E21C 41/00
Methods of underground or surface mining
Official title: Methods of underground or surface mining (E21C45/00 takes precedence); Layouts therefor (for peat E21C49/00)
E21C41/00 (Methods of underground or surface mining) appears on 766 US grants and 476 published applications in this corpus.
Search patents in E21C- Granted patents
- 766
- Published applications
- 476
- Assignees
- 358
- Inventors
- 1,708
- Latest grant
- 6 Oct 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 24 | 0 |
| 1977 | 36 | 0 |
| 1978 | 34 | 0 |
| 1979 | 45 | 0 |
| 1980 | 45 | 0 |
| 1981 | 42 | 0 |
| 1982 | 17 | 0 |
| 1983 | 32 | 0 |
| 1984 | 42 | 0 |
| 1985 | 13 | 0 |
| 1986 | 13 | 0 |
| 1987 | 2 | 0 |
| 1988 | 1 | 0 |
| 1989 | 4 | 0 |
| 1990 | 4 | 0 |
| 1991 | 3 | 0 |
| 1992 | 5 | 0 |
| 1993 | 7 | 0 |
| 1994 | 3 | 0 |
| 1995 | 7 | 0 |
| 1996 | 7 | 0 |
| 1997 | 3 | 0 |
| 1998 | 2 | 0 |
| 1999 | 5 | 0 |
| 2000 | 7 | 0 |
| 2001 | 5 | 1 |
| 2002 | 7 | 5 |
| 2003 | 5 | 8 |
| 2004 | 6 | 9 |
| 2005 | 9 | 6 |
| 2006 | 4 | 5 |
| 2007 | 2 | 12 |
| 2008 | 6 | 10 |
| 2009 | 7 | 8 |
| 2010 | 4 | 19 |
| 2011 | 12 | 19 |
| 2012 | 8 | 16 |
| 2013 | 15 | 20 |
| 2014 | 15 | 26 |
| 2015 | 18 | 23 |
| 2016 | 14 | 27 |
| 2017 | 14 | 19 |
| 2018 | 19 | 29 |
| 2019 | 27 | 25 |
| 2020 | 33 | 36 |
| 2021 | 22 | 34 |
| 2022 | 18 | 23 |
| 2023 | 25 | 31 |
| 2024 | 32 | 26 |
| 2025 | 24 | 24 |
| 2026 | 12 | 15 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Blasthole stemming based on formaldehyde resins, system and charging method6 Oct 2026US 12,754,001 B2Oxiquim S.A.
- Optimizing use of battery electric mine vehicles based on simulations22 Sep 2026US 12,743,909 B2Modular Mining Systems, Inc.
- Vehicle barrier system and method of construction thereof11 Aug 2026US 12,703,951 B2
- Flexible electrode tube for electrified rare earth mining and application method therefor21 Jul 2026US 12,687,112 B2Guangzhou Institute of Geochemistry, Chinese Academy of Sciences
- Permeability enhancement device for coal-seam gas drainage30 Jun 2026US 12,669,055 B2Henan Polytechnic University
- Steep pit wall mining1 Oct 2026US 2026/0298083 A1
- Safe mining method for water-rich gently inclined coal seam3 Sep 2026US 2026/0258725 A1China University of Mining and Technology
- Wellbore controllable chamber-forming granular-flow mining system6 Aug 2026US 2026/0226817 A1Blueland Technology Limited
- Underground mining system and method30 Jul 2026US 2026/0218612 A1
- Post-mining water-resisting layer reconstruction method and related device23 Jul 2026US 2026/0210248 A1China University of Mining and Technology, Beijing
Most cited
By later US patents
- Recovery of hydrocarbons by in situ thermal extraction365US 3,954,140 A1976
- Transient response process for detecting in situ retorting conditions273US 4,457,374 AThe Standard Oil Company · 1984
- Treatment of underground beds255US 4,442,896 A1984
- Modified in situ retorting of oil shale224US 4,401,163 AThe Standard Oil Company · 1983
- Reduction of shale oil pour point215US 4,437,519 AOccidental Oil Shale, Inc. · 1984