E04B 9/0421
Comprising ducts
Official title: {comprising ducts}
E04B9/0421 (Comprising ducts) appears on 30 US grants and 33 published applications in this corpus.
Search patents in E04B- Granted patents
- 30
- Published applications
- 33
- Assignees
- 18
- Inventors
- 66
- Latest grant
- 10 Mar 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1979 | 1 | 0 |
| 1980 | 1 | 0 |
| 1981 | 0 | 0 |
| 1982 | 0 | 0 |
| 1983 | 0 | 0 |
| 1984 | 1 | 0 |
| 1985 | 0 | 0 |
| 1986 | 0 | 0 |
| 1987 | 2 | 0 |
| 1988 | 0 | 0 |
| 1989 | 0 | 0 |
| 1990 | 0 | 0 |
| 1991 | 2 | 0 |
| 1992 | 0 | 0 |
| 1993 | 0 | 0 |
| 1994 | 0 | 0 |
| 1995 | 0 | 0 |
| 1996 | 0 | 0 |
| 1997 | 0 | 0 |
| 1998 | 0 | 0 |
| 1999 | 0 | 0 |
| 2000 | 0 | 0 |
| 2001 | 0 | 0 |
| 2002 | 0 | 0 |
| 2003 | 1 | 1 |
| 2004 | 0 | 0 |
| 2005 | 0 | 0 |
| 2006 | 1 | 1 |
| 2007 | 0 | 0 |
| 2008 | 0 | 0 |
| 2009 | 0 | 0 |
| 2010 | 0 | 0 |
| 2011 | 0 | 2 |
| 2012 | 1 | 2 |
| 2013 | 0 | 0 |
| 2014 | 1 | 1 |
| 2015 | 1 | 3 |
| 2016 | 2 | 3 |
| 2017 | 1 | 1 |
| 2018 | 3 | 5 |
| 2019 | 2 | 3 |
| 2020 | 2 | 3 |
| 2021 | 1 | 0 |
| 2022 | 2 | 1 |
| 2023 | 1 | 2 |
| 2024 | 2 | 2 |
| 2025 | 1 | 2 |
| 2026 | 1 | 1 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
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- Integrated ceiling and light system17 Sep 2026US 2026/0276162 A1Armstrong World Industries, Inc.
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- Building panel system17 Jul 2025US 2025/0230652 A1Armstrong World Industries, Inc.
- Aeraulic device and radiant ceiling thermal system with internal air mixing7 Nov 2024US 2024/0369244 A1Giacomini S.p. A.
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Most cited
By later US patents
- Hub with locking mechanism31US 8,272,615 B2Flexhead Industries, Inc. · 2012
- Building module for a ceiling30US 4,205,719 A1980
- Ceiling panel25US 4,646,500 AFrenger Troughton Limited · 1987
- Modular, fluid thermal transfer device18US 9,683,756 B2Therma-Hexx, LLC · 2017
- Ceiling leak capture and drainage system13US 6,640,502 B22003