E21C 47/02
Machines for obtaining or the removal of materials in open-pit mines: for
Official title: for coal, brown coal, or the like (dredgers or soil-shifting machines in general E02F)
E21C47/02 (Machines for obtaining or the removal of materials in open-pit mines: for) appears on 24 US grants and 19 published applications in this corpus.
Search patents in E21C- Granted patents
- 24
- Published applications
- 19
- Assignees
- 20
- Inventors
- 64
- Latest grant
- 5 Jul 2022
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1980 | 1 | 0 |
| 1981 | 1 | 0 |
| 1982 | 0 | 0 |
| 1983 | 0 | 0 |
| 1984 | 4 | 0 |
| 1985 | 0 | 0 |
| 1986 | 1 | 0 |
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| 1995 | 2 | 0 |
| 1996 | 0 | 0 |
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| 1999 | 1 | 0 |
| 2000 | 0 | 0 |
| 2001 | 0 | 0 |
| 2002 | 0 | 0 |
| 2003 | 0 | 0 |
| 2004 | 0 | 0 |
| 2005 | 0 | 0 |
| 2006 | 1 | 0 |
| 2007 | 0 | 1 |
| 2008 | 0 | 1 |
| 2009 | 0 | 0 |
| 2010 | 1 | 3 |
| 2011 | 0 | 1 |
| 2012 | 0 | 0 |
| 2013 | 3 | 2 |
| 2014 | 0 | 1 |
| 2015 | 1 | 1 |
| 2016 | 0 | 0 |
| 2017 | 0 | 1 |
| 2018 | 1 | 2 |
| 2019 | 1 | 0 |
| 2020 | 2 | 1 |
| 2021 | 1 | 1 |
| 2022 | 1 | 0 |
| 2023 | 0 | 0 |
| 2024 | 0 | 2 |
| 2025 | 0 | 0 |
| 2026 | 0 | 2 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Method for radially mining open-pit end slope pressed coal5 Jul 2022US 11,377,952 B2China University of Mining and Technology
- Feeder23 Mar 2021US 10,954,786 B2MMD Design & Consultancy Limited
- Method of moving material23 Jun 2020US 10,689,981 B2Opti-Minez Pty Ltd
- Apparatus and methods for cemented multi-zone completions17 Mar 2020US 10,590,767 B2Weatherford Technology Holdings, LLC
- Excavation utilizing dual hopper system19 Mar 2019US 10,233,616 B2Caterpillar Inc.
- Method for operating automatic mining of mining electric shovel based on auxiliary vision20 Aug 2026US 2026/0243054 A1China University of Mining and Technology
- Method for controlling automatic operation of mining electric shovel considering sudden load variations during excavations2 Jul 2026US 2026/0185445 A1China University of Mining and Technology
- Feeder2 May 2024US 2024/0140728 A1Mmd Group Limited
- Feeder2 May 2024US 2024/0140737 A1Mmd Group Limited
- Method for radially mining open-pit end slope pressed coal19 Aug 2021US 2021/0254465 A1China University of Mining and Technology
Most cited
By later US patents
- Method of operating a bucket wheel excavator28US 5,857,274 AKrupp Fordertechnik GmbH · 1999
- Dragline bucket rigging and control apparatus17US 7,152,349 B1CMTE Development Limited · 2006
- Cross-pit conveyor16US 4,489,818 AMannesmann Aktiengesellschaft · 1984
- Mobile connecting belt bridge for open pit mining12US 5,404,988 AKrupp Fordertechnik GmbH · 1995
- Surface mining method9US 4,290,651 ADresser Industries, Inc. · 1981