E21D 23/0039
And supported by a strut or by a row of struts parallel
Official title: {and supported by a strut or by a row of struts parallel to the working face}
E21D23/0039 (And supported by a strut or by a row of struts parallel) appears on 21 US grants and 3 published applications in this corpus.
Search patents in E21D- Granted patents
- 21
- Published applications
- 3
- Assignees
- 20
- Inventors
- 45
- Latest grant
- 5 Jan 2016
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 2 | 0 |
| 1977 | 3 | 0 |
| 1978 | 1 | 0 |
| 1979 | 0 | 0 |
| 1980 | 3 | 0 |
| 1981 | 2 | 0 |
| 1982 | 0 | 0 |
| 1983 | 2 | 0 |
| 1984 | 0 | 0 |
| 1985 | 2 | 0 |
| 1986 | 1 | 0 |
| 1987 | 0 | 0 |
| 1988 | 1 | 0 |
| 1989 | 2 | 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 | 1 |
| 2012 | 0 | 1 |
| 2013 | 1 | 0 |
| 2014 | 0 | 1 |
| 2015 | 0 | 0 |
| 2016 | 1 | 0 |
By publication year. Applications have been published since 2001.
Recent patents
- Longwall equipment with a hydrostatic tube balance thereon for determining the height position of individual elements of the longwall equipment5 Jan 2016US 9,227,792 B2RAG Aktiengessellschaft
- Method for automatically producing a defined face opening in plow operations in coal mining19 Feb 2013US 8,376,467 B2RAG Aktiengesellschaft
- Roof supports28 Mar 1989US 4,815,898 AGewerkschaft Eisenhutte Westfalia
- Mine roof supports10 Jan 1989US 4,797,023 AGullick Dobson Limited
- Mine roof supports20 Dec 1988US 4,792,261 AGullick Dobson Limited
- Longwall Equipment with a Hydrostatic Tube Balance Thereon for Determining the Height Position of Individual Elements of the Longwall Equipment10 Apr 2014US 2014/0097067 A1RAG Aktiengessellschaft
- Advancing assembly and powered shield support herewith19 Jul 2012US 2012/0180467 A1Bucyrus Europe GmbH
- Method for Automatically Producing a Defined Face Opening in Plow Operations in Coal Mining13 Jan 2011US 2011/0006584 A1RAG Aktiengesellshaft
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
- Shield timbering frame for timbering mines10US 4,236,850 AThyssen Industrie AG · 1980
- Mine roof support6US 4,027,489 ADowty Mining Equipment Limited · 1977
- Mining equipment, mainly for extraction of heavy beds6US 4,386,878 AKozponti Banyaszati Fejlesztesi Intezet · 1983
- Shield-type support frame5US 4,557,635 AKlockner-Becorit GmbH · 1985