F24F 11/74
For controlling air flow rate or air velocity
Official title: for controlling air flow rate or air velocity
F24F11/74 (For controlling air flow rate or air velocity) appears on 2,973 US grants and 3,130 published applications in this corpus.
Search patents in F24F- Granted patents
- 2,973
- Published applications
- 3,130
- Assignees
- 1,069
- Inventors
- 5,862
- Latest grant
- 29 Sep 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 33 | 0 |
| 1977 | 31 | 0 |
| 1978 | 26 | 0 |
| 1979 | 13 | 0 |
| 1980 | 22 | 0 |
| 1981 | 24 | 0 |
| 1982 | 19 | 0 |
| 1983 | 18 | 0 |
| 1984 | 20 | 0 |
| 1985 | 36 | 0 |
| 1986 | 20 | 0 |
| 1987 | 22 | 0 |
| 1988 | 19 | 0 |
| 1989 | 28 | 0 |
| 1990 | 19 | 0 |
| 1991 | 29 | 0 |
| 1992 | 27 | 0 |
| 1993 | 27 | 0 |
| 1994 | 31 | 0 |
| 1995 | 47 | 0 |
| 1996 | 37 | 0 |
| 1997 | 38 | 0 |
| 1998 | 51 | 0 |
| 1999 | 30 | 0 |
| 2000 | 25 | 0 |
| 2001 | 39 | 5 |
| 2002 | 31 | 21 |
| 2003 | 22 | 35 |
| 2004 | 27 | 50 |
| 2005 | 22 | 50 |
| 2006 | 28 | 58 |
| 2007 | 30 | 75 |
| 2008 | 25 | 64 |
| 2009 | 22 | 76 |
| 2010 | 32 | 82 |
| 2011 | 45 | 92 |
| 2012 | 54 | 116 |
| 2013 | 55 | 94 |
| 2014 | 74 | 137 |
| 2015 | 82 | 185 |
| 2016 | 87 | 184 |
| 2017 | 146 | 222 |
| 2018 | 150 | 157 |
| 2019 | 198 | 195 |
| 2020 | 197 | 204 |
| 2021 | 165 | 225 |
| 2022 | 191 | 208 |
| 2023 | 168 | 199 |
| 2024 | 167 | 175 |
| 2025 | 144 | 129 |
| 2026 | 80 | 92 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
- F24F 11/77By controlling the speed of ventilators1,488
- F24F 11/76By means responsive to temperature608
- F24F 11/75For maintaining constant air flow rate or air velocity236
- F24F 11/745The air flow rate increasing with an increase of air-current or wind73
- F24F 11/755For cyclical variation of air flow rate or air velocity37
Recent patents
- System and method for detecting low indoor air quality and enabling ventilation in multi-zone29 Sep 2026US 12,747,881 B2Carrier Corporation
- Indoor air cleaning system8 Sep 2026US 12,729,868 B2Microjet Technology Co., Ltd.
- Methods and systems for controlling an HVAC system to identify energy usage under different control strategies18 Aug 2026US 12,710,186 B2Honeywell International Inc.
- Enhanced HVAC performance monitoring system and method thereof18 Aug 2026US 12,710,188 B2
- Thermostat with demand controlled indoor air quality18 Aug 2026US 12,710,192 B2Tyco Fire & Security GmbH
- Target temperature calculation method, air conditioner, and computer storage medium8 Oct 2026US 2026/0309354 A1Gd Midea Heating & Ventilating Equipment Co., Ltd.
- Electronic control device and air conditioner8 Oct 2026US 2026/0309357 A1Gd Midea Air-Conditioning Equipment Co., Ltd.
- Thermal management system with hybrid circuit for energy storage device in air conditioning system1 Oct 2026US 2026/0298487 A1Carrier Corporation
- Hvac actuator and application-specific integrated circuit for an hvac actuator1 Oct 2026US 2026/0298495 A1Belimo Holding AG
- System and method for generating and applying cycling correction factors for first and second HVAC systems in multistory buildings24 Sep 2026US 2026/0287199 A1Lennox Industries Inc.
Most cited
By later US patents
- Environmental condition control and energy management system and method768US 6,216,956 B1Tocom, Inc. · 2001
- Environmental condition control and energy management system and method470US 5,924,486 ATeCom AS · 1999
- Realtime, location-based cell phone enhancements, uses, and applications357US 8,880,047 B22014
- Open web services-based indoor climate control system352US 7,904,209 B2Syracuse University · 2011
- Adaptable control of HVAC systems341US 5,170,935 AMassachusetts Institute of Technology · 1992