F23N 2231/20
Warning devices
F23N2231/20 (Warning devices) appears on 156 US grants and 68 published applications in this corpus.
Search patents in F23N- Granted patents
- 156
- Published applications
- 68
- Assignees
- 90
- Inventors
- 284
- Latest grant
- 22 Sep 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 3 | 0 |
| 1977 | 2 | 0 |
| 1978 | 2 | 0 |
| 1979 | 2 | 0 |
| 1980 | 3 | 0 |
| 1981 | 7 | 0 |
| 1982 | 3 | 0 |
| 1983 | 4 | 0 |
| 1984 | 5 | 0 |
| 1985 | 1 | 0 |
| 1986 | 1 | 0 |
| 1987 | 1 | 0 |
| 1988 | 3 | 0 |
| 1989 | 6 | 0 |
| 1990 | 1 | 0 |
| 1991 | 5 | 0 |
| 1992 | 3 | 0 |
| 1993 | 5 | 0 |
| 1994 | 4 | 0 |
| 1995 | 6 | 0 |
| 1996 | 6 | 0 |
| 1997 | 3 | 0 |
| 1998 | 3 | 0 |
| 1999 | 8 | 0 |
| 2000 | 4 | 0 |
| 2001 | 2 | 0 |
| 2002 | 4 | 4 |
| 2003 | 6 | 1 |
| 2004 | 2 | 2 |
| 2005 | 1 | 4 |
| 2006 | 5 | 5 |
| 2007 | 3 | 1 |
| 2008 | 1 | 3 |
| 2009 | 1 | 3 |
| 2010 | 2 | 3 |
| 2011 | 1 | 2 |
| 2012 | 2 | 6 |
| 2013 | 2 | 4 |
| 2014 | 1 | 1 |
| 2015 | 6 | 6 |
| 2016 | 4 | 3 |
| 2017 | 4 | 1 |
| 2018 | 5 | 3 |
| 2019 | 3 | 2 |
| 2020 | 1 | 2 |
| 2021 | 0 | 2 |
| 2022 | 2 | 4 |
| 2023 | 3 | 1 |
| 2024 | 1 | 4 |
| 2025 | 1 | 0 |
| 2026 | 2 | 1 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
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
- Furnace shut off device26 Aug 2025US 12,398,889 B1
- Monitoring and/or controlling solid fuel burning devices to reduce emissions and improve efficiency24 Sep 2024US 12,098,846 B2Mf Fire, Inc.
- Systems and methods of configuring a heating system26 Dec 2023US 11,852,340 B2Rheem Manufacturing Company
- Systems and Methods for Pre-Ignition Moisture Removal in Heating Alliances12 Feb 2026US 2026/0043543 A1Rheem Manufacturing Company
- Method and controller for operating a gas burner appliance and gas burner appliance11 Jul 2024US 2024/0230084 A1Pittway Sarl
- Real-time flare optimization using an edge device4 Jul 2024US 2024/0219023 A1Schlumberger Technology Corporation
- Burner for liquid fuel and method for operating such burner14 Mar 2024US 2024/0085017 A1Aduro A/S
- Systems and methods for automated furnace inducer sensor output verification8 Feb 2024US 2024/0044490 A1Rheem Manufacturing Company
Most cited
By later US patents
- 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
- Integrated furnace control and control self test122US 4,872,828 AHamilton Standard Controls, Inc. · 1989
- Furnace monitoring system97US 4,296,727 AMicro-Burner Systems Corporation · 1981
- Gas heater with alarm system91US 5,807,098 ADESA International, Inc. · 1998