F28F 1/006
Tubular elements: with variable shape
Official title: {with variable shape, e.g. with modified tube ends, with different geometrical features (F28F1/025, F28F1/06, F28F1/08, F28F9/16, F28F9/18 take precedence)}
F28F1/006 (Tubular elements: with variable shape) appears on 132 US grants and 188 published applications in this corpus.
Search patents in F28F- Granted patents
- 132
- Published applications
- 188
- Assignees
- 125
- Inventors
- 454
- Latest grant
- 25 Aug 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1977 | 1 | 0 |
| 1978 | 1 | 0 |
| 1979 | 0 | 0 |
| 1980 | 0 | 0 |
| 1981 | 1 | 0 |
| 1982 | 1 | 0 |
| 1983 | 1 | 0 |
| 1984 | 1 | 0 |
| 1985 | 1 | 0 |
| 1986 | 1 | 0 |
| 1987 | 1 | 0 |
| 1988 | 2 | 0 |
| 1989 | 2 | 0 |
| 1990 | 0 | 0 |
| 1991 | 0 | 0 |
| 1992 | 1 | 0 |
| 1993 | 0 | 0 |
| 1994 | 0 | 0 |
| 1995 | 0 | 0 |
| 1996 | 0 | 0 |
| 1997 | 0 | 0 |
| 1998 | 0 | 0 |
| 1999 | 0 | 0 |
| 2000 | 0 | 0 |
| 2001 | 0 | 0 |
| 2002 | 0 | 1 |
| 2003 | 0 | 0 |
| 2004 | 0 | 2 |
| 2005 | 0 | 3 |
| 2006 | 2 | 0 |
| 2007 | 0 | 4 |
| 2008 | 0 | 3 |
| 2009 | 2 | 4 |
| 2010 | 1 | 6 |
| 2011 | 2 | 2 |
| 2012 | 0 | 3 |
| 2013 | 4 | 7 |
| 2014 | 0 | 15 |
| 2015 | 2 | 5 |
| 2016 | 3 | 14 |
| 2017 | 13 | 17 |
| 2018 | 9 | 7 |
| 2019 | 10 | 13 |
| 2020 | 8 | 13 |
| 2021 | 13 | 13 |
| 2022 | 7 | 14 |
| 2023 | 9 | 13 |
| 2024 | 15 | 15 |
| 2025 | 12 | 8 |
| 2026 | 6 | 6 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
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- Cold Brew Percolator Device14 May 2026US 2026/0130535 A1
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Most cited
By later US patents
- Parallel wrapped tube heat exchanger26US 4,785,879 AAPD Cryogenics, Inc. · 1988
- Heat exchanger stack apparatus21US 4,481,771 AStirling Thermal Motors, Inc. · 1984
- Unitary heat exchangers having integrally-formed compliant heat exchanger tubes and heat exchange systems including the same21US 9,752,835 B2Honeywell International Inc. · 2017
- Method for bending tubes20US 5,142,895 AAmana Refrigeration, Inc. · 1992
- Tube in cross-flow conduit heat exchanger20US 9,835,380 B2General Electric Company · 2017