F24H 3/08
By tubes
Official title: by tubes
F24H3/08 (By tubes) appears on 334 US grants and 301 published applications in this corpus.
Search patents in F24H- Granted patents
- 334
- Published applications
- 301
- Assignees
- 166
- Inventors
- 619
- Latest grant
- 14 Jul 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 2 | 0 |
| 1977 | 7 | 0 |
| 1978 | 5 | 0 |
| 1979 | 4 | 0 |
| 1980 | 11 | 0 |
| 1981 | 4 | 0 |
| 1982 | 8 | 0 |
| 1983 | 3 | 0 |
| 1984 | 6 | 0 |
| 1985 | 8 | 0 |
| 1986 | 6 | 0 |
| 1987 | 2 | 0 |
| 1988 | 2 | 0 |
| 1989 | 4 | 0 |
| 1990 | 6 | 0 |
| 1991 | 8 | 0 |
| 1992 | 3 | 0 |
| 1993 | 6 | 0 |
| 1994 | 7 | 0 |
| 1995 | 6 | 0 |
| 1996 | 1 | 0 |
| 1997 | 3 | 0 |
| 1998 | 3 | 0 |
| 1999 | 4 | 0 |
| 2000 | 4 | 0 |
| 2001 | 4 | 0 |
| 2002 | 1 | 1 |
| 2003 | 1 | 3 |
| 2004 | 2 | 2 |
| 2005 | 4 | 5 |
| 2006 | 4 | 5 |
| 2007 | 0 | 5 |
| 2008 | 1 | 11 |
| 2009 | 1 | 6 |
| 2010 | 7 | 8 |
| 2011 | 6 | 21 |
| 2012 | 4 | 22 |
| 2013 | 12 | 19 |
| 2014 | 9 | 15 |
| 2015 | 13 | 20 |
| 2016 | 11 | 28 |
| 2017 | 12 | 13 |
| 2018 | 25 | 20 |
| 2019 | 23 | 21 |
| 2020 | 13 | 14 |
| 2021 | 15 | 16 |
| 2022 | 10 | 10 |
| 2023 | 9 | 11 |
| 2024 | 8 | 13 |
| 2025 | 12 | 8 |
| 2026 | 4 | 4 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Furnace with improved efficiency controls14 Jul 2026US 12,680,729 B1Trane International Inc.
- Furnace30 Jun 2026US 12,669,266 B2Fire Chief Industries LLC
- Gas furnace and air conditioner having the same5 May 2026US 12,618,559 B2LG Electronics Inc.
- Heat exchanger17 Mar 2026US 12,578,121 B2Rinnai Corporation
- Method for the predictive maintenance of primary circuit components of a boiler2 Dec 2025US 12,486,988 B2
- Furnace with improved efficiency controls8 Oct 2026US 2026/0309369 A1Trane International Inc.
- Forced Air Furnace with a Novel Multi-Path Heat Exchanger Section6 Aug 2026US 2026/0227096 A1
- Waste-heat recirculating system, method of installation and method of use thereof30 Apr 2026US 2026/0117989 A1Highland Heat Harvesters Ltd
- Mobile air heater29 Jan 2026US 2026/0029161 A1Dometic Sweden AB
- Hvac burner assembly and a method thereof16 Oct 2025US 2025/0320997 A1Carrier Corporation
Most cited
By later US patents
- Heating heat exchanger with electric heat emitter90US 5,995,711 ADenso Corporation · 1999
- Warm air furnace with premix burner78US 6,880,548 B2Honeywell International Inc. · 2005
- Integrated furnace control69US 5,271,556 AAmerican Standard Inc. · 1993
- Core unit of heat exchanger having electric heater67US 6,178,292 B1Denso Corporation · 2001
- Electrically-powered portable space heater55US 4,518,847 ACrockett & Kelly, Inc. · 1985