F24H 1/28
Including one or more furnace or fire tubes
Official title: including one or more furnace or fire tubes
F24H1/28 (Including one or more furnace or fire tubes) appears on 194 US grants and 121 published applications in this corpus.
Search patents in F24H- Granted patents
- 194
- Published applications
- 121
- Assignees
- 98
- Inventors
- 306
- Latest grant
- 21 Oct 2025
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1977 | 3 | 0 |
| 1978 | 0 | 0 |
| 1979 | 3 | 0 |
| 1980 | 2 | 0 |
| 1981 | 5 | 0 |
| 1982 | 5 | 0 |
| 1983 | 9 | 0 |
| 1984 | 13 | 0 |
| 1985 | 2 | 0 |
| 1986 | 3 | 0 |
| 1987 | 10 | 0 |
| 1988 | 6 | 0 |
| 1989 | 8 | 0 |
| 1990 | 8 | 0 |
| 1991 | 1 | 0 |
| 1992 | 3 | 0 |
| 1993 | 2 | 0 |
| 1994 | 4 | 0 |
| 1995 | 5 | 0 |
| 1996 | 4 | 0 |
| 1997 | 1 | 0 |
| 1998 | 2 | 0 |
| 1999 | 4 | 0 |
| 2000 | 5 | 0 |
| 2001 | 0 | 0 |
| 2002 | 1 | 1 |
| 2003 | 3 | 3 |
| 2004 | 1 | 1 |
| 2005 | 0 | 2 |
| 2006 | 1 | 0 |
| 2007 | 1 | 2 |
| 2008 | 1 | 2 |
| 2009 | 1 | 6 |
| 2010 | 1 | 7 |
| 2011 | 1 | 4 |
| 2012 | 4 | 9 |
| 2013 | 4 | 9 |
| 2014 | 11 | 8 |
| 2015 | 2 | 4 |
| 2016 | 4 | 5 |
| 2017 | 6 | 8 |
| 2018 | 4 | 7 |
| 2019 | 8 | 10 |
| 2020 | 4 | 10 |
| 2021 | 8 | 10 |
| 2022 | 7 | 8 |
| 2023 | 4 | 2 |
| 2024 | 6 | 1 |
| 2025 | 3 | 1 |
| 2026 | 0 | 1 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Method of manufacturing heat exchanger pipe21 Oct 2025US 12,449,160 B2
- Compact fluid heating system with high bulk heat flux using elevated heat exchanger pressure drop1 Jul 2025US 12,345,445 B2Fulton Group N.A., Inc.
- Wavy smoke tube structure of boiler22 Apr 2025US 12,281,818 B2
- Heat exchanger pipe, method of manufacturing heat exchanger pipe, heat exchanger fin, elliptical heat exchanger pipe, and hot water storage type heat exchanger having elliptical heat exchanger pipe10 Dec 2024US 12,163,695 B2
- Profile for a header of a cooler, a header having such a profile and a cooler having a header10 Sep 2024US 12,085,343 B2Hanon Systems
- Sieve element of a tubular heat exchanger and its use in a tubular heat exchanger22 Jan 2026US 2026/0022901 A1Aic Spolka Akcyjna
- Water heater15 May 2025US 2025/0155162 A1Kyungdong Navien Co., Ltd.
- Compact fluid heating system with high bulk heat flux using elevated heat exchanger pressure drop25 Apr 2024US 2024/0133586 A1Fulton Group N.A., Inc.
- Combustion boiler28 Sep 2023US 2023/0304658 A1
- Method of manufacturing heat exchanger pipe18 May 2023US 2023/0152005 A1
Most cited
By later US patents
- Pulsing combustion116US 4,569,310 AArkansas Patents, Inc. · 1986
- Low NO.sub.x multistage combustor110US 6,089,855 AThermo Power Corporation · 2000
- Pulsing combustion90US 4,479,484 AArkansas Patents, Inc. · 1984
- Pulsing combustion90US 4,651,712 AArkansas Patents, Inc. · 1987
- Pulsing combustion85US 4,488,865 AArkansas Patents, Inc. · 1984