E21D 23/0418
Positioning devices and stabilizing means for the props
Official title: {Positioning devices and stabilizing means for the props}
E21D23/0418 (Positioning devices and stabilizing means for the props) appears on 9 US grants and 3 published applications in this corpus.
Search patents in E21D- Granted patents
- 9
- Published applications
- 3
- Assignees
- 9
- Inventors
- 25
- Latest grant
- 26 Jul 2022
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 2 | 0 |
| 1977 | 0 | 0 |
| 1978 | 2 | 0 |
| 1979 | 0 | 0 |
| 1980 | 0 | 0 |
| 1981 | 1 | 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 | 0 | 0 |
| 1992 | 0 | 0 |
| 1993 | 0 | 0 |
| 1994 | 0 | 0 |
| 1995 | 0 | 0 |
| 1996 | 0 | 0 |
| 1997 | 1 | 0 |
| 1998 | 0 | 0 |
| 1999 | 0 | 0 |
| 2000 | 0 | 0 |
| 2001 | 0 | 0 |
| 2002 | 0 | 0 |
| 2003 | 0 | 0 |
| 2004 | 0 | 1 |
| 2005 | 0 | 0 |
| 2006 | 0 | 0 |
| 2007 | 1 | 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 | 1 | 2 |
| 2021 | 0 | 0 |
| 2022 | 1 | 0 |
By publication year. Applications have been published since 2001.
Recent patents
- Hydraulic shield support system and pressure intensifier26 Jul 2022US 11,396,894 B2Caterpillar Global Mining Europe GmbH
- Apparatus for protecting roof tray when gob-side entry retaining end support migrates3 Nov 2020US 10,822,949 B1China Mining & Civil New Material Science and Technology Ltd.
- Hydraulic shield support3 Jul 2007US 7,237,983 B2DBT GmbH
- Sliding stabilizer6 May 1997US 5,626,441 A
- Mine roof supporting system23 Jun 1981US 4,274,764 A
Most cited
By later US patents
- Mine roof supporting system8US 4,274,764 A1981
- Mine roof support4US 3,996,753 ABecorit Grubenausbau GmbH · 1976
- Prop-and-shoe assemblies of self-advancing mine roof-supports3US 3,985,328 AHermann Hemscheidt Maschinenfabrik GmbH & Co. · 1976
- Self-advancing mine roof supports3US 4,102,140 AGullick Dobson Limited · 1978
- Hydraulic shield support3US 7,237,983 B2DBT GmbH · 2007