E21F 1/145
Air locks
Official title: {Air locks (air doors E21F1/10; dam doors E21F17/12)}
E21F1/145 (Air locks) appears on 6 US grants and 6 published applications in this corpus.
Search patents in E21F- Granted patents
- 6
- Published applications
- 6
- Assignees
- 5
- Inventors
- 10
- Latest grant
- 24 Feb 2015
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1985 | 1 | 0 |
| 1986 | 0 | 0 |
| 1987 | 0 | 0 |
| 1988 | 0 | 0 |
| 1989 | 0 | 0 |
| 1990 | 0 | 0 |
| 1991 | 0 | 0 |
| 1992 | 0 | 0 |
| 1993 | 0 | 0 |
| 1994 | 0 | 0 |
| 1995 | 1 | 0 |
| 1996 | 0 | 0 |
| 1997 | 0 | 0 |
| 1998 | 0 | 0 |
| 1999 | 0 | 0 |
| 2000 | 0 | 0 |
| 2001 | 0 | 0 |
| 2002 | 1 | 1 |
| 2003 | 0 | 1 |
| 2004 | 2 | 0 |
| 2005 | 0 | 0 |
| 2006 | 0 | 0 |
| 2007 | 0 | 0 |
| 2008 | 0 | 0 |
| 2009 | 0 | 1 |
| 2010 | 0 | 0 |
| 2011 | 0 | 0 |
| 2012 | 0 | 0 |
| 2013 | 0 | 0 |
| 2014 | 0 | 3 |
| 2015 | 1 | 0 |
By publication year. Applications have been published since 2001.
Recent patents
- Box check for conveyor belt and method of installation24 Feb 2015US 8,960,419 B2Kennedy Metal Products & Buildings, Inc.
- Method of supporting mine walls and installing a mine stopping6 Apr 2004US 6,715,961 B2Jack Kennedy Metal Products & Buildings, Inc.
- Multiple tier stopping and method of constructing stopping27 Jan 2004US 6,682,263 B2Jack Kennedy Metal Products & Buildings, Inc.
- Mine stopping30 Apr 2002US 6,379,084 B1Jack Kennedy Metal Products & Buildings, Inc.
- Pumpable mine seal28 Mar 1995US 5,401,120 A
- Change Over Station and Method27 Nov 2014US 2014/0349562 A1Strata Products Worldwide, LLC
- Mine airlock system and method18 Sep 2014US 2014/0273791 A1Krist Door Service, Inc.
- Box check for conveyor belt and method of installation4 Sep 2014US 2014/0246292 A1Kennedy Metal Products & Buildings, Inc.
- Tunnel cover for a tunnel for controlled ventilation of gas12 Feb 2009US 2009/0042504 A1
- Multiple tier stopping and method of constructing stopping31 Jul 2003US 2003/0143942 A1Jack Kennedy Metal Products & Buildings, Inc.
Most cited
By later US patents
- Mine stopping21US 4,547,094 A1985
- Pumpable mine seal15US 5,401,120 A1995
- Mine stopping15US 6,379,084 B1Jack Kennedy Metal Products & Buildings, Inc. · 2002
- Box check for conveyor belt and method of installation8US 8,960,419 B2Kennedy Metal Products & Buildings, Inc. · 2015
- Multiple tier stopping and method of constructing stopping7US 6,682,263 B2Jack Kennedy Metal Products & Buildings, Inc. · 2004