F24F 3/08
With separate supply and return lines for hot and cold heat-exchange fluids
Official title: with separate supply and return lines for hot and cold heat-exchange fluids {i.e. so-called "4-conduit" system}
F24F3/08 (With separate supply and return lines for hot and cold heat-exchange fluids) appears on 65 US grants and 75 published applications in this corpus.
Search patents in F24F- Granted patents
- 65
- Published applications
- 75
- Assignees
- 41
- Inventors
- 159
- Latest grant
- 13 May 2025
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1978 | 1 | 0 |
| 1979 | 0 | 0 |
| 1980 | 0 | 0 |
| 1981 | 0 | 0 |
| 1982 | 0 | 0 |
| 1983 | 2 | 0 |
| 1984 | 1 | 0 |
| 1985 | 1 | 0 |
| 1986 | 0 | 0 |
| 1987 | 0 | 0 |
| 1988 | 0 | 0 |
| 1989 | 2 | 0 |
| 1990 | 1 | 0 |
| 1991 | 2 | 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 | 1 | 0 |
| 2003 | 0 | 0 |
| 2004 | 0 | 2 |
| 2005 | 0 | 1 |
| 2006 | 0 | 0 |
| 2007 | 1 | 0 |
| 2008 | 0 | 0 |
| 2009 | 0 | 0 |
| 2010 | 0 | 7 |
| 2011 | 0 | 5 |
| 2012 | 0 | 3 |
| 2013 | 0 | 4 |
| 2014 | 0 | 2 |
| 2015 | 0 | 8 |
| 2016 | 2 | 5 |
| 2017 | 9 | 6 |
| 2018 | 4 | 2 |
| 2019 | 7 | 10 |
| 2020 | 5 | 4 |
| 2021 | 8 | 4 |
| 2022 | 4 | 4 |
| 2023 | 7 | 3 |
| 2024 | 3 | 2 |
| 2025 | 3 | 2 |
| 2026 | 0 | 1 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Valve system and methods13 May 2025US 12,298,030 B2
- System and method for heating and cooling4 Feb 2025US 12,215,886 B2Daikin Industries, Ltd.
- Valve system and methods21 Jan 2025US 12,203,678 B2
- Relay unit and air-conditioning apparatus including the same9 Jul 2024US 12,031,758 B2Mitsubishi Electric Corporation
- Refrigeration system28 May 2024US 11,994,318 B2Haier Smart Home Co., Ltd.
- Selectively operable heating and cooling system and method of operating thereof14 May 2026US 2026/0132939 A1Trane International Inc.
- Valve System and Methods28 Aug 2025US 2025/0271153 A1
- System and method for heating and cooling5 Jun 2025US 2025/0180228 A1Daikin Industries, Ltd.
- Valve System and Methods28 Nov 2024US 2024/0392980 A1
- System and method for heating and cooling11 Apr 2024US 2024/0117976 A1Daikin Industries, Ltd.
Most cited
By later US patents
- HVAC system and zone control unit39US 9,677,777 B2HVAC MFG, Inc. · 2017
- Air conditioning system and method32US 4,559,788 A1985
- Air conditioning system for buildings31US 4,843,832 ASinko Kogyo Co., Ltd. · 1989
- Air conditioning system30US 5,107,687 AVentilplafon, S.A. · 1992
- Heating and cooling systems28US 5,070,704 AMultistack Pty. Ltd. · 1991