F23J 2211/00
Flue gas duct systems
F23J2211/00 (Flue gas duct systems) appears on 73 US grants and 55 published applications in this corpus.
Search patents in F23J- Granted patents
- 73
- Published applications
- 55
- Assignees
- 57
- Inventors
- 158
- Latest grant
- 21 Oct 2025
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1979 | 1 | 0 |
| 1980 | 0 | 0 |
| 1981 | 2 | 0 |
| 1982 | 0 | 0 |
| 1983 | 1 | 0 |
| 1984 | 1 | 0 |
| 1985 | 0 | 0 |
| 1986 | 0 | 0 |
| 1987 | 6 | 0 |
| 1988 | 1 | 0 |
| 1989 | 1 | 0 |
| 1990 | 2 | 0 |
| 1991 | 2 | 0 |
| 1992 | 0 | 0 |
| 1993 | 1 | 0 |
| 1994 | 3 | 0 |
| 1995 | 1 | 0 |
| 1996 | 0 | 0 |
| 1997 | 1 | 0 |
| 1998 | 3 | 0 |
| 1999 | 2 | 0 |
| 2000 | 6 | 0 |
| 2001 | 1 | 2 |
| 2002 | 1 | 1 |
| 2003 | 4 | 2 |
| 2004 | 1 | 1 |
| 2005 | 2 | 1 |
| 2006 | 0 | 2 |
| 2007 | 0 | 1 |
| 2008 | 1 | 1 |
| 2009 | 0 | 1 |
| 2010 | 0 | 3 |
| 2011 | 0 | 0 |
| 2012 | 3 | 3 |
| 2013 | 2 | 3 |
| 2014 | 0 | 2 |
| 2015 | 0 | 1 |
| 2016 | 3 | 0 |
| 2017 | 0 | 6 |
| 2018 | 4 | 4 |
| 2019 | 4 | 5 |
| 2020 | 2 | 2 |
| 2021 | 1 | 2 |
| 2022 | 2 | 5 |
| 2023 | 2 | 3 |
| 2024 | 3 | 2 |
| 2025 | 3 | 2 |
By publication year. Applications have been published since 2001.
Subgroups
Granted patents
Recent patents
- Heat exchange flue and heat exchange device21 Oct 2025US 12,449,125 B2
- Processes and apparatuses for burning a hydrogen fuel and a hydrocarbon fuel26 Aug 2025US 12,398,879 B2Uop LLC
- Roof plumbing vents and methods including for tankless water heaters with concentric venting28 Jan 2025US 12,209,749 B2Aurora Plumbing Company, LLC
- Roof plumbing vents and methods including for tankless water heaters with concentric venting3 Sep 2024US 12,078,347 B2Aurora Plumbing Company, LLC
- Arrangement having two burners5 Mar 2024US 11,920,785 B2Truma Gerätetechnik GmbH & Co. KG
- Chimney systems with integrated waste heat recovery and related methods9 Oct 2025US 2025/0314380 A1Enervex, Inc.
- Vent Attachment for Tankless Water Heater22 May 2025US 2025/0164113 A1Rheem Manufacturing Company
- Roof plumbing vents and methods including for tankless water heaters with concentric venting31 Oct 2024US 2024/0360997 A1Aurora Plumbing Company, LLC
- Systems and methods for dehumidification, air conditioning, and controlled provision of co24 Jul 2024US 2024/0219059 A1
- Processes and apparatuses for burning a hydrogen fuel and a hydrocarbon fuel14 Sep 2023US 2023/0288057 A1Uop LLC
Most cited
By later US patents
- Water heater construction and method of heating water53US 5,020,512 AState Industries, Inc. · 1991
- Method and apparatus for powered flue products exhaust and preheated combustion air supply37US 4,262,608 A1981
- Direct power vented water heater32US 4,672,919 ABradford White Corporation · 1987
- Direct power vented water heater29US 4,867,106 ABradford White Corporation · 1989
- Direct vent gas appliance with vertical and horizontal venting27US 5,320,086 AMajco Building Specialties, L.P. · 1994