F23D 11/404
Flame tubes
Official title: {Flame tubes (not forming part of the burner F23M9/06)}
F23D11/404 (Flame tubes) appears on 38 US grants and 39 published applications in this corpus.
Search patents in F23D- Granted patents
- 38
- Published applications
- 39
- Assignees
- 33
- Inventors
- 87
- Latest grant
- 18 Nov 2025
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1979 | 1 | 0 |
| 1980 | 2 | 0 |
| 1981 | 2 | 0 |
| 1982 | 1 | 0 |
| 1983 | 0 | 0 |
| 1984 | 0 | 0 |
| 1985 | 0 | 0 |
| 1986 | 0 | 0 |
| 1987 | 1 | 0 |
| 1988 | 0 | 0 |
| 1989 | 0 | 0 |
| 1990 | 0 | 0 |
| 1991 | 0 | 0 |
| 1992 | 1 | 0 |
| 1993 | 0 | 0 |
| 1994 | 0 | 0 |
| 1995 | 1 | 0 |
| 1996 | 1 | 0 |
| 1997 | 0 | 0 |
| 1998 | 0 | 0 |
| 1999 | 1 | 0 |
| 2000 | 1 | 0 |
| 2001 | 0 | 1 |
| 2002 | 0 | 0 |
| 2003 | 0 | 1 |
| 2004 | 3 | 3 |
| 2005 | 1 | 0 |
| 2006 | 0 | 2 |
| 2007 | 0 | 3 |
| 2008 | 0 | 2 |
| 2009 | 0 | 3 |
| 2010 | 1 | 1 |
| 2011 | 0 | 1 |
| 2012 | 0 | 0 |
| 2013 | 2 | 1 |
| 2014 | 1 | 1 |
| 2015 | 1 | 4 |
| 2016 | 3 | 3 |
| 2017 | 2 | 1 |
| 2018 | 1 | 0 |
| 2019 | 1 | 6 |
| 2020 | 2 | 2 |
| 2021 | 4 | 1 |
| 2022 | 2 | 1 |
| 2023 | 1 | 1 |
| 2024 | 0 | 1 |
| 2025 | 1 | 0 |
By publication year. Applications have been published since 2001.
Recent patents
- Device for heating a medium18 Nov 2025US 12,474,046 B2Truma Geraetetechnik GmbH & Co. KG
- Plugging resistant free-jet burner and method14 Feb 2023US 11,578,865 B2
- Exhaust-gas tract for a motor vehicle13 Dec 2022US 11,525,379 B2Dr. Ing. h. c. F. Porsche AG
- Vehicle heater26 Apr 2022US 11,312,209 B2Eberspächer Climate Control Systems GmbH & Co. KG
- Burner and vehicle heater6 Jul 2021US 11,052,729 B2Webasto SE
- Method for burning a liquid or gaseous fuel in a boiler, boiler for carrying out the method and thermal bath having a boiler29 Aug 2024US 2024/0288160 A1Swiss E-Futurtec AG
- Device for heating a medium28 Sep 2023US 2023/0304659 A1Truma Geraetetechnik GmbH & Co. KG
- Exhaust-gas tract for a motor vehicle14 Apr 2022US 2022/0112826 A1Dr. Ing. h,c.F. Porsche Aktiengesellschaft
- Plugging resistant free-jet burner and method18 Nov 2021US 2021/0356119 A1Zeeco, Inc.
- Trapped vortex combustor5 Mar 2020US 2020/0072467 A1Clearsign Combustion Corporation
Most cited
By later US patents
- Infrared burner23US 5,527,180 AInternational Thermal Investments Ltd. · 1996
- Flame modifier to reduce NO.sub.x emissions22US 4,284,402 AAtlantic Richfield Company · 1981
- Multifuel burner with pressurized fuel-holding tank19US 5,927,961 AInternational Thermal Investments Ltd. · 1999
- Waste oil burner18US 4,149,842 A1979
- Multi-fuel burner and heat exchanger13US 6,085,738 AInternational Thermal Investments Ltd. · 2000