F23N 2231/26
Fail safe: for clogging air inlet
Official title: for clogging air inlet
F23N2231/26 (Fail safe: for clogging air inlet) appears on 33 US grants and 25 published applications in this corpus.
Search patents in F23N- Granted patents
- 33
- Published applications
- 25
- Assignees
- 25
- Inventors
- 85
- Latest grant
- 29 Apr 2025
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1983 | 2 | 0 |
| 1984 | 0 | 0 |
| 1985 | 0 | 0 |
| 1986 | 1 | 0 |
| 1987 | 1 | 0 |
| 1988 | 1 | 0 |
| 1989 | 0 | 0 |
| 1990 | 1 | 0 |
| 1991 | 1 | 0 |
| 1992 | 1 | 0 |
| 1993 | 1 | 0 |
| 1994 | 0 | 0 |
| 1995 | 0 | 0 |
| 1996 | 0 | 0 |
| 1997 | 0 | 0 |
| 1998 | 0 | 0 |
| 1999 | 1 | 0 |
| 2000 | 2 | 0 |
| 2001 | 1 | 0 |
| 2002 | 1 | 3 |
| 2003 | 4 | 1 |
| 2004 | 0 | 0 |
| 2005 | 0 | 1 |
| 2006 | 0 | 2 |
| 2007 | 2 | 1 |
| 2008 | 0 | 2 |
| 2009 | 0 | 0 |
| 2010 | 1 | 6 |
| 2011 | 1 | 1 |
| 2012 | 1 | 2 |
| 2013 | 3 | 1 |
| 2014 | 3 | 1 |
| 2015 | 0 | 0 |
| 2016 | 0 | 0 |
| 2017 | 0 | 0 |
| 2018 | 0 | 0 |
| 2019 | 1 | 0 |
| 2020 | 0 | 0 |
| 2021 | 0 | 0 |
| 2022 | 0 | 1 |
| 2023 | 1 | 2 |
| 2024 | 0 | 1 |
| 2025 | 2 | 0 |
By publication year. Applications have been published since 2001.
Recent patents
- Fan apparatus29 Apr 2025US 12,287,091 B2Rinnai Corporation
- Systems and methods for operating a furnace18 Mar 2025US 12,253,284 B2Trane International Inc.
- Systems and methods for operating a furnace11 Apr 2023US 11,624,529 B2Trane International Inc.
- Electronic detection of vent blockage and blower malfunction in temperature control systems22 Oct 2019US 10,451,303 B1Rheem Manufacturing Company
- Combustion apparatus and method for combustion control thereof2 Sep 2014US 8,821,154 B2Purpose Co., Ltd.
- Method and controller for operating a gas burner appliance and gas burner appliance11 Jul 2024US 2024/0230084 A1Pittway Sarl
- Systems and methods for operating a furnace6 Jul 2023US 2023/0213240 A1Trane International Inc.
- Fan apparatus8 Jun 2023US 2023/0175693 A1Rinnai Corporation
- Systems and Methods for Operating a Furnace13 Jan 2022US 2022/0011018 A1Trane International Inc.
- Duct grease deposit detection devices, systems, and methods30 Oct 2014US 2014/0318284 A1Oy Halton Group Ltd.
Most cited
By later US patents
- Advanced proof-of-rotation switch52US 5,222,888 AEmerson Electric Co. · 1993
- Home heating system draft controller45US 5,039,006 A1991
- Integrated control system using a microprocessor42US 4,421,268 AHoneywell Inc. · 1983
- Furnace diagnostic system37US 6,535,838 B2Robertshaw Controls Company · 2003
- Integrated control system using a microprocessor35US 4,373,662 AHoneywell Inc. · 1983