F24H 9/2042
Preventing or detecting the return of combustion gases
Official title: {Preventing or detecting the return of combustion gases}
F24H9/2042 (Preventing or detecting the return of combustion gases) appears on 54 US grants and 51 published applications in this corpus.
Search patents in F24H- Granted patents
- 54
- Published applications
- 51
- Assignees
- 27
- Inventors
- 109
- Latest grant
- 7 Apr 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1980 | 1 | 0 |
| 1981 | 1 | 0 |
| 1982 | 1 | 0 |
| 1983 | 0 | 0 |
| 1984 | 0 | 0 |
| 1985 | 0 | 0 |
| 1986 | 0 | 0 |
| 1987 | 0 | 0 |
| 1988 | 0 | 0 |
| 1989 | 0 | 0 |
| 1990 | 0 | 0 |
| 1991 | 0 | 0 |
| 1992 | 1 | 0 |
| 1993 | 0 | 0 |
| 1994 | 1 | 0 |
| 1995 | 0 | 0 |
| 1996 | 3 | 0 |
| 1997 | 0 | 0 |
| 1998 | 0 | 0 |
| 1999 | 1 | 0 |
| 2000 | 1 | 0 |
| 2001 | 0 | 0 |
| 2002 | 1 | 1 |
| 2003 | 0 | 2 |
| 2004 | 3 | 2 |
| 2005 | 3 | 2 |
| 2006 | 0 | 0 |
| 2007 | 1 | 0 |
| 2008 | 0 | 0 |
| 2009 | 0 | 2 |
| 2010 | 0 | 3 |
| 2011 | 2 | 2 |
| 2012 | 3 | 1 |
| 2013 | 0 | 1 |
| 2014 | 0 | 0 |
| 2015 | 1 | 3 |
| 2016 | 0 | 1 |
| 2017 | 1 | 2 |
| 2018 | 3 | 9 |
| 2019 | 9 | 4 |
| 2020 | 3 | 7 |
| 2021 | 1 | 0 |
| 2022 | 6 | 0 |
| 2023 | 2 | 0 |
| 2024 | 2 | 6 |
| 2025 | 2 | 3 |
| 2026 | 1 | 0 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Air pressure detection device, combustor, gas water heater, method and apparatus for controlling gas water heater, and computer-readable storage medium7 Apr 2026US 12,595,933 B2Midea Group Co., Ltd.
- Portable water heater26 Aug 2025US 12,398,918 B2Zhongshan Powtek Appliances Mfg., Ltd.
- Carbon monoxide leak alerting device and method4 Feb 2025US 12,215,895 B2Nanokem Co., Ltd.
- System and method for discharging carbon monoxide by using carbon monoxide leakage alarm device15 Oct 2024US 12,117,206 B2Nanokem Co., Ltd.
- Systems for reverse airflow damage prevention in appliances15 Oct 2024US 12,117,211 B2Haier US Appliance Solutions, Inc.
- Baffle device for flue and gas water heating device1 May 2025US 2025/0137688 A1
- Sensor for water heaters10 Apr 2025US 2025/0116427 A1Pittway Sarl
- Water leakage detection and mitigation system and method13 Mar 2025US 2025/0085025 A1
- Systems for reverse airflow damage prevention in appliances6 Jun 2024US 2024/0183581 A1Haier US Appliance Solutions, Inc.
- Carbon monoxide leak alerting device and method4 Apr 2024US 2024/0110727 A1Nanokem Co., Ltd.
Most cited
By later US patents
- Gas appliance detection apparatus65US 5,280,802 A1994
- Power vent water heater with electronic control system60US 6,053,130 AAmerican Water Heater Company · 2000
- Flue draft malfunction detector and shut-off control for oil burner furnaces49US 5,567,143 A1996
- Gas vent and burner monitoring system44US 5,531,214 A1996
- Fuel-fired heating appliance with combustion chamber temperature-sensing combustion air shutoff system22US 6,497,200 B2The Water Heater Industry Joint Research and Development Consortium · 2002