E21D 23/0082
Mine roof supports for step- by- step movement: specially adapted for vertical
Official title: {specially adapted for vertical or steep gradient seams}
E21D23/0082 (Mine roof supports for step- by- step movement: specially adapted for vertical) appears on 5 US grants and 1 published applications in this corpus.
Search patents in E21D- Granted patents
- 5
- Published applications
- 1
- Assignees
- 4
- Inventors
- 13
- Latest grant
- 27 Apr 2021
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1978 | 1 | 0 |
| 1979 | 0 | 0 |
| 1980 | 0 | 0 |
| 1981 | 0 | 0 |
| 1982 | 2 | 0 |
| 1983 | 1 | 0 |
| 1984 | 0 | 0 |
| 1985 | 0 | 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 | 0 | 0 |
| 1996 | 0 | 0 |
| 1997 | 0 | 0 |
| 1998 | 0 | 0 |
| 1999 | 0 | 0 |
| 2000 | 0 | 0 |
| 2001 | 0 | 0 |
| 2002 | 0 | 0 |
| 2003 | 0 | 0 |
| 2004 | 0 | 0 |
| 2005 | 0 | 0 |
| 2006 | 0 | 0 |
| 2007 | 0 | 0 |
| 2008 | 0 | 0 |
| 2009 | 0 | 0 |
| 2010 | 0 | 0 |
| 2011 | 0 | 0 |
| 2012 | 0 | 0 |
| 2013 | 0 | 0 |
| 2014 | 0 | 0 |
| 2015 | 0 | 0 |
| 2016 | 0 | 0 |
| 2017 | 0 | 0 |
| 2018 | 0 | 0 |
| 2019 | 0 | 0 |
| 2020 | 0 | 1 |
| 2021 | 1 | 0 |
By publication year. Applications have been published since 2001.
Recent patents
- Multi-section non-pillar staggered protected roadway for deep inclined thick coal seam and method for coal pillar filling between sections27 Apr 2021US 10,989,051 B2
- Mineral mining installation5 Jul 1983US 4,391,469 AGewerkschaft Eisenhutte Westfalia
- Roof support for a mine gallery which extends at a relatively large angle inclined to the horizontal5 Oct 1982US 4,352,602 ABochumer Eisenhuette Heintzmann GmbH & Co.
- Apparatus for supporting a mine roof support assembly13 Apr 1982US 4,324,510 AGewerkschaft Eisenhutte Westfalia
- Shield-type support assemblies for mine workings28 Feb 1978US 4,075,857 AGewerkschaft Eisenhutte Westfalia
Most cited
By later US patents
- Mineral mining installation9US 4,391,469 AGewerkschaft Eisenhutte Westfalia · 1983
- Roof support for a mine gallery which extends at a relatively large angle inclined to the horizontal3US 4,352,602 ABochumer Eisenhuette Heintzmann GmbH & Co. · 1982
- Shield-type support assemblies for mine workings2US 4,075,857 AGewerkschaft Eisenhutte Westfalia · 1978
- Multi-section non-pillar staggered protected roadway for deep inclined thick coal seam and method for coal pillar filling between sections1US 10,989,051 B22021