A42B 3/281
Air ducting systems
Official title: {Air ducting systems}
A42B3/281 (Air ducting systems) appears on 269 US grants and 320 published applications in this corpus.
Search patents in A42B- Granted patents
- 269
- Published applications
- 320
- Assignees
- 118
- Inventors
- 394
- Latest grant
- 15 Sep 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1977 | 1 | 0 |
| 1978 | 1 | 0 |
| 1979 | 1 | 0 |
| 1980 | 0 | 0 |
| 1981 | 0 | 0 |
| 1982 | 0 | 0 |
| 1983 | 0 | 0 |
| 1984 | 1 | 0 |
| 1985 | 3 | 0 |
| 1986 | 4 | 0 |
| 1987 | 4 | 0 |
| 1988 | 3 | 0 |
| 1989 | 1 | 0 |
| 1990 | 2 | 0 |
| 1991 | 4 | 0 |
| 1992 | 9 | 0 |
| 1993 | 1 | 0 |
| 1994 | 2 | 0 |
| 1995 | 4 | 0 |
| 1996 | 0 | 0 |
| 1997 | 1 | 0 |
| 1998 | 2 | 0 |
| 1999 | 5 | 0 |
| 2000 | 4 | 0 |
| 2001 | 5 | 1 |
| 2002 | 2 | 3 |
| 2003 | 1 | 1 |
| 2004 | 3 | 7 |
| 2005 | 4 | 4 |
| 2006 | 0 | 2 |
| 2007 | 1 | 11 |
| 2008 | 1 | 5 |
| 2009 | 0 | 0 |
| 2010 | 5 | 4 |
| 2011 | 3 | 2 |
| 2012 | 6 | 3 |
| 2013 | 0 | 10 |
| 2014 | 3 | 5 |
| 2015 | 1 | 9 |
| 2016 | 12 | 24 |
| 2017 | 11 | 31 |
| 2018 | 12 | 30 |
| 2019 | 24 | 34 |
| 2020 | 27 | 23 |
| 2021 | 21 | 21 |
| 2022 | 18 | 23 |
| 2023 | 18 | 18 |
| 2024 | 10 | 11 |
| 2025 | 14 | 23 |
| 2026 | 14 | 15 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Hard hat with fan15 Sep 2026US 12,733,705 B2Milwaukee Electric Tool Corporation
- Hardhat with air conduit15 Sep 2026US 12,734,377 B23M Innovative Properties Company
- Surf and water sports helmet25 Aug 2026US 12,714,177 B1
- Head protection device with holding unit and protection unit4 Aug 2026US 12,696,948 B2Optrel Holding AG
- Protective cap28 Jul 2026US 12,690,636 B2Milwaukee Electric Tool Corporation
Most cited
By later US patents
- Protective crash helmet146US 4,586,200 A1986
- Bicyclists helmet with air flow and perspiration control137US 4,434,514 ABell Helmets Inc. · 1984
- Helmet121US 5,915,537 ARed Corporation · 1999
- Multiple density helmet body compositions to strengthen helmet103US 5,309,576 ABell Helmets Inc. · 1994
- Safety helmet and a head protector therefor96US 5,867,840 AShoei Kako Kabushiki Kaisha · 1999