E21D 15/04
With wooden prop parts joined by double conical connectors
Official title: with wooden prop parts joined by double conical connectors
E21D15/04 (With wooden prop parts joined by double conical connectors) appears on 3 US grants and 4 published applications in this corpus.
Search patents in E21D- Granted patents
- 3
- Published applications
- 4
- Assignees
- 4
- Inventors
- 6
- Latest grant
- 5 Mar 2002
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1995 | 1 | 0 |
| 1996 | 0 | 0 |
| 1997 | 0 | 0 |
| 1998 | 1 | 0 |
| 1999 | 0 | 0 |
| 2000 | 0 | 0 |
| 2001 | 0 | 0 |
| 2002 | 1 | 0 |
| 2003 | 0 | 1 |
| 2004 | 0 | 0 |
| 2005 | 0 | 0 |
| 2006 | 0 | 1 |
| 2007 | 0 | 0 |
| 2008 | 0 | 0 |
| 2009 | 0 | 0 |
| 2010 | 0 | 0 |
| 2011 | 0 | 1 |
| 2012 | 0 | 0 |
| 2013 | 0 | 0 |
| 2014 | 0 | 1 |
By publication year. Applications have been published since 2001.
Recent patents
- Mine Roof Support Member and Method for Constructing Improved Mine Roof Support Columns15 May 2014US 2014/0133923 A1
- Lite mine roof support crib and method7 Jul 2011US 2011/0164929 A1
- Lite mine roof support crib and method5 Jan 2006US 2006/0002770 A1
- Lite mine roof support crib and method10 Apr 2003US 2003/0068204 A1Strata Products (USA), Inc.
Most cited
By later US patents