E21D 15/22
With member, pin, cross- piece, or the like, ruptured, sheared through, or
Official title: with member, pin, cross- piece, or the like, ruptured, sheared through, or permanently deformed upon excessive pressure
E21D15/22 (With member, pin, cross- piece, or the like, ruptured, sheared through, or) appears on 7 US grants and 2 published applications in this corpus.
Search patents in E21D- Granted patents
- 7
- Published applications
- 2
- Assignees
- 4
- Inventors
- 10
- Latest grant
- 17 Mar 2009
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 1 | 0 |
| 1977 | 0 | 0 |
| 1978 | 0 | 0 |
| 1979 | 0 | 0 |
| 1980 | 0 | 0 |
| 1981 | 1 | 0 |
| 1982 | 0 | 0 |
| 1983 | 1 | 0 |
| 1984 | 0 | 0 |
| 1985 | 1 | 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 | 1 | 0 |
| 1996 | 0 | 0 |
| 1997 | 0 | 0 |
| 1998 | 0 | 0 |
| 1999 | 0 | 0 |
| 2000 | 0 | 0 |
| 2001 | 0 | 0 |
| 2002 | 0 | 0 |
| 2003 | 1 | 1 |
| 2004 | 0 | 0 |
| 2005 | 0 | 0 |
| 2006 | 0 | 1 |
| 2007 | 0 | 0 |
| 2008 | 0 | 0 |
| 2009 | 1 | 0 |
By publication year. Applications have been published since 2001.
Recent patents
- Yieldable prop for roof and ground control17 Mar 2009US 7,503,731 B2
- Yielding column2 Dec 2003US 6,655,877 B2
- Yieldable roof support system28 Mar 1995US 5,400,994 ADyckerhoff & Widmann AG of Munich
- Yieldable connection24 Dec 1985US 4,560,305 A
- Mine roadway support stilt10 May 1983US 4,382,721 AHolywell Engineering Limited
Most cited
By later US patents
- Yieldable roof support system26US 5,400,994 ADyckerhoff & Widmann AG of Munich · 1995
- Stilts for use in mine workings10US 3,994,467 AGKN Sankey Limited · 1976
- Mine roadway support stilt9US 4,382,721 AHolywell Engineering Limited · 1983
- Yielding column9US 6,655,877 B22003
- Yieldable connection6US 4,560,305 A1985