E21F 1/12
Devices for automatically opening air doors
E21F1/12 (Devices for automatically opening air doors) appears on 7 US grants and 7 published applications in this corpus.
Search patents in E21F- Granted patents
- 7
- Published applications
- 7
- Assignees
- 3
- Inventors
- 5
- Latest grant
- 22 Jan 2019
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 2001 | 0 | 1 |
| 2002 | 2 | 0 |
| 2003 | 1 | 1 |
| 2004 | 0 | 1 |
| 2005 | 1 | 0 |
| 2006 | 0 | 0 |
| 2007 | 0 | 0 |
| 2008 | 0 | 0 |
| 2009 | 0 | 0 |
| 2010 | 0 | 0 |
| 2011 | 0 | 1 |
| 2012 | 0 | 0 |
| 2013 | 0 | 0 |
| 2014 | 1 | 1 |
| 2015 | 0 | 0 |
| 2016 | 1 | 0 |
| 2017 | 0 | 1 |
| 2018 | 0 | 0 |
| 2019 | 1 | 0 |
| 2020 | 0 | 0 |
| 2021 | 0 | 0 |
| 2022 | 0 | 0 |
| 2023 | 0 | 0 |
| 2024 | 0 | 0 |
| 2025 | 0 | 0 |
| 2026 | 0 | 1 |
By publication year. 2026 runs to 8 Oct.
Recent patents
- Articulated mine door opening mechanism22 Jan 2019US 10,184,286 B2Jack Kennedy Metal Products & Buildings, Inc.
- Method of opening a mine door leaf17 May 2016US 9,341,061 B2Jack Kennedy Metal Products & Buildings, Inc.
- Articulated mine door opening mechanism12 Aug 2014US 8,800,204 B2Kennedy Metal Products & Buildings, Inc.
- Mine door system including an air pressure relief door18 Oct 2005US 6,955,594 B2
- Mine door installation22 Jul 2003US 6,594,954 B1Jack Kennedy Metal Products & Buildings, Inc.
- Ventilation System for Underground Environments29 Jan 2026US 2026/0028911 A1
- Articulated mine door opening mechanism11 May 2017US 2017/0130506 A1Jack Kennedy Metal Products & Buildings, Inc.
- Method of opening a mine door leaf23 Oct 2014US 2014/0311042 A1Kennedy Metal Products & Buildings, Inc.
- Articulated mine door opening mechanism25 Aug 2011US 2011/0203182 A1Kennedy Metal Products & Buildings, Inc.
- Mine door system including an air pressure relief door30 Dec 2004US 2004/0266329 A1
Most cited
By later US patents
- Mine door power drive system22US 6,425,820 B1Jack Kennedy Metal Products & Buildings, Inc. · 2002
- Mine door installation7US 6,594,954 B1Jack Kennedy Metal Products & Buildings, Inc. · 2003
- Mine door system including an air pressure relief door6US 6,955,594 B22005
- Balanced ventilation doors5US 6,361,430 B12002
- Articulated mine door opening mechanism3US 10,184,286 B2Jack Kennedy Metal Products & Buildings, Inc. · 2019