F23Q 9/02
Without interlock with main fuel supply
Official title: without interlock with main fuel supply
F23Q9/02 (Without interlock with main fuel supply) appears on 66 US grants and 49 published applications in this corpus.
Search patents in F23Q- Granted patents
- 66
- Published applications
- 49
- Assignees
- 48
- Inventors
- 112
- Latest grant
- 18 Nov 2025
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 5 | 0 |
| 1977 | 0 | 0 |
| 1978 | 0 | 0 |
| 1979 | 2 | 0 |
| 1980 | 1 | 0 |
| 1981 | 2 | 0 |
| 1982 | 3 | 0 |
| 1983 | 4 | 0 |
| 1984 | 2 | 0 |
| 1985 | 1 | 0 |
| 1986 | 1 | 0 |
| 1987 | 0 | 0 |
| 1988 | 0 | 0 |
| 1989 | 1 | 0 |
| 1990 | 1 | 0 |
| 1991 | 1 | 0 |
| 1992 | 1 | 0 |
| 1993 | 0 | 0 |
| 1994 | 0 | 0 |
| 1995 | 0 | 0 |
| 1996 | 1 | 0 |
| 1997 | 2 | 0 |
| 1998 | 0 | 0 |
| 1999 | 2 | 0 |
| 2000 | 4 | 0 |
| 2001 | 1 | 0 |
| 2002 | 0 | 1 |
| 2003 | 2 | 0 |
| 2004 | 0 | 0 |
| 2005 | 0 | 1 |
| 2006 | 0 | 3 |
| 2007 | 1 | 5 |
| 2008 | 0 | 1 |
| 2009 | 1 | 3 |
| 2010 | 1 | 4 |
| 2011 | 3 | 5 |
| 2012 | 3 | 8 |
| 2013 | 2 | 2 |
| 2014 | 3 | 1 |
| 2015 | 2 | 4 |
| 2016 | 4 | 0 |
| 2017 | 1 | 3 |
| 2018 | 1 | 2 |
| 2019 | 2 | 0 |
| 2020 | 0 | 2 |
| 2021 | 1 | 1 |
| 2022 | 2 | 2 |
| 2023 | 0 | 0 |
| 2024 | 1 | 1 |
| 2025 | 1 | 0 |
By publication year. Applications have been published since 2001.
Subgroups
Granted patents
Recent patents
- Automatically igniting gas flares18 Nov 2025US 12,474,049 B2Saudi Arabian Oil Company
- Spark ignited pilot for gas burner2 Apr 2024US 11,946,641 B2Solaronics, Inc.
- Premix burner and heat treatment facility for metal plate30 Aug 2022US 11,428,408 B2Primetals Technologies Japan, Ltd.
- Flare pilot and flare pilot with ignitor assembly3 May 2022US 11,320,143 B2Flaretech Inc.
- Automatic pilot lighting systems24 Aug 2021US 11,098,898 B2Emerson Electric Co.
- Automatically Igniting Gas Flares27 Jun 2024US 2024/0210033 A1Saudi Arabian Oil Company
- Spark Ignited Pilot For Gas Burner1 Dec 2022US 2022/0381431 A1Solaronics, Inc.
- Spark system for igniters22 Sep 2022US 2022/0302683 A1Saudi Arabian Oil Company
- Premix burner and heat treatment facility for metal plate6 May 2021US 2021/0131664 A1Primetals Technologies Japan, Ltd.
- Automatic Pilot Lighting Systems2 Apr 2020US 2020/0103110 A1Emerson Electric Co.
Most cited
By later US patents
- Dual fuel heater68US 7,607,426 B22009
- Apparatus for controlling the supply of gas to and heat from unvented gas heating appliances54US 5,674,065 AOP S.r.l. · 1997
- Heater configured to operate with a first or second fuel49US 7,677,236 B22010
- Dual fuel heater43US 7,967,006 B22011
- Heater configured to operate with a first or second fuel42US 7,967,007 B22011