E21F 13/008
For mine roof support units for step-by-step movement
Official title: {for mine roof support units for step-by-step movement}
E21F13/008 (For mine roof support units for step-by-step movement) appears on 5 US grants and 2 published applications in this corpus.
Search patents in E21F- Granted patents
- 5
- Published applications
- 2
- Assignees
- 2
- Inventors
- 10
- Latest grant
- 31 Jul 2018
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1980 | 1 | 0 |
| 1981 | 0 | 0 |
| 1982 | 0 | 0 |
| 1983 | 0 | 0 |
| 1984 | 0 | 0 |
| 1985 | 0 | 0 |
| 1986 | 0 | 0 |
| 1987 | 0 | 0 |
| 1988 | 0 | 0 |
| 1989 | 0 | 0 |
| 1990 | 0 | 0 |
| 1991 | 2 | 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 | 1 | 1 |
| 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 | 1 |
| 2018 | 1 | 0 |
By publication year. Applications have been published since 2001.
Recent patents
- Method for removing hydraulic support for solid filling coal mining31 Jul 2018US 10,036,252 B2China University of Mining and Technology
- Method and apparatus for transporting materials in a mine5 Aug 2003US 6,602,040 B1Petitto Mine Equipment, Inc.
- Material handling platform for material transport vehicle31 Dec 1991US 5,076,749 APetitto Mine Equipment, Inc.
- Material handling platform for material transport vehicle26 Feb 1991US 4,995,783 APetitto Mine Equipment, Inc.
- Articulating mine car coupling15 Jul 1980US 4,212,365 A
Most cited
By later US patents
- Material handling platform for material transport vehicle4US 4,995,783 APetitto Mine Equipment, Inc. · 1991
- Articulating mine car coupling2US 4,212,365 A1980
- Material handling platform for material transport vehicle2US 5,076,749 APetitto Mine Equipment, Inc. · 1991
- Method and apparatus for transporting materials in a mine1US 6,602,040 B1Petitto Mine Equipment, Inc. · 2003