E21D 23/0409
Aligning or guiding means for the supports or for the constitutive parts
Official title: {Aligning or guiding means for the supports or for the constitutive parts of the supports}
E21D23/0409 (Aligning or guiding means for the supports or for the constitutive parts) appears on 18 US grants and 1 published applications in this corpus.
Search patents in E21D- Granted patents
- 18
- Published applications
- 1
- Assignees
- 13
- Inventors
- 33
- Latest grant
- 9 Feb 2021
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 1 | 0 |
| 1977 | 2 | 0 |
| 1978 | 2 | 0 |
| 1979 | 0 | 0 |
| 1980 | 2 | 0 |
| 1981 | 1 | 0 |
| 1982 | 4 | 0 |
| 1983 | 3 | 0 |
| 1984 | 1 | 0 |
| 1985 | 0 | 0 |
| 1986 | 1 | 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
- Roof support connector9 Feb 2021US 10,914,170 B2Joy Global Underground Mining LLC
- Levelling ram for roof-shield mine support systems6 May 1986US 4,586,851 AKloeckner-Becorit GmbH
- Mine roof support21 Feb 1984US 4,432,673 ADowty Mining Equipment Limited
- Advance mechanism for a mine roof support assembly28 Jun 1983US 4,390,308 AGewerkschaft Eisenhutte Westfalia
- Mine-roof support19 Apr 1983US 4,380,410 AHermann Hemscheidt Maschinenfabrik GmbH & Co.
Most cited
By later US patents
- Mine roof support14US 4,010,618 ADowty Mining Equipment Limited · 1977
- Mine roof support9US 4,309,130 ABochumer Eisenhutte Heintzmann GmbH & Co. KG · 1982
- Advance mechanism for a mine roof support unit7US 4,379,661 AGewerkschaft Eisenhutte Westfalia · 1983
- Mine roof support assemblies6US 4,073,151 AGewerkschaft Eisenhutte Westfalia · 1978
- Pit prop assembly5US 4,008,578 ABochumer Eisenhutte Heintzmann GmbH & Co. KG · 1977