F24B 5/021
Combustion-air circulation
Official title: {combustion-air circulation}
F24B5/021 (Combustion-air circulation) appears on 266 US grants and 183 published applications in this corpus.
Search patents in F24B- Granted patents
- 266
- Published applications
- 183
- Assignees
- 108
- Inventors
- 383
- Latest grant
- 25 Aug 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1977 | 1 | 0 |
| 1978 | 2 | 0 |
| 1979 | 4 | 0 |
| 1980 | 6 | 0 |
| 1981 | 11 | 0 |
| 1982 | 18 | 0 |
| 1983 | 17 | 0 |
| 1984 | 16 | 0 |
| 1985 | 7 | 0 |
| 1986 | 5 | 0 |
| 1987 | 7 | 0 |
| 1988 | 6 | 0 |
| 1989 | 4 | 0 |
| 1990 | 3 | 0 |
| 1991 | 4 | 0 |
| 1992 | 2 | 0 |
| 1993 | 1 | 0 |
| 1994 | 2 | 0 |
| 1995 | 4 | 0 |
| 1996 | 1 | 0 |
| 1997 | 2 | 0 |
| 1998 | 0 | 0 |
| 1999 | 0 | 0 |
| 2000 | 2 | 0 |
| 2001 | 2 | 2 |
| 2002 | 1 | 0 |
| 2003 | 3 | 2 |
| 2004 | 3 | 2 |
| 2005 | 1 | 4 |
| 2006 | 1 | 0 |
| 2007 | 0 | 0 |
| 2008 | 1 | 2 |
| 2009 | 0 | 3 |
| 2010 | 0 | 2 |
| 2011 | 2 | 3 |
| 2012 | 2 | 1 |
| 2013 | 1 | 6 |
| 2014 | 6 | 6 |
| 2015 | 2 | 6 |
| 2016 | 3 | 8 |
| 2017 | 4 | 5 |
| 2018 | 6 | 10 |
| 2019 | 7 | 6 |
| 2020 | 8 | 16 |
| 2021 | 21 | 14 |
| 2022 | 9 | 20 |
| 2023 | 13 | 9 |
| 2024 | 19 | 24 |
| 2025 | 16 | 22 |
| 2026 | 10 | 10 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Combustible fuel burning stove with pellet adapter25 Aug 2026US 12,716,581 B2Solo Brands, LLC
- Detachable secondary incinerator4 Aug 2026US 12,698,903 B2Zhejiang Pan An Cherry Hardware Co., Ltd
- Portable fire-starting device21 Jul 2026US 12,687,300 B1
- Furnace30 Jun 2026US 12,669,266 B2Fire Chief Industries LLC
- Retractable and foldable wood-burning stove16 Jun 2026US 12,655,982 B1
- Oven door8 Oct 2026US 2026/0309331 A1Ooni Limited
- Fire pit with detachable housing20 Aug 2026US 2026/0243433 A1Monument Grill LLC
- External Natural Passive Airflow Management and Amplification System for Optimization of Outdoor Combustion Systems, Firepits, Barbecues, and Campfires13 Aug 2026US 2026/0235291 A1
- Fireplace with a standardized technological base30 Jul 2026US 2026/0218911 A1Stuv S.A.
- Fully Combustion-supporting Stove9 Jul 2026US 2026/0194229 A1Wuyi Migo Leisure Products Co., Ltd.
Most cited
By later US patents
- Space heating system, heater, and combustion chamber72US 5,553,604 A1996
- Catalytic stove61US 4,319,556 AJamestown Group · 1982
- High-capacity sparkless mobile double-insulated wood pellet burner unit54US 10,222,092 B1Original Pellet Grill Company LLC · 2019
- Portable combustion device utilizing thermoelectrical generation41US 8,297,271 B2BioLite LLC · 2012
- Stove with catalytic converter39US 4,494,525 ACorning Glass Works · 1985