E21C 41/16
Methods of underground mining
Official title: Methods of underground mining (winning machines therefor E21C25/00 - E21C39/00); Layouts therefor
E21C41/16 (Methods of underground mining) appears on 566 US grants and 295 published applications in this corpus.
Search patents in E21C- Granted patents
- 566
- Published applications
- 295
- Assignees
- 259
- Inventors
- 1,257
- Latest grant
- 21 Jul 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 19 | 0 |
| 1977 | 29 | 0 |
| 1978 | 32 | 0 |
| 1979 | 34 | 0 |
| 1980 | 40 | 0 |
| 1981 | 36 | 0 |
| 1982 | 15 | 0 |
| 1983 | 29 | 0 |
| 1984 | 36 | 0 |
| 1985 | 10 | 0 |
| 1986 | 8 | 0 |
| 1987 | 2 | 0 |
| 1988 | 1 | 0 |
| 1989 | 4 | 0 |
| 1990 | 2 | 0 |
| 1991 | 1 | 0 |
| 1992 | 2 | 0 |
| 1993 | 6 | 0 |
| 1994 | 3 | 0 |
| 1995 | 3 | 0 |
| 1996 | 7 | 0 |
| 1997 | 1 | 0 |
| 1998 | 2 | 0 |
| 1999 | 3 | 0 |
| 2000 | 6 | 0 |
| 2001 | 2 | 1 |
| 2002 | 6 | 5 |
| 2003 | 3 | 7 |
| 2004 | 6 | 6 |
| 2005 | 8 | 4 |
| 2006 | 2 | 3 |
| 2007 | 2 | 6 |
| 2008 | 5 | 4 |
| 2009 | 3 | 3 |
| 2010 | 2 | 9 |
| 2011 | 4 | 8 |
| 2012 | 4 | 3 |
| 2013 | 7 | 10 |
| 2014 | 7 | 15 |
| 2015 | 8 | 14 |
| 2016 | 9 | 22 |
| 2017 | 9 | 8 |
| 2018 | 12 | 20 |
| 2019 | 16 | 10 |
| 2020 | 18 | 26 |
| 2021 | 16 | 26 |
| 2022 | 15 | 17 |
| 2023 | 18 | 24 |
| 2024 | 26 | 15 |
| 2025 | 19 | 17 |
| 2026 | 8 | 12 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- 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
- High-concentration filling slurry of coal gangue and preparation method thereof9 Jun 2026US 12,649,887 B1Taiyuan University of Science and Technology
- Method and device for horizontal bore mining5 May 2026US 12,618,308 B2Iluka Resources Limited
- Static crushing directional anchor withdrawal method at end of large-mining-height working face21 Apr 2026US 12,607,121 B2Huating Coal Group Co., Ltd.
- 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
- Methods, devices, and storage medium for synchronous treatment of water hazard and subsidence25 Jun 2026US 2026/0176970 A1China University of Mining and Technology, Beijing
- In situ leach mining using electrical reservoir stimulation18 Jun 2026US 2026/0168369 A1Eden GeoPower, Inc.
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
- 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
- In situ retorting of oil shale200US 3,950,029 AMobil Oil Corporation · 1976