E21D 23/0043
And supported by two or more rows of struts parallel to the
Official title: {and supported by two or more rows of struts parallel to the working face}
E21D23/0043 (And supported by two or more rows of struts parallel to the) appears on 26 US grants and 6 published applications in this corpus.
Search patents in E21D- Granted patents
- 26
- Published applications
- 6
- Assignees
- 15
- Inventors
- 26
- Latest grant
- 4 May 2021
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 1 | 0 |
| 1977 | 1 | 0 |
| 1978 | 5 | 0 |
| 1979 | 0 | 0 |
| 1980 | 1 | 0 |
| 1981 | 2 | 0 |
| 1982 | 0 | 0 |
| 1983 | 1 | 0 |
| 1984 | 4 | 0 |
| 1985 | 2 | 0 |
| 1986 | 1 | 0 |
| 1987 | 0 | 0 |
| 1988 | 2 | 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 | 1 |
| 2011 | 0 | 2 |
| 2012 | 0 | 0 |
| 2013 | 3 | 0 |
| 2014 | 0 | 1 |
| 2015 | 0 | 0 |
| 2016 | 0 | 0 |
| 2017 | 1 | 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.
- Longwall mining roof supports6 Jun 2017US 9,670,777 B2Joy MM Delaware, Inc.
- Longwall mining roof supports26 Nov 2013US 8,590,982 B2Joy MM Delaware, Inc.
- Method for automatically creating a defined face opening in longwall mining operations29 Oct 2013US 8,567,871 B2RAG Aktiegesellschaft
- Mining rock deflector apparatus and method24 Dec 2020US 2020/0400020 A1Swanson Industries, Inc.
- Mining rock deflector apparatus and method21 Nov 2019US 2019/0353035 A1Swanson Industries, Inc.
- Longwall mining roof supports20 Mar 2014US 2014/0077580 A1Joy MM Delaware, Inc.
- Method for Automatically Producing a Defined Face Opening in Plow Operations in Coal Mining13 Jan 2011US 2011/0006584 A1RAG Aktiengesellshaft
- Longwall mining roof supports13 Jan 2011US 2011/0006586 A1Joy MM Delaware, Inc.
Most cited
By later US patents
- Method for automatically producing a defined face opening in plow operations in coal mining13US 8,376,467 B2RAG Aktiengesellschaft · 2013
- Mineral mining installation9US 4,427,321 AGewerkschaft Eisenhutte Westfalia · 1984
- Method for automatically creating a defined face opening in longwall mining operations8US 8,567,871 B2RAG Aktiegesellschaft · 2013
- Mine roof support6US 4,037,419 ADowty Mining Equipment Limited · 1977
- Roof support suitable for use in mines6US 4,411,558 ADowty Mining Equipment Limited · 1983