F28D
Heat-exchange apparatus, not provided for in another subclass, in which the heat-exchange
Official title: HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT (fluid heaters having heat generating means and heat transferring means F24H; furnaces F27; details of heat-exchange apparatus of general)
F28D (Heat-exchange apparatus, not provided for in another subclass, in which the heat-exchange) appears on 22,995 US grants and 26,164 published applications in this corpus.
Search patents in F28D- Granted patents
- 22,995
- Published applications
- 26,164
- Assignees
- 7,724
- Inventors
- 42,662
- Latest grant
- 6 Oct 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 182 | 0 |
| 1977 | 217 | 0 |
| 1978 | 226 | 0 |
| 1979 | 170 | 0 |
| 1980 | 232 | 0 |
| 1981 | 303 | 0 |
| 1982 | 258 | 0 |
| 1983 | 250 | 0 |
| 1984 | 260 | 0 |
| 1985 | 240 | 0 |
| 1986 | 217 | 0 |
| 1987 | 221 | 0 |
| 1988 | 164 | 0 |
| 1989 | 209 | 0 |
| 1990 | 207 | 0 |
| 1991 | 214 | 0 |
| 1992 | 216 | 0 |
| 1993 | 228 | 0 |
| 1994 | 244 | 0 |
| 1995 | 223 | 0 |
| 1996 | 237 | 0 |
| 1997 | 234 | 0 |
| 1998 | 298 | 0 |
| 1999 | 296 | 0 |
| 2000 | 363 | 0 |
| 2001 | 445 | 168 |
| 2002 | 359 | 455 |
| 2003 | 386 | 557 |
| 2004 | 392 | 648 |
| 2005 | 419 | 808 |
| 2006 | 534 | 806 |
| 2007 | 401 | 925 |
| 2008 | 321 | 912 |
| 2009 | 336 | 896 |
| 2010 | 467 | 1035 |
| 2011 | 449 | 1084 |
| 2012 | 432 | 1090 |
| 2013 | 532 | 1165 |
| 2014 | 566 | 1214 |
| 2015 | 652 | 1257 |
| 2016 | 732 | 1271 |
| 2017 | 912 | 1243 |
| 2018 | 1036 | 1305 |
| 2019 | 1231 | 1411 |
| 2020 | 1095 | 1397 |
| 2021 | 1069 | 1219 |
| 2022 | 993 | 1290 |
| 2023 | 898 | 1163 |
| 2024 | 990 | 1105 |
| 2025 | 924 | 1042 |
| 2026 | 515 | 698 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Main groups
Granted patents with any code in the group
- F28D 21/00Heat-exchange apparatus not covered by any of the groups f28d1/00 - f28d20/007,351
- F28D 15/00Heat-exchange apparatus with the intermediate heat-transfer medium in closed tubes passing into5,474
- F28D 1/00Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the5,411
- F28D 7/00Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the4,707
- F28D 9/00Heat-exchange apparatus having stationary plate-like or laminated conduit assemblies for both heat-exchange3,152
- F28D 20/00Heat storage plants or apparatus in general3,112
- F28D 5/00Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the599
- F28D 19/00Regenerative heat-exchange apparatus in which the intermediate heat-transfer medium or body is587
All 12 main groupsShow fewer
- F28D 17/00Regenerative heat-exchange apparatus in which a stationary intermediate heat-transfer medium or body352
- F28D 3/00Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the258
- F28D 13/00Heat-exchange apparatus using a fluidised bed209
- F28D 11/00Heat-exchange apparatus employing moving conduits201
Recent patents
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- Thermal energy storage system coupled with a solid oxide electrolysis system6 Oct 2026US 12,753,710 B2Rondo Energy, Inc.
- Method, controller and system of controlling thermal power transfer through a thermal energy exchanger6 Oct 2026US 12,753,941 B2Belimo Holding AG
- Cooling module6 Oct 2026US 12,753,974 B2Hanon Systems
- Controllable injection for implementing different local refrigerant distribution6 Oct 2026US 12,753,975 B2Linde Aktiengesellschaft
- 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
- Sheet membrane apparatus8 Oct 2026US 2026/0309425 A1Baltimore Aircoil Company, Inc.
- Composite Heat Exchanger8 Oct 2026US 2026/0309426 A1Hyundai Wia Corporation
- Heat exchanger for automobiles8 Oct 2026US 2026/0309427 A1Estra Automotive Systems Co., Ltd.
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
- Cooling disk unit for use in a wafer chucking device535US 6,499,533 B2Sumitomo Heavy Industries, Ltd. · 2002
- Susceptor heater and method of heating a substrate522US 8,933,375 B2ASM IP Holding B. V. · 2015