F24F 3/044
Systems in which all treatment is given in the central station, i.e.
Official title: Systems in which all treatment is given in the central station, i.e. all-air systems
F24F3/044 (Systems in which all treatment is given in the central station, i.e.) appears on 759 US grants and 676 published applications in this corpus.
Search patents in F24F- Granted patents
- 759
- Published applications
- 676
- Assignees
- 328
- Inventors
- 1,369
- Latest grant
- 6 Oct 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 13 | 0 |
| 1977 | 11 | 0 |
| 1978 | 11 | 0 |
| 1979 | 4 | 0 |
| 1980 | 14 | 0 |
| 1981 | 14 | 0 |
| 1982 | 7 | 0 |
| 1983 | 8 | 0 |
| 1984 | 5 | 0 |
| 1985 | 13 | 0 |
| 1986 | 8 | 0 |
| 1987 | 8 | 0 |
| 1988 | 9 | 0 |
| 1989 | 17 | 0 |
| 1990 | 11 | 0 |
| 1991 | 11 | 0 |
| 1992 | 9 | 0 |
| 1993 | 6 | 0 |
| 1994 | 14 | 0 |
| 1995 | 9 | 0 |
| 1996 | 12 | 0 |
| 1997 | 11 | 0 |
| 1998 | 13 | 0 |
| 1999 | 4 | 0 |
| 2000 | 13 | 0 |
| 2001 | 11 | 2 |
| 2002 | 9 | 4 |
| 2003 | 3 | 18 |
| 2004 | 12 | 13 |
| 2005 | 7 | 21 |
| 2006 | 13 | 11 |
| 2007 | 5 | 17 |
| 2008 | 7 | 7 |
| 2009 | 9 | 12 |
| 2010 | 8 | 19 |
| 2011 | 6 | 24 |
| 2012 | 14 | 28 |
| 2013 | 13 | 20 |
| 2014 | 14 | 29 |
| 2015 | 25 | 40 |
| 2016 | 23 | 30 |
| 2017 | 25 | 34 |
| 2018 | 29 | 34 |
| 2019 | 49 | 46 |
| 2020 | 31 | 63 |
| 2021 | 35 | 55 |
| 2022 | 33 | 46 |
| 2023 | 41 | 42 |
| 2024 | 35 | 27 |
| 2025 | 33 | 27 |
| 2026 | 14 | 7 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
- F24F 3/0442With volume control at a constant temperature194
- F24F 3/048With temperature control at constant rate of air-flow115
- F24F 3/056The air at least partially flowing over lighting fixtures, the heat of54
- F24F 2003/0446With a single air duct for transporting treated air from the centralIndexing code39
- F24F 2003/0448With two air ducts for separately transporting treated hot and cold airIndexing code7
Recent patents
- Combustion heater and air conditioning system6 Oct 2026US 12,753,936 B2Daikin Industries, Ltd.
- HVAC system using reheat from alternative heat source15 Sep 2026US 12,736,236 B2Tyco Fire & Security GmbH
- Methods and systems for controlling an HVAC system to identify energy usage under different control strategies18 Aug 2026US 12,710,186 B2Honeywell International Inc.
- Hybrid heating and cooling system7 Jul 2026US 12,674,588 B2Seeley International Pty Ltd
- Filtration of HVAC system for improved indoor air quality7 Apr 2026US 12,595,919 B2Carrier Corporation
- Air Handling Unit Construction21 May 2026US 2026/0139870 A1Innovative Climatic Technologies Corporation dba Air2O
- Hvac system with wireless damper and zoning control7 May 2026US 2026/0126201 A1Lennox Industries Inc.
- Tempering assembly for tempering air of a facility and corresponding method30 Apr 2026US 2026/0117993 A1Glacies Technologies Inc.
- Clean room facility16 Apr 2026US 2026/0104171 A1Hitachi Global Life Solutions, Inc.
- Systems and Methods for Commercial Airstreem Pretreatment5 Mar 2026US 2026/0063312 A1
Most cited
By later US patents
- Forced-air zone climate control system for existing residential houses268US 6,983,889 B2Home Comfort Zones, Inc. · 2006
- Dwelling heating and air conditioning system265US 5,348,078 A1994
- Air conditioning method in machine room having forced air-cooling equipment housed therein247US 5,718,628 ANippon Telegraph and Telephone Corporation · 1998
- Self configuring controller243US 5,276,630 AAmerican Standard Inc. · 1994
- Remote temperature sensing transmitting and programmable thermostat system240US 6,213,404 B12001