F23L 17/04
Balanced-flue arrangements, i.e. devices which combine air inlet to combustion unit with
Official title: Balanced-flue arrangements, i.e. devices which combine air inlet to combustion unit with smoke outlet
F23L17/04 (Balanced-flue arrangements, i.e. devices which combine air inlet to combustion unit with) appears on 56 US grants and 30 published applications in this corpus.
Search patents in F23L- Granted patents
- 56
- Published applications
- 30
- Assignees
- 50
- Inventors
- 100
- Latest grant
- 6 May 2025
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 1 | 0 |
| 1977 | 0 | 0 |
| 1978 | 1 | 0 |
| 1979 | 0 | 0 |
| 1980 | 0 | 0 |
| 1981 | 2 | 0 |
| 1982 | 0 | 0 |
| 1983 | 0 | 0 |
| 1984 | 0 | 0 |
| 1985 | 0 | 0 |
| 1986 | 0 | 0 |
| 1987 | 3 | 0 |
| 1988 | 2 | 0 |
| 1989 | 0 | 0 |
| 1990 | 3 | 0 |
| 1991 | 3 | 0 |
| 1992 | 0 | 0 |
| 1993 | 1 | 0 |
| 1994 | 1 | 0 |
| 1995 | 0 | 0 |
| 1996 | 3 | 0 |
| 1997 | 1 | 0 |
| 1998 | 2 | 0 |
| 1999 | 3 | 0 |
| 2000 | 5 | 0 |
| 2001 | 1 | 0 |
| 2002 | 1 | 4 |
| 2003 | 3 | 0 |
| 2004 | 1 | 0 |
| 2005 | 0 | 0 |
| 2006 | 0 | 1 |
| 2007 | 0 | 3 |
| 2008 | 0 | 0 |
| 2009 | 0 | 0 |
| 2010 | 1 | 3 |
| 2011 | 0 | 2 |
| 2012 | 3 | 1 |
| 2013 | 2 | 0 |
| 2014 | 2 | 2 |
| 2015 | 2 | 1 |
| 2016 | 2 | 2 |
| 2017 | 1 | 4 |
| 2018 | 2 | 0 |
| 2019 | 2 | 0 |
| 2020 | 0 | 1 |
| 2021 | 0 | 1 |
| 2022 | 0 | 2 |
| 2023 | 0 | 0 |
| 2024 | 1 | 0 |
| 2025 | 1 | 2 |
| 2026 | 0 | 1 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Intake device for a chimney termination6 May 2025US 12,292,192 B2Rlh Industries, Inc.
- Low profile termination cap for direct vent appliance2 Jan 2024US 11,859,826 B2Wolf Steel Ltd.
- Exhaust adapter, exhaust structure for water heater, and method for installing exhaust adapter17 Sep 2019US 10,415,827 B2Noritz Corporation
- Throttled direct vent termination25 Jun 2019US 10,330,314 B2DuraVent, Inc.
- Exhaust adapter, exhaust structure for water heater, and method for installing exhaust adapter5 Jun 2018US 9,989,252 B2Noritz Corporation
- Exhaust port member23 Apr 2026US 2026/0110431 A1Rinnai Corporation
- Intake device for a chimney termination20 Nov 2025US 2025/0354688 A1Rlh Industries, Inc.
- Vent Attachment for Tankless Water Heater22 May 2025US 2025/0164113 A1Rheem Manufacturing Company
- Intake device for a chimney termination25 Aug 2022US 2022/0268441 A1Rlh Industries, Inc.
- Vent termination for household exhaust, combustion gases and air intake11 Aug 2022US 2022/0252263 A1Hybrid Energies Alternative Technologies Inc.
Most cited
By later US patents
- Direct-vented gas fireplace70US 4,793,322 A1988
- Water heater construction and method of heating water53US 5,020,512 AState Industries, Inc. · 1991
- System and apparatus for venting water heater44US 4,940,042 AMor-Flo Industries, Inc. · 1990
- Method and apparatus for powered flue products exhaust and preheated combustion air supply37US 4,262,608 A1981
- Direct vent fireplace26US 5,715,808 ATemco Fireplace Products, Inc. · 1998