E21F 1/10
Air doors
Official title: Air doors ({E21F1/003 takes precedence; air locks E21F1/145; dam doors E21F17/12}; doors in general E06B)
E21F1/10 (Air doors) appears on 31 US grants and 25 published applications in this corpus.
Search patents in E21F- Granted patents
- 31
- Published applications
- 25
- Assignees
- 12
- Inventors
- 32
- Latest grant
- 11 Feb 2025
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1985 | 1 | 0 |
| 1986 | 0 | 0 |
| 1987 | 0 | 0 |
| 1988 | 0 | 0 |
| 1989 | 0 | 0 |
| 1990 | 1 | 0 |
| 1991 | 0 | 0 |
| 1992 | 0 | 0 |
| 1993 | 2 | 0 |
| 1994 | 0 | 0 |
| 1995 | 0 | 0 |
| 1996 | 0 | 0 |
| 1997 | 0 | 0 |
| 1998 | 0 | 0 |
| 1999 | 1 | 0 |
| 2000 | 2 | 0 |
| 2001 | 0 | 1 |
| 2002 | 3 | 0 |
| 2003 | 1 | 3 |
| 2004 | 0 | 1 |
| 2005 | 2 | 0 |
| 2006 | 0 | 0 |
| 2007 | 0 | 0 |
| 2008 | 0 | 2 |
| 2009 | 0 | 0 |
| 2010 | 1 | 0 |
| 2011 | 0 | 1 |
| 2012 | 0 | 0 |
| 2013 | 0 | 1 |
| 2014 | 2 | 7 |
| 2015 | 1 | 0 |
| 2016 | 3 | 2 |
| 2017 | 3 | 4 |
| 2018 | 2 | 0 |
| 2019 | 2 | 0 |
| 2020 | 1 | 1 |
| 2021 | 0 | 0 |
| 2022 | 1 | 0 |
| 2023 | 0 | 0 |
| 2024 | 1 | 0 |
| 2025 | 1 | 1 |
| 2026 | 0 | 1 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Ventilation method for high gas working face based on alternating intake and air return in mine gallery11 Feb 2025US 12,221,888 B2Taiyuan University of Technology
- Latch assembly for a mine door and a mine door having such an assembly5 Mar 2024US 11,920,390 B1Jack Kennedy Metal Products & Buildings, Inc.
- Sealing system5 Apr 2022US 11,293,285 B2The Secretary of State for Defence
- Mine ventilation door with wings and slidable or pocket personnel door21 Jan 2020US 10,538,956 B2American Mine Door Co.
- Mine door11 Jun 2019US 10,316,663 B2Jack Kennedy Metal Products & Buildings, Inc.
- Ventilation System for Underground Environments29 Jan 2026US 2026/0028911 A1
- Ventilation method for high gas working face based on alternating intake and air return in mine gallery2 Jan 2025US 2025/0003337 A1Taiyuan University of Technology
- Sealing system2 Jul 2020US 2020/0208520 A1The Secretary of State for Defence
- Ventilated mine roof support8 Jun 2017US 2017/0159433 A1Burrell Mining Products, Inc.
- Articulated mine door opening mechanism11 May 2017US 2017/0130506 A1Jack Kennedy Metal Products & Buildings, Inc.
Most cited
By later US patents
- Mine stopping and braces therefor26US 6,846,132 B2Jack Kennedy Metal Products & Buildings, Inc. · 2005
- Power mine door system25US 5,240,349 AJack Kennedy Metal Products & Buildings, Inc. · 1993
- Mine door power drive system22US 6,425,820 B1Jack Kennedy Metal Products & Buildings, Inc. · 2002
- Mine door system18US 4,911,577 AJack Kennedy Metal Products, Inc. · 1990
- Power mine door system15US 5,222,838 AJack Kennedy Metal Products & Buildings, Inc. · 1993