F24F 11/81
By controlling the air supply to heat-exchangers or bypass channels
Official title: by controlling the air supply to heat-exchangers or bypass channels
F24F11/81 (By controlling the air supply to heat-exchangers or bypass channels) appears on 292 US grants and 280 published applications in this corpus.
Search patents in F24F- Granted patents
- 292
- Published applications
- 280
- Assignees
- 143
- Inventors
- 705
- Latest grant
- 22 Sep 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 4 | 0 |
| 1977 | 7 | 0 |
| 1978 | 3 | 0 |
| 1979 | 3 | 0 |
| 1980 | 1 | 0 |
| 1981 | 4 | 0 |
| 1982 | 1 | 0 |
| 1983 | 1 | 0 |
| 1984 | 4 | 0 |
| 1985 | 4 | 0 |
| 1986 | 1 | 0 |
| 1987 | 2 | 0 |
| 1988 | 2 | 0 |
| 1989 | 3 | 0 |
| 1990 | 5 | 0 |
| 1991 | 1 | 0 |
| 1992 | 4 | 0 |
| 1993 | 5 | 0 |
| 1994 | 10 | 0 |
| 1995 | 1 | 0 |
| 1996 | 5 | 0 |
| 1997 | 2 | 0 |
| 1998 | 1 | 0 |
| 1999 | 0 | 0 |
| 2000 | 3 | 0 |
| 2001 | 1 | 3 |
| 2002 | 5 | 1 |
| 2003 | 0 | 1 |
| 2004 | 4 | 2 |
| 2005 | 1 | 1 |
| 2006 | 2 | 1 |
| 2007 | 1 | 1 |
| 2008 | 0 | 3 |
| 2009 | 0 | 1 |
| 2010 | 1 | 7 |
| 2011 | 1 | 4 |
| 2012 | 4 | 5 |
| 2013 | 2 | 6 |
| 2014 | 4 | 19 |
| 2015 | 6 | 15 |
| 2016 | 13 | 15 |
| 2017 | 22 | 23 |
| 2018 | 13 | 16 |
| 2019 | 22 | 20 |
| 2020 | 16 | 26 |
| 2021 | 20 | 21 |
| 2022 | 19 | 18 |
| 2023 | 21 | 24 |
| 2024 | 16 | 19 |
| 2025 | 12 | 21 |
| 2026 | 9 | 7 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Air conditioner22 Sep 2026US 12,742,565 B2Mitsubishi Electric Corporation
- Electrical relay switch for a blower of a climate control system4 Aug 2026US 12,698,920 B2Trane International Inc.
- Refrigerant detection and control of HVAC system7 Jul 2026US 12,674,597 B2Tyco Fire & Security GmbH
- HVAC dynamic air volume correction9 Jun 2026US 12,650,238 B2FrostFire Services Inc.
- System and method for data-driven control of an air-conditioning system19 May 2026US 12,632,016 B2Mitsubishi Electric Research Laboratories, Inc.
- Air conditioner and method for drying evaporative condenser of air conditioner2 Jul 2026US 2026/0185733 A1Kyungdong Navien Co., Ltd.
- Control scheme for automatic fan mode for use with variable refrigerant flow systems18 Jun 2026US 2026/0168717 A1Lennox Industries Inc.
- Hybrid heating system with humidity control4 Jun 2026US 2026/0153253 A1Midea Group Co., Ltd.
- Air conditioner4 Jun 2026US 2026/0153255 A1Mitsubishi Electric Corporation
- Heat pump system with combustion heating4 Jun 2026US 2026/0153256 A1Midea Group Co., Ltd.
Most cited
By later US patents
- Dynamically controlled environmental control system176US 5,344,068 AStaefa Control System, Inc. · 1994
- Air conditioner and controller for active dehumidification while using ambient air to prevent overcooling159US 6,427,454 B12002
- Air conditioning system with variable condenser reheat for enhanced dehumidification125US 6,826,921 B1Lennox Industries Inc. · 2004
- Cooling control system and expansion valve therefor118US 4,506,518 APacific Industrial Co., Ltd. · 1985
- Microcomputer control for an inverter-driven heat pump106US 4,257,238 ABorg-Warner Corporation · 1981