F23N 2231/00
Fail safe
F23N2231/00 (Fail safe) appears on 586 US grants and 426 published applications in this corpus.
Search patents in F23N- Granted patents
- 586
- Published applications
- 426
- Assignees
- 283
- Inventors
- 1,185
- Latest grant
- 22 Sep 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 10 | 0 |
| 1977 | 10 | 0 |
| 1978 | 18 | 0 |
| 1979 | 8 | 0 |
| 1980 | 8 | 0 |
| 1981 | 14 | 0 |
| 1982 | 7 | 0 |
| 1983 | 9 | 0 |
| 1984 | 7 | 0 |
| 1985 | 1 | 0 |
| 1986 | 5 | 0 |
| 1987 | 5 | 0 |
| 1988 | 9 | 0 |
| 1989 | 12 | 0 |
| 1990 | 16 | 0 |
| 1991 | 16 | 0 |
| 1992 | 10 | 0 |
| 1993 | 12 | 0 |
| 1994 | 10 | 0 |
| 1995 | 13 | 0 |
| 1996 | 13 | 0 |
| 1997 | 8 | 0 |
| 1998 | 9 | 0 |
| 1999 | 19 | 0 |
| 2000 | 11 | 0 |
| 2001 | 6 | 1 |
| 2002 | 13 | 12 |
| 2003 | 14 | 5 |
| 2004 | 7 | 12 |
| 2005 | 10 | 16 |
| 2006 | 6 | 18 |
| 2007 | 10 | 17 |
| 2008 | 5 | 17 |
| 2009 | 5 | 17 |
| 2010 | 12 | 30 |
| 2011 | 7 | 32 |
| 2012 | 16 | 28 |
| 2013 | 19 | 19 |
| 2014 | 14 | 18 |
| 2015 | 21 | 21 |
| 2016 | 16 | 25 |
| 2017 | 25 | 19 |
| 2018 | 19 | 19 |
| 2019 | 20 | 13 |
| 2020 | 9 | 17 |
| 2021 | 14 | 15 |
| 2022 | 10 | 19 |
| 2023 | 19 | 13 |
| 2024 | 13 | 13 |
| 2025 | 10 | 8 |
| 2026 | 6 | 2 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
- F23N 2231/20Warning devicesIndexing code156
- F23N 2231/06Fail safe: for flame failuresIndexing code108
- F23N 2231/10Fail safe: for component failuresIndexing code107
- F23N 2231/18Detecting fluid leaksIndexing code77
- F23N 2231/12Fail safe: for ignition failuresIndexing code55
- F23N 2231/28Preventing flash-back or blow-backIndexing code51
- F23N 2231/04Fail safe: for electrical power failuresIndexing code49
- F23N 2231/02Fail safe: using electric energy accumulatorsIndexing code45
All 13 subgroupsShow fewer
Recent patents
- Systems and methods for automated furnace inducer sensor output verification22 Sep 2026US 12,742,548 B2Rheem Manufacturing Company
- Real-time flare optimization using an edge device12 May 2026US 12,624,834 B2Schlumberger Technology Corporation
- Detection apparatus and combustion system5 May 2026US 12,618,560 B2Yokogawa Electric Corporation
- Atomization burner with flexible fire rate14 Apr 2026US 12,601,481 B2Babington Technology, Inc.
- Closed-loop control of a combustion apparatus3 Mar 2026US 12,565,995 B2Siemens Aktiengesellschaft
- Systems and Methods for Pre-Ignition Moisture Removal in Heating Alliances12 Feb 2026US 2026/0043543 A1Rheem Manufacturing Company
- Circuit including supercapacitor for supplying power to leak detection circuitry and controller in water heater12 Feb 2026US 2026/0043587 A1Ademco Inc.
- Gas ignition system for a gas cooking appliance11 Dec 2025US 2025/0377116 A1Haier US Appliance Solutions, Inc.
- Flame arrestor assembly for a gas water heater appliance30 Oct 2025US 2025/0334297 A1Haier US Appliance Solutions, Inc.
- Gas grills including bus bars16 Oct 2025US 2025/0318683 A1Weber-Stephen Products LLC
Most cited
By later US patents
- Hardwired or battery powered digital thermostat238US 6,315,211 B1Emerson Electric Co. · 2001
- Electronic thermostat with repetitive operation cycle202US 4,335,847 A1982
- Integrated appliance control system186US 6,059,195 ATridelta Industries, Inc. · 2000
- System for time programming of states by communicating time data via a continuously rotatable potentiometer153US 4,837,731 AHoneywell Inc. · 1989
- Ignition control system for a gas appliance131US 4,695,246 ALennox Industries Inc. · 1987