F24F 13/029
Duct comprising an opening for inspection
Official title: {Duct comprising an opening for inspection, e.g. manhole}
F24F13/029 (Duct comprising an opening for inspection) appears on 44 US grants and 41 published applications in this corpus.
Search patents in F24F- Granted patents
- 44
- Published applications
- 41
- Assignees
- 30
- Inventors
- 80
- Latest grant
- 15 Jul 2025
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 1 | 0 |
| 1977 | 0 | 0 |
| 1978 | 0 | 0 |
| 1979 | 1 | 0 |
| 1980 | 3 | 0 |
| 1981 | 0 | 0 |
| 1982 | 1 | 0 |
| 1983 | 0 | 0 |
| 1984 | 0 | 0 |
| 1985 | 0 | 0 |
| 1986 | 1 | 0 |
| 1987 | 1 | 0 |
| 1988 | 1 | 0 |
| 1989 | 0 | 0 |
| 1990 | 0 | 0 |
| 1991 | 1 | 0 |
| 1992 | 0 | 0 |
| 1993 | 0 | 0 |
| 1994 | 0 | 0 |
| 1995 | 0 | 0 |
| 1996 | 0 | 0 |
| 1997 | 0 | 0 |
| 1998 | 0 | 0 |
| 1999 | 1 | 0 |
| 2000 | 0 | 0 |
| 2001 | 0 | 0 |
| 2002 | 0 | 1 |
| 2003 | 0 | 0 |
| 2004 | 1 | 0 |
| 2005 | 0 | 0 |
| 2006 | 0 | 2 |
| 2007 | 0 | 0 |
| 2008 | 0 | 1 |
| 2009 | 0 | 1 |
| 2010 | 0 | 3 |
| 2011 | 0 | 0 |
| 2012 | 1 | 0 |
| 2013 | 0 | 0 |
| 2014 | 2 | 3 |
| 2015 | 1 | 4 |
| 2016 | 1 | 4 |
| 2017 | 0 | 1 |
| 2018 | 1 | 1 |
| 2019 | 1 | 2 |
| 2020 | 2 | 6 |
| 2021 | 5 | 1 |
| 2022 | 2 | 5 |
| 2023 | 8 | 1 |
| 2024 | 5 | 4 |
| 2025 | 3 | 0 |
| 2026 | 0 | 1 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
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Most cited
By later US patents
- Portable window dryer vent43US 4,334,461 A1982
- Access door for air flow conduits32US 5,067,278 ADuro Dyne Corporation · 1991
- Unitized cabinet design22US 4,747,505 AAmerican Standard Inc. · 1988
- Duct access door for circular openings20US 5,901,502 ADuctmate Industries, Inc. · 1999
- Fire resistant access panel for ducts and air handling equipment13US 8,276,319 B2Durasystems Barriers Inc. · 2012