F28
Heat exchange in general
F28 (Heat exchange in general) appears on 34,968 US grants and 35,863 published applications in this corpus.
Search patents in F28- Granted patents
- 34,968
- Published applications
- 35,863
- Assignees
- 10,862
- Inventors
- 61,590
- Latest grant
- 6 Oct 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 339 | 0 |
| 1977 | 356 | 0 |
| 1978 | 390 | 0 |
| 1979 | 308 | 0 |
| 1980 | 422 | 0 |
| 1981 | 499 | 0 |
| 1982 | 442 | 0 |
| 1983 | 435 | 0 |
| 1984 | 440 | 0 |
| 1985 | 440 | 0 |
| 1986 | 434 | 0 |
| 1987 | 459 | 0 |
| 1988 | 386 | 0 |
| 1989 | 410 | 0 |
| 1990 | 376 | 0 |
| 1991 | 419 | 0 |
| 1992 | 416 | 0 |
| 1993 | 454 | 0 |
| 1994 | 468 | 0 |
| 1995 | 402 | 0 |
| 1996 | 457 | 0 |
| 1997 | 431 | 0 |
| 1998 | 588 | 0 |
| 1999 | 562 | 0 |
| 2000 | 586 | 0 |
| 2001 | 708 | 253 |
| 2002 | 577 | 690 |
| 2003 | 615 | 865 |
| 2004 | 607 | 956 |
| 2005 | 614 | 1195 |
| 2006 | 750 | 1141 |
| 2007 | 583 | 1232 |
| 2008 | 458 | 1234 |
| 2009 | 500 | 1294 |
| 2010 | 635 | 1466 |
| 2011 | 622 | 1460 |
| 2012 | 662 | 1449 |
| 2013 | 754 | 1687 |
| 2014 | 831 | 1743 |
| 2015 | 961 | 1730 |
| 2016 | 1093 | 1719 |
| 2017 | 1328 | 1704 |
| 2018 | 1432 | 1778 |
| 2019 | 1679 | 1900 |
| 2020 | 1526 | 1851 |
| 2021 | 1418 | 1614 |
| 2022 | 1328 | 1656 |
| 2023 | 1191 | 1477 |
| 2024 | 1278 | 1457 |
| 2025 | 1179 | 1351 |
| 2026 | 720 | 961 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subclasses
Granted patents
- F28FDetails of heat-exchange and heat-transfer apparatus, of general application23,598
- F28DHeat-exchange apparatus, not provided for in another subclass, in which the heat-exchange22,995
- F28GCleaning of internal or external surfaces of heat-exchange or heat-transfer conduits1,463
- F28CHeat-exchange apparatus, not provided for in another subclass, in which the heat-exchange1,272
- F28BSteam or vapour condensers969
Recent patents
- Condensation dedust-demister set6 Oct 2026US 12,752,224 B2
- Additively manufactured heat exchanger and diffuser pipe coupled to a compressor stage6 Oct 2026US 12,752,921 B2Hamilton Sundstrand Corporation
- Heat exchanger6 Oct 2026US 12,753,336 B2Daikin Industries, Ltd.
- Thermal energy storage system coupled with a solid oxide electrolysis system6 Oct 2026US 12,753,710 B2Rondo Energy, Inc.
- Cooling recovery system and method6 Oct 2026US 12,753,937 B2Heds Holdings LLC
- Heat pump air-conditioning system and vehicle8 Oct 2026US 2026/0307459 A1Beijing CHJ Information Technology Co., LTD.
- Exhaust heat recovery device8 Oct 2026US 2026/0309067 A1
- Economizer and boiler8 Oct 2026US 2026/0309323 A1Kurita Water Industries Ltd.
- Power generation system8 Oct 2026US 2026/0309424 A1Samsung Electronics Co., Ltd.
- Sheet membrane apparatus8 Oct 2026US 2026/0309425 A1Baltimore Aircoil Company, Inc.
Most cited
By later US patents
- Electronic device806US 9,313,915 B2ASUSTek · 2016
- System for monitoring health, wellness and fitness having a method and apparatus for improved measurement of heat flow688US 6,595,929 B2BodyMedia, Inc. · 2003
- Computing infrastructure672US 8,706,914 B22014
- Forming structures from CAD solid models580US 6,391,251 B1Optomec Design Company · 2002
- Apparatus for absorbing and dissipating excess heat generated by a system553US 7,593,230 B2Sensys Medical, Inc. · 2009