F28D 7/1669
The conduit assemblies having an annular shape
Official title: {the conduit assemblies having an annular shape; the conduits being assembled around a central distribution tube}
F28D7/1669 (The conduit assemblies having an annular shape) appears on 209 US grants and 217 published applications in this corpus.
Search patents in F28D- Granted patents
- 209
- Published applications
- 217
- Assignees
- 164
- Inventors
- 547
- Latest grant
- 22 Sep 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 1 | 0 |
| 1977 | 3 | 0 |
| 1978 | 3 | 0 |
| 1979 | 3 | 0 |
| 1980 | 1 | 0 |
| 1981 | 2 | 0 |
| 1982 | 5 | 0 |
| 1983 | 2 | 0 |
| 1984 | 1 | 0 |
| 1985 | 3 | 0 |
| 1986 | 2 | 0 |
| 1987 | 4 | 0 |
| 1988 | 1 | 0 |
| 1989 | 3 | 0 |
| 1990 | 2 | 0 |
| 1991 | 1 | 0 |
| 1992 | 0 | 0 |
| 1993 | 2 | 0 |
| 1994 | 3 | 0 |
| 1995 | 0 | 0 |
| 1996 | 1 | 0 |
| 1997 | 1 | 0 |
| 1998 | 1 | 0 |
| 1999 | 2 | 0 |
| 2000 | 0 | 0 |
| 2001 | 2 | 0 |
| 2002 | 1 | 1 |
| 2003 | 0 | 5 |
| 2004 | 5 | 9 |
| 2005 | 2 | 4 |
| 2006 | 2 | 4 |
| 2007 | 4 | 6 |
| 2008 | 2 | 12 |
| 2009 | 0 | 4 |
| 2010 | 11 | 8 |
| 2011 | 2 | 6 |
| 2012 | 4 | 12 |
| 2013 | 3 | 7 |
| 2014 | 10 | 13 |
| 2015 | 5 | 9 |
| 2016 | 6 | 11 |
| 2017 | 16 | 9 |
| 2018 | 5 | 7 |
| 2019 | 12 | 17 |
| 2020 | 6 | 15 |
| 2021 | 17 | 17 |
| 2022 | 12 | 11 |
| 2023 | 14 | 12 |
| 2024 | 9 | 8 |
| 2025 | 8 | 8 |
| 2026 | 4 | 2 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
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- Rotary Batch Preheater26 Mar 2026US 2026/0084995 A1
- Heat exchanger with expansion joint for thermal expansion and external force tolerance30 Oct 2025US 2025/0334356 A1Rolls-Royce North American Technologies Inc.
- Capillary condensing heat exchanger28 Aug 2025US 2025/0269298 A1Irpi LLC
- Turbomachine for an Aircraft Engine7 Aug 2025US 2025/0250930 A1MTU Aero Engines AG
Most cited
By later US patents
- Method and apparatus for in situ gasification of coal and the commercial products derived therefrom276US 3,952,802 AIn Situ Technology, Inc. · 1976
- Tubular heat exchange systems97US 9,200,855 B2Honeywell International Inc. · 2015
- Turbofan provided with a pre-cooler46US 7,926,261 B2Airbus France · 2011
- Modular heat exchanger42US 4,098,329 AThe United States of America as represented by the United States Department of Energy · 1978
- Internally finned tube41US 4,163,474 AE. I. Du Pont de Nemours and Company · 1979