F28F 1/426
The outside portions and the inside portions forming parts of complementary shape
Official title: {the outside portions and the inside portions forming parts of complementary shape, e.g. concave and convex}
F28F1/426 (The outside portions and the inside portions forming parts of complementary shape) appears on 111 US grants and 157 published applications in this corpus.
Search patents in F28F- Granted patents
- 111
- Published applications
- 157
- Assignees
- 109
- Inventors
- 395
- Latest grant
- 25 Aug 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1977 | 1 | 0 |
| 1978 | 1 | 0 |
| 1979 | 0 | 0 |
| 1980 | 1 | 0 |
| 1981 | 2 | 0 |
| 1982 | 1 | 0 |
| 1983 | 0 | 0 |
| 1984 | 0 | 0 |
| 1985 | 0 | 0 |
| 1986 | 0 | 0 |
| 1987 | 2 | 0 |
| 1988 | 1 | 0 |
| 1989 | 1 | 0 |
| 1990 | 0 | 0 |
| 1991 | 0 | 0 |
| 1992 | 1 | 0 |
| 1993 | 1 | 0 |
| 1994 | 1 | 0 |
| 1995 | 0 | 0 |
| 1996 | 2 | 0 |
| 1997 | 2 | 0 |
| 1998 | 4 | 0 |
| 1999 | 2 | 0 |
| 2000 | 0 | 0 |
| 2001 | 0 | 0 |
| 2002 | 1 | 3 |
| 2003 | 0 | 3 |
| 2004 | 2 | 2 |
| 2005 | 2 | 5 |
| 2006 | 3 | 6 |
| 2007 | 4 | 8 |
| 2008 | 0 | 3 |
| 2009 | 0 | 8 |
| 2010 | 0 | 8 |
| 2011 | 3 | 9 |
| 2012 | 4 | 6 |
| 2013 | 2 | 5 |
| 2014 | 4 | 14 |
| 2015 | 6 | 11 |
| 2016 | 3 | 2 |
| 2017 | 7 | 9 |
| 2018 | 3 | 7 |
| 2019 | 8 | 7 |
| 2020 | 6 | 10 |
| 2021 | 10 | 12 |
| 2022 | 6 | 5 |
| 2023 | 3 | 5 |
| 2024 | 5 | 4 |
| 2025 | 2 | 3 |
| 2026 | 4 | 2 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
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Most cited
By later US patents
- Dimpled heat exchange tube51US 5,839,505 AAAON, Inc. · 1998
- Enhanced tubular heat exchanger45US 5,094,224 AInter-City Products Corporation (USA) · 1992
- Heat transfer tube for single phase flow38US 4,690,211 AHitachi Cable, Ltd. · 1987
- Carbon dioxide refrigerant-coolant heat exchanger38US 8,156,754 B2Denso Corporation · 2012
- Heat exchanger tube with integral restricting and turbulating structure35US 7,255,155 B2Beckett Gas, Inc. · 2007