F23N 2227/04
Prepurge
F23N2227/04 (Prepurge) appears on 111 US grants and 43 published applications in this corpus.
Search patents in F23N- Granted patents
- 111
- Published applications
- 43
- Assignees
- 61
- Inventors
- 222
- Latest grant
- 7 Jul 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 2 | 0 |
| 1977 | 2 | 0 |
| 1978 | 3 | 0 |
| 1979 | 7 | 0 |
| 1980 | 2 | 0 |
| 1981 | 8 | 0 |
| 1982 | 0 | 0 |
| 1983 | 9 | 0 |
| 1984 | 8 | 0 |
| 1985 | 0 | 0 |
| 1986 | 2 | 0 |
| 1987 | 3 | 0 |
| 1988 | 3 | 0 |
| 1989 | 2 | 0 |
| 1990 | 2 | 0 |
| 1991 | 3 | 0 |
| 1992 | 6 | 0 |
| 1993 | 2 | 0 |
| 1994 | 5 | 0 |
| 1995 | 1 | 0 |
| 1996 | 0 | 0 |
| 1997 | 1 | 0 |
| 1998 | 1 | 0 |
| 1999 | 3 | 0 |
| 2000 | 3 | 0 |
| 2001 | 2 | 1 |
| 2002 | 0 | 1 |
| 2003 | 2 | 2 |
| 2004 | 3 | 4 |
| 2005 | 0 | 1 |
| 2006 | 3 | 1 |
| 2007 | 0 | 4 |
| 2008 | 0 | 2 |
| 2009 | 0 | 3 |
| 2010 | 3 | 2 |
| 2011 | 3 | 1 |
| 2012 | 1 | 1 |
| 2013 | 0 | 4 |
| 2014 | 1 | 0 |
| 2015 | 3 | 0 |
| 2016 | 0 | 1 |
| 2017 | 1 | 1 |
| 2018 | 1 | 0 |
| 2019 | 1 | 1 |
| 2020 | 2 | 3 |
| 2021 | 0 | 0 |
| 2022 | 1 | 3 |
| 2023 | 2 | 1 |
| 2024 | 2 | 5 |
| 2025 | 1 | 0 |
| 2026 | 1 | 1 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Systems and methods for fuel selection for combustion devices7 Jul 2026US 12,674,577 B2Rheem Manufacturing Company
- Water heater operation monitoring and notification21 Jan 2025US 12,203,684 B2Rheem Manufacturing Company
- Automatic burner control delay period setting for oil burner9 Apr 2024US 11,953,204 B2R. W. Beckett Corporation
- Combustion air proving apparatus with burner cut-off capability and method of performing the same23 Jan 2024US 11,879,640 B2Cowles Operating Company
- Water heater operation monitoring and notification13 Jun 2023US 11,674,717 B2Rheem Manufacturing Company
- Systems and Methods for Pre-Ignition Moisture Removal in Heating Alliances12 Feb 2026US 2026/0043543 A1Rheem Manufacturing Company
- Method for controlling heating apparatus19 Dec 2024US 2024/0418410 A1Hephzibah Co., Ltd.
- A method of starting a burner device and heating device having a burner device19 Sep 2024US 2024/0310045 A1Truma Geraetetechnik GmbH & Co. KG
- Combustion air proving apparatus with burner cut-off capability and method of performing the same4 Apr 2024US 2024/0110702 A1Cowles Operating Company
- Flame monitoring device and flame monitoring program1 Feb 2024US 2024/0035658 A1Azbil Corporation
Most cited
By later US patents
- Integrated appliance control system186US 6,059,195 ATridelta Industries, Inc. · 2000
- Ignition control system for a gas appliance131US 4,695,246 ALennox Industries Inc. · 1987
- Integrated furnace control69US 5,271,556 AAmerican Standard Inc. · 1993
- Flow control system49US 5,819,721 ATridelta Industries, Inc. · 1998
- Flow control system40US 5,601,071 ATridelta Industries, Inc. · 1997