E21C 27/34
Machine propelled along the working face by cable or chain
E21C27/34 (Machine propelled along the working face by cable or chain) appears on 51 US grants and 18 published applications in this corpus.
Search patents in E21C- Granted patents
- 51
- Published applications
- 18
- Assignees
- 20
- Inventors
- 60
- Latest grant
- 17 Dec 2019
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 1 | 0 |
| 1977 | 4 | 0 |
| 1978 | 2 | 0 |
| 1979 | 6 | 0 |
| 1980 | 2 | 0 |
| 1981 | 5 | 0 |
| 1982 | 1 | 0 |
| 1983 | 3 | 0 |
| 1984 | 2 | 0 |
| 1985 | 0 | 0 |
| 1986 | 0 | 0 |
| 1987 | 3 | 0 |
| 1988 | 1 | 0 |
| 1989 | 0 | 0 |
| 1990 | 1 | 0 |
| 1991 | 0 | 0 |
| 1992 | 1 | 0 |
| 1993 | 0 | 0 |
| 1994 | 0 | 0 |
| 1995 | 1 | 0 |
| 1996 | 0 | 0 |
| 1997 | 1 | 0 |
| 1998 | 0 | 0 |
| 1999 | 1 | 0 |
| 2000 | 0 | 0 |
| 2001 | 0 | 0 |
| 2002 | 0 | 0 |
| 2003 | 0 | 0 |
| 2004 | 0 | 1 |
| 2005 | 0 | 2 |
| 2006 | 1 | 0 |
| 2007 | 1 | 2 |
| 2008 | 3 | 0 |
| 2009 | 0 | 0 |
| 2010 | 0 | 4 |
| 2011 | 0 | 1 |
| 2012 | 1 | 2 |
| 2013 | 3 | 1 |
| 2014 | 3 | 1 |
| 2015 | 3 | 3 |
| 2016 | 0 | 0 |
| 2017 | 0 | 1 |
| 2018 | 0 | 0 |
| 2019 | 1 | 0 |
By publication year. Applications have been published since 2001.
Subgroups
Granted patents
Recent patents
- Plow guide assembly for plow guides17 Dec 2019US 10,508,540 B2Caterpillar Global Mining Europe GmbH
- Guide piece for an extraction or coal plough20 Oct 2015US 9,163,501 B2Caterpillar Global Mining Europe GmbH
- Plowing device15 Sep 2015US 9,133,710 B2Thiele GmbH & Co.KG
- Demountable pin and collet assembly and method to securely fasten a ranging arm to a longwall shearer using such assembly17 Mar 2015US 8,979,211 B2Solvay Chemicals, Inc.
- Mining plough for plough systems and plough system for inclined formation17 Jun 2014US 8,752,906 B2Caterpillar Global Mining Europe GmbH
- Plow guide assembly for plow guides12 Oct 2017US 2017/0292378 A1Caterpillar Global Mining Europe GmbH
- Extraction installation for mineral extraction1 Oct 2015US 2015/0275664 A1Caterpillar Global Mining Europe GmbH
- Guide piece for an extraction or coal plough17 Sep 2015US 2015/0260040 A1Caterpillar Global Mining Europe GmbH
- Mining plow26 Mar 2015US 2015/0084396 A1Caterpillar Global Mining Europe GmbH
- Planing device18 Dec 2014US 2014/0368021 A1Thiele GmbH & Co.KG
Most cited
By later US patents
- Continuously operating mining machines with plow and conveyor chains and method of operating same31US 5,647,640 ABochumer Eisenhutte Heintzmann GmbH & Co. KG · 1997
- Apparatus for mining a seam, in particular of coal10US 5,474,365 A1995
- Device for determining the cutting horizon of a mining extraction system, and pan element therefor10US 8,128,176 B2Bucyrus Europe GmbH · 2012
- Mineral mining installation with planer and jet carrier9US 4,243,268 AGewerkschaft Eisenhutte Westfalia · 1981
- Control of mineral mining machines9US 4,934,757 AGewerkschaft Eisenhutte Westfalia · 1990