F28D 9/04
The conduits being formed by spirally-wound plates or laminae
Official title: the conduits being formed by spirally-wound plates or laminae
F28D9/04 (The conduits being formed by spirally-wound plates or laminae) appears on 154 US grants and 135 published applications in this corpus.
Search patents in F28D- Granted patents
- 154
- Published applications
- 135
- Assignees
- 92
- Inventors
- 279
- Latest grant
- 8 Sep 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 1 | 0 |
| 1977 | 0 | 0 |
| 1978 | 3 | 0 |
| 1979 | 1 | 0 |
| 1980 | 2 | 0 |
| 1981 | 2 | 0 |
| 1982 | 0 | 0 |
| 1983 | 2 | 0 |
| 1984 | 2 | 0 |
| 1985 | 2 | 0 |
| 1986 | 2 | 0 |
| 1987 | 2 | 0 |
| 1988 | 0 | 0 |
| 1989 | 0 | 0 |
| 1990 | 1 | 0 |
| 1991 | 2 | 0 |
| 1992 | 1 | 0 |
| 1993 | 3 | 0 |
| 1994 | 2 | 0 |
| 1995 | 2 | 0 |
| 1996 | 3 | 0 |
| 1997 | 2 | 0 |
| 1998 | 3 | 0 |
| 1999 | 2 | 0 |
| 2000 | 5 | 0 |
| 2001 | 4 | 4 |
| 2002 | 0 | 3 |
| 2003 | 4 | 5 |
| 2004 | 5 | 7 |
| 2005 | 2 | 4 |
| 2006 | 8 | 4 |
| 2007 | 2 | 4 |
| 2008 | 2 | 3 |
| 2009 | 2 | 1 |
| 2010 | 2 | 6 |
| 2011 | 6 | 7 |
| 2012 | 2 | 6 |
| 2013 | 3 | 3 |
| 2014 | 4 | 2 |
| 2015 | 2 | 10 |
| 2016 | 5 | 3 |
| 2017 | 1 | 4 |
| 2018 | 5 | 4 |
| 2019 | 3 | 5 |
| 2020 | 8 | 14 |
| 2021 | 8 | 7 |
| 2022 | 7 | 8 |
| 2023 | 9 | 4 |
| 2024 | 8 | 11 |
| 2025 | 4 | 5 |
| 2026 | 3 | 1 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
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Most cited
By later US patents
- Counterflow catalytic device70US 5,326,537 A1994
- Microcombustor and combustion-based thermoelectric microgenerator69US 6,613,972 B2University of Southern California · 2003
- Method of dehumidification54US 4,391,616 AToyo Boseki Kabushiki Kaisha · 1983
- Spiral heat exchanger39US 4,993,487 ASundstrand Corporation · 1991
- Fuel cell battery with an integrated heat exchanger31US 7,041,406 B2Sulzer Hexis AG · 2006