F24F 3/001
In which the air treatment in the central station takes place by
Official title: {in which the air treatment in the central station takes place by means of a heat-pump or by means of a reversible cycle (reversible cycle for humidifying and drying air F24F3/147)}
F24F3/001 (In which the air treatment in the central station takes place by) appears on 180 US grants and 180 published applications in this corpus.
Search patents in F24F- Granted patents
- 180
- Published applications
- 180
- Assignees
- 107
- Inventors
- 476
- Latest grant
- 8 Sep 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 2 | 0 |
| 1977 | 1 | 0 |
| 1978 | 4 | 0 |
| 1979 | 6 | 0 |
| 1980 | 5 | 0 |
| 1981 | 3 | 0 |
| 1982 | 2 | 0 |
| 1983 | 2 | 0 |
| 1984 | 5 | 0 |
| 1985 | 3 | 0 |
| 1986 | 3 | 0 |
| 1987 | 2 | 0 |
| 1988 | 5 | 0 |
| 1989 | 2 | 0 |
| 1990 | 2 | 0 |
| 1991 | 1 | 0 |
| 1992 | 0 | 0 |
| 1993 | 0 | 0 |
| 1994 | 2 | 0 |
| 1995 | 1 | 0 |
| 1996 | 0 | 0 |
| 1997 | 0 | 0 |
| 1998 | 0 | 0 |
| 1999 | 0 | 0 |
| 2000 | 0 | 0 |
| 2001 | 2 | 1 |
| 2002 | 1 | 2 |
| 2003 | 1 | 0 |
| 2004 | 0 | 2 |
| 2005 | 1 | 1 |
| 2006 | 1 | 6 |
| 2007 | 0 | 4 |
| 2008 | 3 | 3 |
| 2009 | 1 | 6 |
| 2010 | 3 | 4 |
| 2011 | 2 | 3 |
| 2012 | 1 | 3 |
| 2013 | 3 | 0 |
| 2014 | 2 | 4 |
| 2015 | 1 | 4 |
| 2016 | 1 | 6 |
| 2017 | 2 | 10 |
| 2018 | 9 | 8 |
| 2019 | 10 | 14 |
| 2020 | 11 | 23 |
| 2021 | 15 | 7 |
| 2022 | 7 | 25 |
| 2023 | 17 | 15 |
| 2024 | 15 | 14 |
| 2025 | 12 | 9 |
| 2026 | 8 | 6 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
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- Virtual superheat measurement sensor for refrigeration cycle28 Jul 2026US 12,693,033 B2NUtech Ventures
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- Terminal unit and method for improved indoor cooling19 May 2026US 12,631,368 B2FT Energy Controls, LLC
- Method and computer program product for evacuation of contaminated air and prevention of ignition in an air handling system7 Apr 2026US 12,595,922 B2FläKtgroup Sweden AB
- Defrost control and management for heat pump applications17 Sep 2026US 2026/0276231 A1Daikin Comfort Technologies Manufacturing, L.P.
- Multi-circuit heat pump systems with improved defrost and hot gas reheat modes20 Aug 2026US 2026/0243456 A1Daikin Comfort Technologies Manufacturing, L.P.
- Heat pump system with combustion heating4 Jun 2026US 2026/0153256 A1Midea Group Co., Ltd.
- Directional Valve for a Heat Pump and Heat Pump28 May 2026US 2026/0146677 A1Viessmann Holding International GmbH
- Advanced Hybrid Geothermal, Air Source, Water Source Systems And Methods21 May 2026US 2026/0139852 A1Heds Holdings LLC
Most cited
By later US patents
- Duct type multizone air conditioning system135US 4,716,957 AMitsubishi Denki Kabushiki Kaisha · 1988
- Method and apparatus for controlling a multi-source heating system85US 6,874,693 B2Honeywell International Inc. · 2005
- Air conditioning apparatus for distributing primarily-conditioned air to rooms82US 5,344,069 AKabushiki Kaisha Toshiba · 1994
- Refrigeration heat pump and auxiliary heating apparatus control system with switchover during low outdoor temperature79US 4,598,764 AHoneywell Inc. · 1986
- Integrated system for heating, cooling and heat recovery ventilation61US 6,347,527 B12002