F23L 9/04
Passages or apertures for delivering secondary air for completing combustion of fuel
Official title: by discharging the air beyond the fire, i.e. nearer the smoke outlet
F23L9/04 (Passages or apertures for delivering secondary air for completing combustion of fuel) appears on 71 US grants and 70 published applications in this corpus.
Search patents in F23L- Granted patents
- 71
- Published applications
- 70
- Assignees
- 50
- Inventors
- 203
- Latest grant
- 9 Jun 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1981 | 1 | 0 |
| 1982 | 1 | 0 |
| 1983 | 2 | 0 |
| 1984 | 2 | 0 |
| 1985 | 0 | 0 |
| 1986 | 1 | 0 |
| 1987 | 0 | 0 |
| 1988 | 1 | 0 |
| 1989 | 1 | 0 |
| 1990 | 1 | 0 |
| 1991 | 0 | 0 |
| 1992 | 1 | 0 |
| 1993 | 0 | 0 |
| 1994 | 2 | 0 |
| 1995 | 0 | 0 |
| 1996 | 1 | 0 |
| 1997 | 0 | 0 |
| 1998 | 0 | 0 |
| 1999 | 0 | 0 |
| 2000 | 6 | 0 |
| 2001 | 3 | 1 |
| 2002 | 2 | 4 |
| 2003 | 1 | 4 |
| 2004 | 3 | 3 |
| 2005 | 4 | 4 |
| 2006 | 2 | 3 |
| 2007 | 0 | 1 |
| 2008 | 2 | 7 |
| 2009 | 3 | 2 |
| 2010 | 2 | 3 |
| 2011 | 3 | 5 |
| 2012 | 1 | 6 |
| 2013 | 4 | 1 |
| 2014 | 2 | 3 |
| 2015 | 3 | 5 |
| 2016 | 1 | 8 |
| 2017 | 3 | 1 |
| 2018 | 2 | 1 |
| 2019 | 3 | 2 |
| 2020 | 1 | 0 |
| 2021 | 1 | 2 |
| 2022 | 0 | 2 |
| 2023 | 0 | 1 |
| 2024 | 3 | 0 |
| 2025 | 1 | 1 |
| 2026 | 1 | 0 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Nozzle configured to deliver gas into incinerator9 Jun 2026US 12,650,225 B2Martin GmbH fur Umwelt- und Energietechnik
- Apparatus and method capable of monitoring and adjusting in-furnace combustion conditions in real time24 Jun 2025US 12,338,997 B2L Air Liquide, Societe Anonyme Pour L'Etude et L'Exploitation des Procedes Georges Claude
- Cabinet circulator solid fuel heater combustion system19 Nov 2024US 12,146,663 B2United States Stove Company
- Method for reducing nitrogen oxides in strip heat treatment furnaces23 Jul 2024US 12,044,402 B2Andritz Technology and Asset Management GmbH
- Direct smelting process with full combustion25 Jun 2024US 12,018,340 B2Tata Steel Nederland Technology B.V.
- Heater with remote combustion air addition23 Jan 2025US 2025/0027643 A1Lummus Technology Inc.
- Apparatus and method capable of monitoring and adjusting in-furnace combustion conditions in real time2 Mar 2023US 2023/0064445 A1L'Air Liquide, Societe Anonyme pour I'Etude et l'Exploitation des Procedes Georges Claude
- Nozzle Configured To Deliver Gas Into Incinerator17 Nov 2022US 2022/0364725 A1Martin GmbH fur Umwelt- und Energietechnik
- Cabinet circulator solid fuel heater combustion system25 Aug 2022US 2022/0268445 A1United States Stove Company
- Direct smelting process with full combustion29 Apr 2021US 2021/0123111 A1Tata Steel Nederland Technology B.V.
Most cited
By later US patents
- Integration of direct combustion with gasification for reduction of NOx emissions47US 6,694,900 B2General Electric Company · 2004
- Low nitrogen oxides emissions from carbonaceous fuel combustion using three stages of oxidation27US 6,085,674 AClearstack Combustion Corporation · 2000
- Pellet burning heating assembly27US 7,530,351 B22009
- Pressurized internal circulating fluidized-bed boiler25US 5,513,599 AEbara Corporation · 1996
- Low emission U-fired boiler combustion system24US 6,058,855 AD. B. Riley, Inc. · 2000