F23Q 9/12
To permit the supply to the main burner in dependence upon existence
Official title: to permit the supply to the main burner in dependence upon existence of pilot flame
F23Q9/12 (To permit the supply to the main burner in dependence upon existence) appears on 57 US grants and 19 published applications in this corpus.
Search patents in F23Q- Granted patents
- 57
- Published applications
- 19
- Assignees
- 30
- Inventors
- 74
- Latest grant
- 28 Jan 2025
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 4 | 0 |
| 1977 | 2 | 0 |
| 1978 | 9 | 0 |
| 1979 | 4 | 0 |
| 1980 | 3 | 0 |
| 1981 | 4 | 0 |
| 1982 | 0 | 0 |
| 1983 | 1 | 0 |
| 1984 | 3 | 0 |
| 1985 | 3 | 0 |
| 1986 | 2 | 0 |
| 1987 | 1 | 0 |
| 1988 | 2 | 0 |
| 1989 | 1 | 0 |
| 1990 | 1 | 0 |
| 1991 | 1 | 0 |
| 1992 | 1 | 0 |
| 1993 | 0 | 0 |
| 1994 | 0 | 0 |
| 1995 | 0 | 0 |
| 1996 | 0 | 0 |
| 1997 | 0 | 0 |
| 1998 | 0 | 0 |
| 1999 | 0 | 0 |
| 2000 | 0 | 0 |
| 2001 | 1 | 0 |
| 2002 | 0 | 0 |
| 2003 | 0 | 0 |
| 2004 | 1 | 0 |
| 2005 | 0 | 0 |
| 2006 | 0 | 0 |
| 2007 | 0 | 0 |
| 2008 | 0 | 0 |
| 2009 | 0 | 0 |
| 2010 | 0 | 1 |
| 2011 | 0 | 0 |
| 2012 | 0 | 0 |
| 2013 | 0 | 1 |
| 2014 | 0 | 1 |
| 2015 | 0 | 2 |
| 2016 | 0 | 1 |
| 2017 | 4 | 1 |
| 2018 | 1 | 2 |
| 2019 | 1 | 2 |
| 2020 | 2 | 3 |
| 2021 | 1 | 2 |
| 2022 | 1 | 2 |
| 2023 | 2 | 0 |
| 2024 | 0 | 0 |
| 2025 | 1 | 1 |
By publication year. Applications have been published since 2001.
Subgroups
Granted patents
Recent patents
- Pilot assemblies and methods for enclosed ground flares and elevated flare stacks28 Jan 2025US 12,209,748 B2Surefire Pilotless Burner Systems LLC
- System and method for operational control of a water heater apparatus with a combustible gas burner8 Aug 2023US 11,719,437 B2Sit S.P.A.
- Water-heating apparatus comprising combustible gas burner, in particular a storage water heater20 Jun 2023US 11,680,707 B2Sit S.P.A.
- Standing pilot igniter for oilfield separators20 Sep 2022US 11,448,399 B2Dragonfire Technologies, Inc.
- Universal housing for a hot surface igniter6 Apr 2021US 10,969,110 B2
- Water heater with intermittent pilot and damper control11 Dec 2025US 2025/0377098 A1Bradford White Corporation
- Pilot assemblies and methods for enclosed ground flares and elevated flare stacks19 May 2022US 2022/0154931 A1Surefire Pilotless Burner Systems LLC
- Water-heating apparatus comprising combustible gas burner, in particular a storage water heater3 Feb 2022US 2022/0034508 A1Sit S.P.A.
- Gas burner assembly4 Nov 2021US 2021/0341177 A1
- System and method for operational control of a water heater apparatus with a combustible gas burner24 Jun 2021US 2021/0190316 A1Sit S.P.A.
Most cited
By later US patents
- Burner ignition system132US 4,717,333 AAdvanced Mechanical Technology, Inc. · 1988
- Self-contained electric igniter with rechargeable battery54US 4,131,413 AA. O. Smith Corporation · 1978
- Safety device for gas burners46US 4,242,080 AHoneywell Inc. · 1980
- Fuel ignition control system42US 4,242,079 AJohnson Controls GmbH · 1980
- Safety gas valve with latch35US 4,442,853 AHoneywell Inc. · 1984