | 0 |
| 1977 | 18 | 0 |
| 1978 | 14 | 0 |
| 1979 | 10 | 0 |
| 1980 | 20 | 0 |
| 1981 | 24 | 0 |
| 1982 | 13 | 0 |
| 1983 | 11 | 0 |
| 1984 | 16 | 0 |
| 1985 | 10 | 0 |
| 1986 | 10 | 0 |
| 1987 | 9 | 0 |
| 1988 | 17 | 0 |
| 1989 | 15 | 0 |
| 1990 | 33 | 0 |
| 1991 | 26 | 0 |
| 1992 | 38 | 0 |
| 1993 | 45 | 0 |
| 1994 | 57 | 0 |
| 1995 | 34 | 0 |
| 1996 | 28 | 0 |
| 1997 | 46 | 0 |
| 1998 | 40 | 0 |
| 1999 | 38 | 0 |
| 2000 | 39 | 0 |
| 2001 | 57 | 18 |
| 2002 | 72 | 51 |
| 2003 | 54 | 61 |
| 2004 | 69 | 108 |
| 2005 | 72 | 97 |
| 2006 | 80 | 75 |
| 2007 | 37 | 119 |
| 2008 | 41 | 93 |
| 2009 | 60 | 146 |
| 2010 | 77 | 242 |
| 2011 | 96 | 169 |
| 2012 | 132 | 217 |
| 2013 | 165 | 258 |
| 2014 | 151 | 293 |
| 2015 | 199 | 205 |
| 2016 | 234 | 273 |
| 2017 | 162 | 282 |
| 2018 | 177 | 250 |
| 2019 | 222 | 226 |
| 2020 | 233 | 170 |
| 2021 | 215 | 165 |
| 2022 | 211 | 179 |
| 2023 | 186 | 198 |
| 2024 | 218 | 213 |
| 2025 | 203 | 206 |
| 2026 | 143 | 179 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
- F23R 3/286Having fuel-air premixing devices1,925
- F23R 3/34Feeding into different combustion zones1,648
- F23R 3/283Attaching or cooling of fuel injecting means including supports for fuel injectors1,050
- F23R 3/36Supply of different fuels540
- F23R 3/30Comprising fuel prevapourising devices263
- F23R 3/38Comprising rotary fuel injection means79
Recent patents
- Turbine engine fuel injector with non-circular nozzle passage6 Oct 2026US 12,753,922 B2Rtx Corporation
- Gas turbine engine including hydrogen-compatible fuel-air mixer with multi-jet mixing tube6 Oct 2026US 12,753,923 B2General Electric Company
- Coated components for coke abatement in gas turbine engines6 Oct 2026US 12,753,924 B2General Electric Company
- Combustion section for a turbine engine29 Sep 2026US 12,747,862 B2General Electric Company
- Dual fuel combustor for a turbine engine29 Sep 2026US 12,747,863 B2General Electric Company
- Gas turbine operation method and gas turbine equipment capable of executing same8 Oct 2026US 2026/0309099 A1Mitsubishi Heavy Industries, Ltd.
- Swirler for a fuel nozzle assembly of a gas turbine engine8 Oct 2026US 2026/0309328 A1General Electric Company
- Device and method for injecting a hydrogen-air mixture for a turbine engine burner8 Oct 2026US 2026/0309329 A1Safran
- Annular vortex combustor for a turbine engine8 Oct 2026US 2026/0309330 A1General Electric Company
- Metal-based fuel and fuel delivery systems1 Oct 2026US 2026/0298136 A1Rtx Corporation
Most cited
By later US patents
- Nested core gas turbine engine195US 7,219,490 B2D-Star Engineering · 2007
- Premix combustor178US 4,100,733 AUnited Technologies Corporation · 1978
- Trifluid reactor177US 7,523,603 B2Vast Power Portfolio, LLC · 2009
- Methods and apparatus for a combustion turbine fuel recirculation system and nitrogen purge system173US 7,721,521 B2General Electric Company · 2010
- Staged combustion of a low heating value fuel gas for driving a gas turbine166US 6,201,029 B1Marathon Oil Company · 2001