F24F 7/08
With separate ducts for supplied and exhausted air with provisions for reversal
Official title: with separate ducts for supplied and exhausted air {with provisions for reversal of the input and output systems}
F24F7/08 (With separate ducts for supplied and exhausted air with provisions for reversal) appears on 296 US grants and 380 published applications in this corpus.
Search patents in F24F- Granted patents
- 296
- Published applications
- 380
- Assignees
- 196
- Inventors
- 794
- Latest grant
- 29 Sep 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1981 | 3 | 0 |
| 1982 | 2 | 0 |
| 1983 | 2 | 0 |
| 1984 | 2 | 0 |
| 1985 | 4 | 0 |
| 1986 | 2 | 0 |
| 1987 | 2 | 0 |
| 1988 | 3 | 0 |
| 1989 | 1 | 0 |
| 1990 | 1 | 0 |
| 1991 | 9 | 0 |
| 1992 | 3 | 0 |
| 1993 | 6 | 0 |
| 1994 | 6 | 0 |
| 1995 | 3 | 0 |
| 1996 | 2 | 0 |
| 1997 | 2 | 0 |
| 1998 | 4 | 0 |
| 1999 | 0 | 0 |
| 2000 | 1 | 0 |
| 2001 | 1 | 0 |
| 2002 | 0 | 3 |
| 2003 | 1 | 3 |
| 2004 | 3 | 5 |
| 2005 | 2 | 10 |
| 2006 | 3 | 6 |
| 2007 | 2 | 3 |
| 2008 | 4 | 1 |
| 2009 | 5 | 2 |
| 2010 | 0 | 4 |
| 2011 | 1 | 8 |
| 2012 | 1 | 9 |
| 2013 | 3 | 13 |
| 2014 | 7 | 10 |
| 2015 | 11 | 25 |
| 2016 | 6 | 23 |
| 2017 | 15 | 20 |
| 2018 | 10 | 22 |
| 2019 | 24 | 19 |
| 2020 | 16 | 22 |
| 2021 | 15 | 27 |
| 2022 | 17 | 33 |
| 2023 | 16 | 30 |
| 2024 | 28 | 40 |
| 2025 | 28 | 27 |
| 2026 | 19 | 15 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
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Most cited
By later US patents
- Method and apparatus for attachment and evacuation220US 10,751,768 B2Buffalo Filter LLC · 2020
- Method and apparatus for controlling ventilation rates and indoor air quality in an HVAC system120US 5,292,280 AJohnson Service Company · 1994
- Fluid exchanger76US 4,336,748 AAxis Products Limited · 1982
- Air flow control equipment in chemical laboratory buildings71US 5,205,783 AAccu*Aire Systems, Inc. · 1993
- Proportional fluid exchanger and recirculator65US 4,526,318 A1985