F28C
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 COME INTO DIRECT CONTACT WITHOUT CHEMICAL INTERACTION (safety devices in general F16P; fluid heaters having heat generating means F24H; with an intermediate heat-transfer medium coming into direct contact with heat-exchange media F28D15/00 - F28D19/00; details of heat-exchange apparatus of general application F28F)
F28C (Heat-exchange apparatus, not provided for in another subclass, in which the heat-exchange) appears on 1,272 US grants and 1,099 published applications in this corpus.
Search patents in F28C- Granted patents
- 1,272
- Published applications
- 1,099
- Assignees
- 775
- Inventors
- 2,464
- Latest grant
- 29 Sep 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 38 | 0 |
| 1977 | 27 | 0 |
| 1978 | 30 | 0 |
| 1979 | 12 | 0 |
| 1980 | 20 | 0 |
| 1981 | 30 | 0 |
| 1982 | 22 | 0 |
| 1983 | 20 | 0 |
| 1984 | 28 | 0 |
| 1985 | 17 | 0 |
| 1986 | 18 | 0 |
| 1987 | 14 | 0 |
| 1988 | 21 | 0 |
| 1989 | 12 | 0 |
| 1990 | 15 | 0 |
| 1991 | 13 | 0 |
| 1992 | 8 | 0 |
| 1993 | 12 | 0 |
| 1994 | 10 | 0 |
| 1995 | 14 | 0 |
| 1996 | 16 | 0 |
| 1997 | 12 | 0 |
| 1998 | 26 | 0 |
| 1999 | 15 | 0 |
| 2000 | 13 | 0 |
| 2001 | 16 | 11 |
| 2002 | 14 | 12 |
| 2003 | 16 | 22 |
| 2004 | 12 | 21 |
| 2005 | 15 | 19 |
| 2006 | 20 | 28 |
| 2007 | 14 | 19 |
| 2008 | 9 | 28 |
| 2009 | 13 | 39 |
| 2010 | 12 | 31 |
| 2011 | 20 | 45 |
| 2012 | 26 | 47 |
| 2013 | 30 | 56 |
| 2014 | 32 | 69 |
| 2015 | 45 | 68 |
| 2016 | 51 | 53 |
| 2017 | 63 | 70 |
| 2018 | 40 | 66 |
| 2019 | 65 | 61 |
| 2020 | 65 | 61 |
| 2021 | 45 | 62 |
| 2022 | 52 | 53 |
| 2023 | 40 | 41 |
| 2024 | 43 | 49 |
| 2025 | 34 | 40 |
| 2026 | 17 | 28 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Main groups
Granted patents with any code in the group
Recent patents
- Fresh water evaporative cooling system29 Sep 2026US 12,747,874 B2Bessamaire Sales LLC
- Drying apparatus and system for preparing batteries29 Sep 2026US 12,747,915 B2Contemporary Amperex Technology (Hong Kong) Limited
- Liquid collector25 Aug 2026US 12,714,959 B2Baltimore Aircoil Company, Inc.
- System and methods utilizing fluid coolers and chillers to perform in-series heat rejection and trim cooling25 Aug 2026US 12,716,598 B2Inertech IP LLC
- Systems, methods and devices for cooling tower maintenance and repair4 Aug 2026US 12,698,941 B2
- Power generation system8 Oct 2026US 2026/0309424 A1Samsung Electronics Co., Ltd.
- Heat rejection apparatus17 Sep 2026US 2026/0276309 A1
- Microstructure for a fill sheet13 Aug 2026US 2026/0233191 A1Brentwood Industries, Inc.
- Rapid Thermal Conversion of Biomass13 Aug 2026US 2026/0234476 A1Ensyn Renewables, Inc.
- Cooling arrangement and method for cooling at least one oil-to-air external heat exchanger6 Aug 2026US 2026/0227131 A1Hitachi Energy Ltd
Most cited
By later US patents
- Rapid thermal conversion of biomass165US 7,905,990 B2Ensyn Renewables, Inc. · 2011
- Direct quench apparatus147US 3,959,420 AStone & Webster Engineering Corp. · 1976
- Heat transfer and storage system124US 4,727,930 AThe Board of Regents of the University of Washington · 1988
- Combination direct and indirect closed circuit evaporative heat exchanger with blow-through fan99US 5,724,828 ABaltimore Aircoil Company, Inc. · 1998
- Tower packing material and method91US 4,604,247 AGlitsch, Inc. · 1986