F23N
Regulating or controlling combustion
Official title: REGULATING OR CONTROLLING COMBUSTION (control devices specially adapted for combustion apparatus in which combustion takes place in a fluidised bed of fuel or other particles F23C10/28; condition responsive controls for regulating combustion in domestic stoves with open fires for solid fuel F24B1/187)
F23N (Regulating or controlling combustion) appears on 5,240 US grants and 4,388 published applications in this corpus.
Search patents in F23N- Granted patents
- 5,240
- Published applications
- 4,388
- Assignees
- 1,922
- Inventors
- 9,154
- Latest grant
- 22 Sep 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 76 | 0 |
| 1977 | 75 | 0 |
| 1978 | 87 | 0 |
| 1979 | 70 | 0 |
| 1980 | 66 | 0 |
| 1981 | 90 | 0 |
| 1982 | 70 | 0 |
| 1983 | 80 | 0 |
| 1984 | 100 | 0 |
| 1985 | 84 | 0 |
| 1986 | 72 | 0 |
| 1987 | 84 | 0 |
| 1988 | 72 | 0 |
| 1989 | 90 | 0 |
| 1990 | 76 | 0 |
| 1991 | 80 | 0 |
| 1992 | 70 | 0 |
| 1993 | 81 | 0 |
| 1994 | 78 | 0 |
| 1995 | 63 | 0 |
| 1996 | 65 | 0 |
| 1997 | 53 | 0 |
| 1998 | 79 | 0 |
| 1999 | 94 | 0 |
| 2000 | 75 | 0 |
| 2001 | 73 | 23 |
| 2002 | 77 | 79 |
| 2003 | 97 | 92 |
| 2004 | 90 | 148 |
| 2005 | 78 | 143 |
| 2006 | 89 | 143 |
| 2007 | 77 | 157 |
| 2008 | 65 | 138 |
| 2009 | 78 | 157 |
| 2010 | 91 | 206 |
| 2011 | 97 | 201 |
| 2012 | 115 | 215 |
| 2013 | 142 | 213 |
| 2014 | 168 | 227 |
| 2015 | 153 | 222 |
| 2016 | 171 | 230 |
| 2017 | 201 | 199 |
| 2018 | 178 | 200 |
| 2019 | 211 | 209 |
| 2020 | 181 | 217 |
| 2021 | 167 | 204 |
| 2022 | 178 | 198 |
| 2023 | 160 | 191 |
| 2024 | 139 | 164 |
| 2025 | 145 | 116 |
| 2026 | 89 | 96 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Main groups
Granted patents with any code in the group
- F23N 5/00Systems for controlling combustion3,364
- F23N 1/00Regulating fuel supply2,113
- F23N 2235/00Valves, nozzles or pumpsIndexing code1,379
- F23N 2225/00MeasuringIndexing code1,123
- F23N 2241/00ApplicationsIndexing code993
- F23N 2227/00Ignition or checkingIndexing code913
- F23N 2223/00Signal processingIndexing code843
- F23N 2237/00ControllingIndexing code802
All 15 main groupsShow fewer
- F23N 2229/00Flame sensorsIndexing code608
- F23N 2233/00VentilatorsIndexing code592
- F23N 2231/00Fail safeIndexing code586
- F23N 3/00Regulating air supply or draught541
- F23N 2221/00Pretreatment or prehandlingIndexing code286
- F23N 2239/00FuelsIndexing code277
- F23N 2900/00Special features of, or arrangements for controlling combustionIndexing code251
Recent patents
- Methods and systems for mixing fluids22 Sep 2026US 12,742,545 B2Ekona Power Inc.
- Convection conveyor oven manifold and damper system22 Sep 2026US 12,742,546 B2The Middleby Corporation
- Systems and methods for automated furnace inducer sensor output verification22 Sep 2026US 12,742,548 B2Rheem Manufacturing Company
- Systems and methods for controlling a variable gas valve15 Sep 2026US 12,736,230 B2Copeland Comfort Control LP
- Dual fuel valve8 Sep 2026US 12,729,851 B2GDA Valve Technology Co., Ltd.
- Apparatus for feeding solid fuel feedstock into a furnace8 Oct 2026US 2026/0309324 A1British American Tobacco (Investments) Limited
- Premixing device and combustion device comprising same8 Oct 2026US 2026/0309326 A1Noritz Corporation
- Furnace combustion gas sensing and control systems and methods1 Oct 2026US 2026/0298468 A1
- System and method for flashback arrest and flame temperature reduction for hydrogen-based fuels1 Oct 2026US 2026/0298469 A1Georgia Tech Research Corporation
- Dual fuel valve17 Sep 2026US 2026/0276192 A1GDA Valve Technology Co., Ltd.
Most cited
By later US patents
- Electronically commutated motor1,555US 4,169,990 AGeneral Electric Company · 1979
- Programmer1,483US 4,213,562 A1980
- Electronically commutated motor systems and control therefor813US 4,459,519 AGeneral Electric Company · 1984
- Graphical user interface system for a thermal comfort controller353US 6,595,430 B1Honeywell International Inc. · 2003
- Thermostat system communicating with a remote correspondent for receiving and displaying diverse information325US 6,619,555 B22003