F23L 9/02
Passages or apertures for delivering secondary air for completing combustion of fuel
Official title: by discharging the air above the fire
F23L9/02 (Passages or apertures for delivering secondary air for completing combustion of fuel) appears on 136 US grants and 127 published applications in this corpus.
Search patents in F23L- Granted patents
- 136
- Published applications
- 127
- Assignees
- 111
- Inventors
- 342
- Latest grant
- 25 Aug 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1977 | 1 | 0 |
| 1978 | 1 | 0 |
| 1979 | 1 | 0 |
| 1980 | 1 | 0 |
| 1981 | 1 | 0 |
| 1982 | 2 | 0 |
| 1983 | 1 | 0 |
| 1984 | 3 | 0 |
| 1985 | 4 | 0 |
| 1986 | 1 | 0 |
| 1987 | 2 | 0 |
| 1988 | 2 | 0 |
| 1989 | 2 | 0 |
| 1990 | 5 | 0 |
| 1991 | 2 | 0 |
| 1992 | 6 | 0 |
| 1993 | 6 | 0 |
| 1994 | 2 | 0 |
| 1995 | 2 | 0 |
| 1996 | 0 | 0 |
| 1997 | 1 | 0 |
| 1998 | 5 | 0 |
| 1999 | 4 | 0 |
| 2000 | 5 | 0 |
| 2001 | 3 | 0 |
| 2002 | 0 | 1 |
| 2003 | 0 | 3 |
| 2004 | 2 | 6 |
| 2005 | 2 | 2 |
| 2006 | 1 | 2 |
| 2007 | 2 | 6 |
| 2008 | 2 | 7 |
| 2009 | 1 | 6 |
| 2010 | 2 | 7 |
| 2011 | 3 | 4 |
| 2012 | 6 | 3 |
| 2013 | 6 | 3 |
| 2014 | 0 | 9 |
| 2015 | 2 | 3 |
| 2016 | 1 | 4 |
| 2017 | 3 | 2 |
| 2018 | 3 | 6 |
| 2019 | 3 | 7 |
| 2020 | 7 | 4 |
| 2021 | 5 | 5 |
| 2022 | 0 | 10 |
| 2023 | 4 | 10 |
| 2024 | 7 | 6 |
| 2025 | 6 | 9 |
| 2026 | 5 | 2 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
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Most cited
By later US patents
- Apparatus and method for reducing particulate emissions from combustion processes63US 5,702,244 AThermal Energy Systems, Incorporated · 1997
- Combustion optimization62US 6,712,606 B2Ecomb AB · 2004
- Method of introducing dry sulfur oxide absorbent material into a furnace46US 4,655,148 ACombustion Engineering, Inc. · 1987
- Fireplace stove39US 4,141,336 A1979
- Advanced overfire air system for NO.sub.x control27US 5,195,450 ACombustion Engineering, Inc. · 1993