F23N 2235/02
Air or combustion gas valves or dampers
F23N2235/02 (Air or combustion gas valves or dampers) appears on 380 US grants and 174 published applications in this corpus.
Search patents in F23N- Granted patents
- 380
- Published applications
- 174
- Assignees
- 241
- Inventors
- 692
- Latest grant
- 7 Jul 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 7 | 0 |
| 1977 | 8 | 0 |
| 1978 | 9 | 0 |
| 1979 | 6 | 0 |
| 1980 | 16 | 0 |
| 1981 | 27 | 0 |
| 1982 | 7 | 0 |
| 1983 | 19 | 0 |
| 1984 | 20 | 0 |
| 1985 | 14 | 0 |
| 1986 | 7 | 0 |
| 1987 | 6 | 0 |
| 1988 | 12 | 0 |
| 1989 | 11 | 0 |
| 1990 | 8 | 0 |
| 1991 | 12 | 0 |
| 1992 | 6 | 0 |
| 1993 | 7 | 0 |
| 1994 | 7 | 0 |
| 1995 | 7 | 0 |
| 1996 | 7 | 0 |
| 1997 | 5 | 0 |
| 1998 | 4 | 0 |
| 1999 | 12 | 0 |
| 2000 | 5 | 0 |
| 2001 | 11 | 3 |
| 2002 | 4 | 3 |
| 2003 | 4 | 5 |
| 2004 | 6 | 8 |
| 2005 | 1 | 4 |
| 2006 | 4 | 5 |
| 2007 | 4 | 5 |
| 2008 | 2 | 4 |
| 2009 | 1 | 10 |
| 2010 | 0 | 3 |
| 2011 | 3 | 7 |
| 2012 | 4 | 10 |
| 2013 | 3 | 10 |
| 2014 | 5 | 10 |
| 2015 | 8 | 7 |
| 2016 | 7 | 2 |
| 2017 | 10 | 8 |
| 2018 | 2 | 2 |
| 2019 | 7 | 5 |
| 2020 | 4 | 11 |
| 2021 | 4 | 6 |
| 2022 | 11 | 16 |
| 2023 | 4 | 7 |
| 2024 | 6 | 8 |
| 2025 | 8 | 7 |
| 2026 | 8 | 8 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Hydronic surface heater with auto-adjusting burner7 Jul 2026US 12,674,578 B2Wacker Neuson America Corporation
- Device and method for controlling a fuel-oxidizer mixture for a premix gas burner14 Apr 2026US 12,601,477 B2Bertelli & Partners S.R.L.
- Electronic control device and flow rate measurement system17 Mar 2026US 12,578,091 B2Hitachi Astemo, Ltd.
- Power output determination by way of a fuel parameter3 Mar 2026US 12,565,994 B2Siemens Aktiengesellschaft
- Premixing apparatus3 Mar 2026US 12,565,997 B2Rinnai Corporation
- Manual air control device for gas burner6 Aug 2026US 2026/0227065 A1SNT Co., Ltd.
- Venturi for boiler2 Jul 2026US 2026/0185704 A1Kyungdong Navien Co., Ltd.
- Premixer and gas device2 Jul 2026US 2026/0185709 A1Guangdong Midea Kitchen and Bath Appliances Mfg. Co., Ltd.
- Method of controlling inverter for blower of industrial boiler based on iot and industrial boiler using the same21 May 2026US 2026/0139827 A1DAELIM ROYAL EnP CO., LTD.
- Burner body with variable gas outlet area30 Apr 2026US 2026/0117969 A1Ariston S.P.A.
Most cited
By later US patents
- Non-recovery coke oven gas combustion system135US 5,968,320 AStelco Inc. · 1999
- Furnace monitoring system97US 4,296,727 AMicro-Burner Systems Corporation · 1981
- System and process for controlling the flow of air and fuel to a burner92US 4,645,450 AControl Techtronics, Inc. · 1987
- Combustion air regulating apparatus for use with induced draft furnaces90US 5,993,195 ACarrier Corporation · 1999
- Method and apparatus for optical flame control of combustion burners80US 6,045,353 AAmerican Air Liquide, Inc. · 2000