F23N 2221/08
Preheating the air
F23N2221/08 (Preheating the air) appears on 61 US grants and 43 published applications in this corpus.
Search patents in F23N- Granted patents
- 61
- Published applications
- 43
- Assignees
- 51
- Inventors
- 154
- Latest grant
- 25 Aug 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 2 | 0 |
| 1977 | 1 | 0 |
| 1978 | 0 | 0 |
| 1979 | 0 | 0 |
| 1980 | 1 | 0 |
| 1981 | 0 | 0 |
| 1982 | 0 | 0 |
| 1983 | 0 | 0 |
| 1984 | 3 | 0 |
| 1985 | 1 | 0 |
| 1986 | 1 | 0 |
| 1987 | 1 | 0 |
| 1988 | 0 | 0 |
| 1989 | 0 | 0 |
| 1990 | 2 | 0 |
| 1991 | 2 | 0 |
| 1992 | 1 | 0 |
| 1993 | 1 | 0 |
| 1994 | 0 | 0 |
| 1995 | 1 | 0 |
| 1996 | 2 | 0 |
| 1997 | 3 | 0 |
| 1998 | 0 | 0 |
| 1999 | 0 | 0 |
| 2000 | 2 | 0 |
| 2001 | 2 | 2 |
| 2002 | 0 | 1 |
| 2003 | 3 | 0 |
| 2004 | 6 | 3 |
| 2005 | 2 | 0 |
| 2006 | 2 | 0 |
| 2007 | 0 | 2 |
| 2008 | 1 | 2 |
| 2009 | 0 | 3 |
| 2010 | 2 | 2 |
| 2011 | 0 | 3 |
| 2012 | 0 | 2 |
| 2013 | 1 | 0 |
| 2014 | 1 | 1 |
| 2015 | 1 | 1 |
| 2016 | 3 | 1 |
| 2017 | 0 | 2 |
| 2018 | 0 | 2 |
| 2019 | 1 | 0 |
| 2020 | 1 | 2 |
| 2021 | 2 | 5 |
| 2022 | 2 | 3 |
| 2023 | 3 | 3 |
| 2024 | 0 | 1 |
| 2025 | 3 | 2 |
| 2026 | 1 | 0 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Systems and methods for operation of a flexible fuel combustor25 Aug 2026US 12,716,589 B28 Rivers Capital, LLC
- Temperature control system for an air preheater installation29 Apr 2025US 12,287,092 B2Arvos Ljungstrom LLC
- Systems and methods for operation of a flexible fuel combustor25 Mar 2025US 12,259,136 B28 Rivers Capital, LLC
- Water heater receiving humidified air4 Mar 2025US 12,241,654 B2Kyungdong Navien Co., Ltd.
- Systems and methods for operation of a flexible fuel combustor28 Nov 2023US 11,828,468 B28 Rivers Capital, LLC
- Systems and methods for operation of a flexible fuel combustor12 Jun 2025US 2025/0189135 A18 Rivers Capital, LLC
- Heater with remote combustion air addition23 Jan 2025US 2025/0027643 A1Lummus Technology Inc.
- A Temperature Control System for an Air Preheater Installation4 Jan 2024US 2024/0003542 A1Arvos Ljungstrom LLC
- Systems and methods for operation of a flexible fuel combustor30 Nov 2023US 2023/0383950 A18 Rivers Capital, LLC
- Water heater receiving humidified air4 May 2023US 2023/0139832 A1Kyungdong Navien Co., Ltd.
Most cited
By later US patents
- Dynamic control system and method for catalytic combustion process and gas turbine engine utilizing same90US 6,095,793 AWoodward Governor Company · 2000
- Frequency modulated burner system54US 4,583,936 AGas Research Institute · 1986
- Gas/air ratio control apparatus for a temperature control loop for gas appliances53US 5,630,408 ARanco Incorporated of Delaware · 1997
- Input/loss method for determining fuel flow, chemistry, heating value and performance of a fossil-fired system42US 6,522,994 B1Exergetic Systems LLC · 2003
- Method of controlling combustion28US 4,528,918 AHitachi, Ltd. · 1985