F23B
Methods or apparatus for combustion using only solid fuel
Official title: METHODS OR APPARATUS FOR COMBUSTION USING ONLY SOLID FUEL (for combustion of fuels that are solid at room temperatures, but burned in melted form, e.g. candle wax, C11C5/00, F23C, F23D; using solid fuel suspended in air F23C, F23D1/00; using solid fuel suspended in liquids F23C, F23D11/00; using solid fuel together with fluid fuel or with solid fuel suspended in air, simultaneously or alternately, F23C, F23D17/00)
F23B (Methods or apparatus for combustion using only solid fuel) appears on 734 US grants and 569 published applications in this corpus.
Search patents in F23B- Granted patents
- 734
- Published applications
- 569
- Assignees
- 422
- Inventors
- 1,356
- Latest grant
- 29 Sep 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 6 | 0 |
| 1977 | 15 | 0 |
| 1978 | 9 | 0 |
| 1979 | 5 | 0 |
| 1980 | 14 | 0 |
| 1981 | 23 | 0 |
| 1982 | 18 | 0 |
| 1983 | 24 | 0 |
| 1984 | 35 | 0 |
| 1985 | 29 | 0 |
| 1986 | 30 | 0 |
| 1987 | 19 | 0 |
| 1988 | 17 | 0 |
| 1989 | 14 | 0 |
| 1990 | 12 | 0 |
| 1991 | 16 | 0 |
| 1992 | 13 | 0 |
| 1993 | 7 | 0 |
| 1994 | 12 | 0 |
| 1995 | 3 | 0 |
| 1996 | 5 | 0 |
| 1997 | 6 | 0 |
| 1998 | 6 | 0 |
| 1999 | 9 | 0 |
| 2000 | 7 | 0 |
| 2001 | 4 | 1 |
| 2002 | 6 | 3 |
| 2003 | 4 | 3 |
| 2004 | 2 | 9 |
| 2005 | 0 | 6 |
| 2006 | 5 | 4 |
| 2007 | 3 | 18 |
| 2008 | 2 | 17 |
| 2009 | 3 | 24 |
| 2010 | 10 | 25 |
| 2011 | 8 | 20 |
| 2012 | 10 | 16 |
| 2013 | 12 | 34 |
| 2014 | 13 | 25 |
| 2015 | 19 | 30 |
| 2016 | 21 | 31 |
| 2017 | 22 | 28 |
| 2018 | 27 | 38 |
| 2019 | 26 | 29 |
| 2020 | 30 | 53 |
| 2021 | 32 | 30 |
| 2022 | 24 | 40 |
| 2023 | 22 | 30 |
| 2024 | 34 | 22 |
| 2025 | 26 | 22 |
| 2026 | 15 | 11 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Main groups
Granted patents with any code in the group
- F23B 1/00Combustion apparatus using only lump fuel233
- F23B 90/00Combustion methods not related to a particular type of apparatus128
- F23B 5/00Combustion apparatus with arrangements for burning uncombusted material from primary combustion125
- F23B 7/00Combustion techniques102
- F23B 60/00Combustion apparatus in which the fuel burns essentially without moving101
- F23B 50/00Combustion apparatus in which the fuel is fed into or through the87
- F23B 40/00Combustion apparatus with driven means for feeding fuel into the combustion chamber77
- F23B 80/00Combustion apparatus characterised by means creating a distinct flow path for flue64
All 18 main groupsShow fewer
- F23B 2900/00Special features of, or arrangements for combustion apparatus using solid fuelsIndexing code52
- F23B 30/00Combustion apparatus with driven means for agitating the burning fuel47
- F23B 10/00Combustion apparatus characterised by the combination of two or more combustion chambers46
- F23B 2700/00Combustion apparatus for solid fuelIndexing code38
- F23B 20/00Combustion apparatus specially adapted for portability or transportability24
- F23B 3/00Combustion apparatus which is portable or removable with respect to the boiler20
- F23B 99/00Subject matter not provided for in other groups of this subclass9
- F23B 70/00Combustion apparatus characterised by means for returning solid combustion residues to the5
- F23B 2101/00Adaptation of combustion apparatus to boilers in which the combustion chamber isIndexing code0
- F23B 2103/00Adaptation of combustion apparatus for placement in or against an opening ofIndexing code0
Recent patents
- Systems and methods for heating of dispersed metallic particles29 Sep 2026US 12,747,858 B2Oqab Dietrich Induction Inc.
- Precise energy-saving and temperature control system for pellet grills15 Sep 2026US 12,736,224 B1Dongguan Fortress Co., Ltd.
- Combustible fuel burning stove with pellet adapter25 Aug 2026US 12,716,581 B2Solo Brands, LLC
- Container for combustion of solid fuel11 Aug 2026US 12,704,251 B1Staggemeyer Wood Products, LLC
- Detachable secondary incinerator4 Aug 2026US 12,698,903 B2Zhejiang Pan An Cherry Hardware Co., Ltd
- Apparatus for feeding solid fuel feedstock into a furnace8 Oct 2026US 2026/0309324 A1British American Tobacco (Investments) Limited
- Flue gas circulation system for improving combustion characteristics and thermal characteristics of pulverized coal fired boiler3 Sep 2026US 2026/0258941 A1Xi'an Thermal Power Research Institute Co., Ltd.
- Feeding and Mixing Device20 Aug 2026US 2026/0241356 A1Orion Engineered Carbons IP GmbH & Co. KG
- Electronic closed-loop control device for fireplaces comprising a lower combustion system23 Jul 2026US 2026/0210553 A1Maxitrol Company
- Jamming resistant auger for cooker9 Jul 2026US 2026/0194225 A1GMG Products, LLC
Most cited
By later US patents
- Pellet-fired barbecue119US 4,823,684 A1989
- Combination of supercritical wet combustion and compressed air energy storage112US 4,593,202 ADipac Associates · 1986
- Pellet fuel burning device104US 6,223,737 B12001
- Self-contained heating unit and drug-supply unit employing same102US 8,387,612 B2Alexza Pharmaceuticals, Inc. · 2013
- Method for apparatus for combusting fuel in a combustion chamber97US 5,154,599 A1992