E21C 25/56
Slitting by cutter cables or cutter chains or by tools drawn along
Official title: Slitting by cutter cables or cutter chains or by tools drawn along the working face by cables or the like, in each case guided parallel to the face, e.g. by a conveyor or by a guide parallel to a conveyor (pressing the conveyor equipped with tools toward the working face E21C35/14)
E21C25/56 (Slitting by cutter cables or cutter chains or by tools drawn along) appears on 10 US grants and 7 published applications in this corpus.
Search patents in E21C- Granted patents
- 10
- Published applications
- 7
- Assignees
- 6
- Inventors
- 15
- Latest grant
- 19 Dec 2023
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1989 | 1 | 0 |
| 1990 | 0 | 0 |
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| 1992 | 0 | 0 |
| 1993 | 1 | 0 |
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| 2005 | 0 | 0 |
| 2006 | 1 | 0 |
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| 2009 | 0 | 0 |
| 2010 | 0 | 0 |
| 2011 | 0 | 1 |
| 2012 | 0 | 0 |
| 2013 | 1 | 0 |
| 2014 | 0 | 0 |
| 2015 | 2 | 3 |
| 2016 | 0 | 1 |
| 2017 | 0 | 0 |
| 2018 | 0 | 0 |
| 2019 | 0 | 1 |
| 2020 | 0 | 0 |
| 2021 | 1 | 1 |
| 2022 | 1 | 0 |
| 2023 | 1 | 0 |
By publication year. Applications have been published since 2001.
Recent patents
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- Wire saw excavation apparatus capable of changing cutting line in accordance with cutting section and tunnel excavation method using same18 Oct 2022US 11,472,063 B2
- Mining pin retention system20 Apr 2021US 10,982,540 B2ITR America, LLC
- Method for wire saw excavation29 Sep 2015US 9,144,921 B2King Fahd University of Petroleum and Minerals
- Method for wire saw excavation30 Jun 2015US 9,068,454 B1King Fahd University of Petroleum and Minerals
- Wire saw excavation apparatus capable of changing cutting line in accordance with cutting section and tunnel excavation method using same11 Nov 2021US 2021/0348510 A1
- Mining pin retention system28 Feb 2019US 2019/0063217 A1ITR America, LLC
- Mining pin retention system15 Dec 2016US 2016/0362978 A1ITR America, LLC
- 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
Most cited
By later US patents
- Apparatus for mining a seam, in particular of coal10US 5,474,365 A1995
- Method for controlling longwall operations using boundary layer recognition5US 8,608,248 B2RAG Aktiengesselschaft · 2013
- Mining pin retention system4US 10,982,540 B2ITR America, LLC · 2021
- Mining and conveying apparatus3US 4,883,322 ABochumer Eisenhutte Heintzmann GmbH & Co. KG · 1989
- System for cutting and conveying coal and the like1US 5,181,766 ABochumer Eisenhutte Heintzmann GmbH & Co. KG · 1993