F24D 5/04
With return of the air or the air-heater
Official title: with return of the air or the air-heater
F24D5/04 (With return of the air or the air-heater) appears on 117 US grants and 121 published applications in this corpus.
Search patents in F24D- Granted patents
- 117
- Published applications
- 121
- Assignees
- 66
- Inventors
- 237
- Latest grant
- 14 Jul 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 1 | 0 |
| 1977 | 3 | 0 |
| 1978 | 5 | 0 |
| 1979 | 4 | 0 |
| 1980 | 2 | 0 |
| 1981 | 1 | 0 |
| 1982 | 2 | 0 |
| 1983 | 0 | 0 |
| 1984 | 1 | 0 |
| 1985 | 4 | 0 |
| 1986 | 1 | 0 |
| 1987 | 1 | 0 |
| 1988 | 2 | 0 |
| 1989 | 0 | 0 |
| 1990 | 1 | 0 |
| 1991 | 0 | 0 |
| 1992 | 0 | 0 |
| 1993 | 1 | 0 |
| 1994 | 0 | 0 |
| 1995 | 0 | 0 |
| 1996 | 0 | 0 |
| 1997 | 1 | 0 |
| 1998 | 0 | 0 |
| 1999 | 0 | 0 |
| 2000 | 0 | 0 |
| 2001 | 1 | 0 |
| 2002 | 1 | 0 |
| 2003 | 0 | 0 |
| 2004 | 0 | 0 |
| 2005 | 0 | 2 |
| 2006 | 0 | 0 |
| 2007 | 1 | 0 |
| 2008 | 0 | 1 |
| 2009 | 1 | 3 |
| 2010 | 0 | 2 |
| 2011 | 1 | 4 |
| 2012 | 2 | 5 |
| 2013 | 2 | 8 |
| 2014 | 4 | 9 |
| 2015 | 3 | 14 |
| 2016 | 7 | 7 |
| 2017 | 13 | 16 |
| 2018 | 9 | 3 |
| 2019 | 7 | 8 |
| 2020 | 10 | 3 |
| 2021 | 4 | 13 |
| 2022 | 4 | 6 |
| 2023 | 8 | 6 |
| 2024 | 4 | 4 |
| 2025 | 3 | 4 |
| 2026 | 2 | 3 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
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- Cabinet heater plenum thermostat controller12 Aug 2025US 12,385,670 B2The Marley Company
- Multi-zone variable refrigerant flow heating/cooling unit22 Jul 2025US 12,366,370 B2MJC, Inc.
- Climate control system28 Jan 2025US 12,209,764 B2Rheem Manufacturing Company
- Systems and Methods for Modulating Heating and/or Cooling Appliance Control Based on Return Air Temperature27 Aug 2026US 2026/0251337 A1Rheem Manufacturing Company
- Hybrid heating system with humidity control4 Jun 2026US 2026/0153253 A1Midea Group Co., Ltd.
- Air heating apparatus12 Mar 2026US 2026/0071828 A1Kyungdong Navien Co., Ltd.
- Multi-zone variable refrigerant flow heating/cooling unit6 Nov 2025US 2025/0341320 A1MJC, Inc.
- Solar thermal energy collection and storage for heating buildings9 Oct 2025US 2025/0314387 A1
Most cited
By later US patents
- System and method for controlling temperature and humidity132US 6,199,388 B1Semco LLC · 2001
- Air ventilation control system52US 4,776,385 A1988
- Solid refuse furnace42US 4,213,404 AEnergy Alternatives, Inc. · 1980
- Method of solar heating so as to reduce oil and gas consumption39US 3,994,276 A1976
- Systems and methods for fault detection of air handling units37US 8,239,168 B2Johnson Controls Technology Company · 2012