E21D 23/063
Retractable cantilever extensions therefor
Official title: {Retractable cantilever extensions therefor}
E21D23/063 (Retractable cantilever extensions therefor) appears on 16 US grants and 2 published applications in this corpus.
Search patents in E21D- Granted patents
- 16
- Published applications
- 2
- Assignees
- 7
- Inventors
- 26
- Latest grant
- 4 May 2021
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1977 | 1 | 0 |
| 1978 | 2 | 0 |
| 1979 | 0 | 0 |
| 1980 | 0 | 0 |
| 1981 | 1 | 0 |
| 1982 | 1 | 0 |
| 1983 | 1 | 0 |
| 1984 | 3 | 0 |
| 1985 | 1 | 0 |
| 1986 | 1 | 0 |
| 1987 | 0 | 0 |
| 1988 | 0 | 0 |
| 1989 | 1 | 0 |
| 1990 | 1 | 0 |
| 1991 | 1 | 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 | 1 |
| 2020 | 1 | 1 |
| 2021 | 1 | 0 |
By publication year. Applications have been published since 2001.
Recent patents
- Mining rock deflector apparatus and method4 May 2021US 10,995,617 B2Swanson Industries, Inc.
- Mining rock deflector apparatus and method20 Oct 2020US 10,808,533 B2Swanson Industries, Inc.
- Shaking control unit for a hydraulic cylinder19 Mar 1991US 5,000,622 ABochumer Eisenhutte Heintzmann GmbH & Co. KG
- Shaking control unit for a hydraulic cylinder13 Mar 1990US 4,907,918 ABochumer Eisenhutte Heintzmann GmbH & Co. KG
- Method of separating the upper coal in seams17 Jan 1989US 4,798,417 ABochumer Eisenhutte Heintzmann GmbH & Co. HG
Most cited
By later US patents
- Mineral mining installation9US 4,427,321 AGewerkschaft Eisenhutte Westfalia · 1984
- Method of separating the upper coal in seams7US 4,798,417 ABochumer Eisenhutte Heintzmann GmbH & Co. HG · 1989
- Roof support suitable for use in mines6US 4,411,558 ADowty Mining Equipment Limited · 1983
- Mine roof support4US 4,309,131 ABochumer Eisenhutte Heintzmann GmbH & Co. KG · 1982
- Mine roof supports3US 4,124,984 AHuwood Limited · 1978