E21D 23/0052
Mine roof supports for step- by- step movement: with advancing shifting devices
Official title: {with advancing shifting devices connected therewith}
E21D23/0052 (Mine roof supports for step- by- step movement: with advancing shifting devices) appears on 5 US grants and 6 published applications in this corpus.
Search patents in E21D- Granted patents
- 5
- Published applications
- 6
- Assignees
- 5
- Inventors
- 12
- Latest grant
- 5 Sep 2023
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 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 | 1 |
| 2014 | 0 | 1 |
| 2015 | 0 | 0 |
| 2016 | 0 | 1 |
| 2017 | 2 | 1 |
| 2018 | 1 | 0 |
| 2019 | 0 | 0 |
| 2020 | 0 | 0 |
| 2021 | 0 | 1 |
| 2022 | 0 | 1 |
| 2023 | 1 | 0 |
By publication year. Applications have been published since 2001.
Recent patents
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- Mining system25 Oct 1983US 4,411,559 A
- Method and device for monitoring operation of a mining machine unit5 May 2022US 2022/0136390 A1Caterpillar SARL
- Construction method for continuous mining machine having device continuously providing provisional roof support2 Sep 2021US 2021/0270134 A1China University of Mining and Technology
- Advancing Ram Pin Retention Device1 Jun 2017US 2017/0152746 A1Joy MM Delaware, Inc.
- Advancing ram pin retention device11 Aug 2016US 2016/0230554 A1Joy MM Delaware, Inc.
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