F23R 3/42
Continuous combustion chambers using liquid or gaseous fuel: characterised by the arrangement
Official title: characterised by the arrangement or form of the flame tubes or combustion chambers
F23R3/42 (Continuous combustion chambers using liquid or gaseous fuel: characterised by the arrangement) appears on 2,167 US grants and 2,278 published applications in this corpus.
Search patents in F23R- Granted patents
- 2,167
- Published applications
- 2,278
- Assignees
- 289
- Inventors
- 3,132
- Latest grant
- 6 Oct 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 4 | 0 |
| 1977 | 7 | 0 |
| 1978 | 10 | 0 |
| 1979 | 6 | 0 |
| 1980 | 12 | 0 |
| 1981 | 6 | 0 |
| 1982 | 5 | 0 |
| 1983 | 9 | 0 |
| 1984 | 8 | 0 |
| 1985 | 5 | 0 |
| 1986 | 6 | 0 |
| 1987 | 8 | 0 |
| 1988 | 7 | 0 |
| 1989 | 9 | 0 |
| 1990 | 7 | 0 |
| 1991 | 14 | 0 |
| 1992 | 23 | 0 |
| 1993 | 21 | 0 |
| 1994 | 37 | 0 |
| 1995 | 21 | 0 |
| 1996 | 17 | 0 |
| 1997 | 11 | 0 |
| 1998 | 13 | 0 |
| 1999 | 20 | 0 |
| 2000 | 16 | 0 |
| 2001 | 21 | 4 |
| 2002 | 31 | 31 |
| 2003 | 22 | 18 |
| 2004 | 31 | 50 |
| 2005 | 31 | 53 |
| 2006 | 42 | 36 |
| 2007 | 21 | 63 |
| 2008 | 26 | 39 |
| 2009 | 33 | 62 |
| 2010 | 41 | 68 |
| 2011 | 38 | 64 |
| 2012 | 62 | 101 |
| 2013 | 53 | 97 |
| 2014 | 66 | 164 |
| 2015 | 88 | 135 |
| 2016 | 107 | 167 |
| 2017 | 88 | 169 |
| 2018 | 116 | 174 |
| 2019 | 160 | 155 |
| 2020 | 198 | 137 |
| 2021 | 148 | 78 |
| 2022 | 114 | 93 |
| 2023 | 87 | 81 |
| 2024 | 94 | 104 |
| 2025 | 83 | 69 |
| 2026 | 64 | 66 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
- F23R 3/60Support structures955
- F23R 3/50Combustion chambers comprising an annular flame tube within an annular casing633
- F23R 3/46Combustion chambers comprising an annular arrangement of several essentially tubular flame tubes345
- F23R 3/54Reverse-flow combustion chambers244
- F23R 3/44Combustion chambers comprising a single tubular flame tube within a tubular casing90
- F23R 3/58Cyclone or vortex type combustion chambers82
- F23R 3/52Toroidal combustion chambers72
- F23R 3/425Combustion chambers comprising a tangential or helicoidal arrangement of the flame tubes48
All 9 subgroupsShow fewer
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Most cited
By later US patents
- Closed-cycle gas turbine chemical processor147US 4,528,811 AGeneral Electric Company · 1985
- Microturbomachinery145US 5,932,940 AMassachusetts Institute of Technology · 1999
- Mixing ducts for a gas-turbine annular combustion chamber142US 5,839,283 AABB Research Ltd. · 1998
- Gas turbine combustor127US 4,898,001 AHitachi, Ltd. · 1990
- Low emissions combustion system for a gas turbine engine125US 6,016,658 ACapstone Turbine Corporation · 2000