E21C 25/54
Slitting by unguided cutter cables or cutter chains, or by unguided tools
Official title: Slitting by unguided cutter cables or cutter chains, or by unguided tools drawn along the working face by cables or the like (dislodging by planing means E21C27/32; propulsion by haulage cables E21C29/14)
E21C25/54 (Slitting by unguided cutter cables or cutter chains, or by unguided tools) appears on 6 US grants and 6 published applications in this corpus.
Search patents in E21C- Granted patents
- 6
- Published applications
- 6
- Assignees
- 5
- Inventors
- 15
- Latest grant
- 29 Sep 2015
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1980 | 1 | 0 |
| 1981 | 0 | 0 |
| 1982 | 0 | 0 |
| 1983 | 0 | 0 |
| 1984 | 0 | 0 |
| 1985 | 0 | 0 |
| 1986 | 0 | 0 |
| 1987 | 0 | 0 |
| 1988 | 0 | 0 |
| 1989 | 0 | 0 |
| 1990 | 1 | 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 | 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 | 0 |
| 2012 | 0 | 0 |
| 2013 | 0 | 0 |
| 2014 | 1 | 0 |
| 2015 | 2 | 3 |
| 2016 | 0 | 0 |
| 2017 | 0 | 0 |
| 2018 | 0 | 0 |
| 2019 | 0 | 1 |
| 2020 | 0 | 1 |
By publication year. Applications have been published since 2001.
Recent patents
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- Double slot wire sawing apparatus and method5 Dec 1995US 5,472,262 A
- Shaft excavation method21 Aug 1990US 4,950,034 ATrigon Geoducts Limited
- Support Pillar Mining Method30 Apr 2020US 2020/0131903 A1Perleen Cc
- Bottom-side separation of an object to be cut out of stone21 Mar 2019US 2019/0085689 A1Heindl Energy GmbH
- Excavating deposits from an underground formation layer29 Oct 2015US 2015/0308267 A1
- Method for wire saw excavation25 Jun 2015US 2015/0174789 A1King Fahd University of Petroleum and Minerals
- Method for wire saw excavation18 Jun 2015US 2015/0167460 A1King Fahd University of Petroleum and Minerals
Most cited
By later US patents