F23N 2235/04
In stacks
Official title: in stacks
F23N2235/04 (In stacks) appears on 120 US grants and 30 published applications in this corpus.
Search patents in F23N- Granted patents
- 120
- Published applications
- 30
- Assignees
- 63
- Inventors
- 161
- Latest grant
- 21 Oct 2025
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 3 | 0 |
| 1977 | 4 | 0 |
| 1978 | 7 | 0 |
| 1979 | 2 | 0 |
| 1980 | 12 | 0 |
| 1981 | 17 | 0 |
| 1982 | 3 | 0 |
| 1983 | 10 | 0 |
| 1984 | 8 | 0 |
| 1985 | 3 | 0 |
| 1986 | 3 | 0 |
| 1987 | 3 | 0 |
| 1988 | 1 | 0 |
| 1989 | 2 | 0 |
| 1990 | 1 | 0 |
| 1991 | 2 | 0 |
| 1992 | 2 | 0 |
| 1993 | 2 | 0 |
| 1994 | 2 | 0 |
| 1995 | 4 | 0 |
| 1996 | 4 | 0 |
| 1997 | 1 | 0 |
| 1998 | 0 | 0 |
| 1999 | 1 | 0 |
| 2000 | 1 | 0 |
| 2001 | 2 | 0 |
| 2002 | 2 | 1 |
| 2003 | 0 | 1 |
| 2004 | 1 | 1 |
| 2005 | 0 | 4 |
| 2006 | 0 | 0 |
| 2007 | 1 | 1 |
| 2008 | 1 | 0 |
| 2009 | 0 | 4 |
| 2010 | 0 | 0 |
| 2011 | 0 | 1 |
| 2012 | 2 | 4 |
| 2013 | 0 | 2 |
| 2014 | 2 | 1 |
| 2015 | 2 | 0 |
| 2016 | 0 | 2 |
| 2017 | 1 | 0 |
| 2018 | 1 | 0 |
| 2019 | 1 | 1 |
| 2020 | 0 | 1 |
| 2021 | 0 | 1 |
| 2022 | 2 | 4 |
| 2023 | 1 | 0 |
| 2024 | 1 | 0 |
| 2025 | 2 | 1 |
By publication year. Applications have been published since 2001.
Recent patents
- Heat exchange flue and heat exchange device21 Oct 2025US 12,449,125 B2
- Collective exhaust system15 Apr 2025US 12,276,421 B2Noritz Corporation
- Combustion apparatus2 Apr 2024US 11,946,643 B2Noritz Corporation
- Systems and methods of configuring a heating system26 Dec 2023US 11,852,340 B2Rheem Manufacturing Company
- Adjustable restrictor for burner20 Dec 2022US 11,530,814 B2Beckett Gas, Inc.
- Combustion system able to operate with recycling of the combustion gas27 Nov 2025US 2025/0362016 A1Carbodown
- Collective exhaust system29 Dec 2022US 2022/0412558 A1Noritz Corporation
- Systems and methods of configuring a heating system6 Oct 2022US 2022/0316704 A1Rheem Manufacturing Company
- Automatic air-flow settings in combustion systems and associated methods14 Jul 2022US 2022/0221149 A1OnPoint Technologies, LLC
- Heat Exchange Flue and Heat Exchange Device9 Jun 2022US 2022/0178536 A1
Most cited
By later US patents
- Furnace monitoring system97US 4,296,727 AMicro-Burner Systems Corporation · 1981
- Self-powered intermittent ignition and control system for gas combustion appliances65US 4,778,378 AThe Quantum Group, Inc. · 1988
- Safety control for furnace burner57US 4,204,833 AScotty Vent Dampers · 1980
- Gas log fireplace system57US 5,575,274 A1996
- Self-contained electric igniter with rechargeable battery54US 4,131,413 AA. O. Smith Corporation · 1978