F28F 1/42
The means being both outside and inside the tubular element
Official title: the means being both outside and inside the tubular element
F28F1/42 (The means being both outside and inside the tubular element) appears on 356 US grants and 415 published applications in this corpus.
Search patents in F28F- Granted patents
- 356
- Published applications
- 415
- Assignees
- 249
- Inventors
- 1,001
- Latest grant
- 25 Aug 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1977 | 3 | 0 |
| 1978 | 4 | 0 |
| 1979 | 2 | 0 |
| 1980 | 3 | 0 |
| 1981 | 7 | 0 |
| 1982 | 8 | 0 |
| 1983 | 5 | 0 |
| 1984 | 6 | 0 |
| 1985 | 1 | 0 |
| 1986 | 1 | 0 |
| 1987 | 6 | 0 |
| 1988 | 5 | 0 |
| 1989 | 5 | 0 |
| 1990 | 3 | 0 |
| 1991 | 3 | 0 |
| 1992 | 3 | 0 |
| 1993 | 2 | 0 |
| 1994 | 2 | 0 |
| 1995 | 3 | 0 |
| 1996 | 3 | 0 |
| 1997 | 7 | 0 |
| 1998 | 9 | 0 |
| 1999 | 6 | 0 |
| 2000 | 5 | 0 |
| 2001 | 6 | 2 |
| 2002 | 5 | 8 |
| 2003 | 5 | 11 |
| 2004 | 4 | 6 |
| 2005 | 5 | 17 |
| 2006 | 5 | 13 |
| 2007 | 9 | 17 |
| 2008 | 4 | 10 |
| 2009 | 6 | 19 |
| 2010 | 2 | 16 |
| 2011 | 4 | 24 |
| 2012 | 8 | 14 |
| 2013 | 7 | 17 |
| 2014 | 7 | 27 |
| 2015 | 12 | 22 |
| 2016 | 9 | 13 |
| 2017 | 28 | 18 |
| 2018 | 15 | 23 |
| 2019 | 18 | 21 |
| 2020 | 11 | 23 |
| 2021 | 25 | 32 |
| 2022 | 20 | 14 |
| 2023 | 9 | 15 |
| 2024 | 13 | 15 |
| 2025 | 13 | 12 |
| 2026 | 4 | 6 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Advanced disturbance elements for improving pipe performance25 Aug 2026US 12,716,661 B2Valeo Systemes Thermiques
- Method for producing pipes having topographic inner structures2 Jun 2026US 12,644,654 B2Karlsruher Institut Fuer Technologie
- Double-tube heat exchanger and manufacturing method therefor26 May 2026US 12,638,241 B2Sumitomo Riko Company Limited
- Grey water heat recovery apparatus24 Feb 2026US 12,560,390 B2Consat AB
- Heat exchanger with varying surface roughness19 Aug 2025US 12,392,567 B2DENSO International America, Inc.
- Fin architecture for promoting heat exchange16 Jul 2026US 2026/0202148 A1
- Heat exchanger tube25 Jun 2026US 2026/0177333 A1Wieland-Werke AG
- Tubular element for a heat exchanger18 Jun 2026US 2026/0168745 A1Valeo Systemes Thermiques
- Thermal Buffer Device for Rapid, Non-Dilutive Cooling of Beverages28 May 2026US 2026/0146804 A1
- Dimple turbular heat exchanger used for apu7 May 2026US 2026/0129797 A1Honeywell International Inc.
Most cited
By later US patents
- Load bearing element and a method for manufacturing a load bearing element119US 10,081,431 B2Airbus Operations GmbH · 2018
- Heat transfer tube having internal ridges, and method of making same84US 4,660,630 AWolverine Tube, Inc. · 1987
- Heat transfer tubes and methods of fabrication thereof67US 5,697,430 AWolverine Tube, Inc. · 1997
- Turbogenerator cooling system65US 6,657,332 B2Capstone Turbine Corporation · 2003
- Tube provided with inner fins and outer fins or pins, particularly for heat exchangers, and method therefor61US 4,306,619 A1981