E21C
Mining or quarrying
E21C (Mining or quarrying) appears on 3,628 US grants and 2,329 published applications in this corpus.
Search patents in E21C- Granted patents
- 3,628
- Published applications
- 2,329
- Assignees
- 1,193
- Inventors
- 5,481
- Latest grant
- 6 Oct 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 96 | 0 |
| 1977 | 110 | 0 |
| 1978 | 122 | 0 |
| 1979 | 98 | 0 |
| 1980 | 131 | 0 |
| 1981 | 138 | 0 |
| 1982 | 69 | 0 |
| 1983 | 84 | 0 |
| 1984 | 111 | 0 |
| 1985 | 67 | 0 |
| 1986 | 64 | 0 |
| 1987 | 77 | 0 |
| 1988 | 50 | 0 |
| 1989 | 65 | 0 |
| 1990 | 49 | 0 |
| 1991 | 36 | 0 |
| 1992 | 59 | 0 |
| 1993 | 38 | 0 |
| 1994 | 31 | 0 |
| 1995 | 33 | 0 |
| 1996 | 36 | 0 |
| 1997 | 42 | 0 |
| 1998 | 39 | 0 |
| 1999 | 29 | 0 |
| 2000 | 35 | 0 |
| 2001 | 49 | 6 |
| 2002 | 45 | 37 |
| 2003 | 30 | 42 |
| 2004 | 31 | 44 |
| 2005 | 35 | 46 |
| 2006 | 28 | 52 |
| 2007 | 30 | 59 |
| 2008 | 63 | 101 |
| 2009 | 37 | 65 |
| 2010 | 46 | 81 |
| 2011 | 64 | 90 |
| 2012 | 49 | 108 |
| 2013 | 87 | 112 |
| 2014 | 93 | 133 |
| 2015 | 108 | 145 |
| 2016 | 109 | 134 |
| 2017 | 91 | 148 |
| 2018 | 107 | 141 |
| 2019 | 158 | 111 |
| 2020 | 128 | 119 |
| 2021 | 117 | 109 |
| 2022 | 84 | 104 |
| 2023 | 90 | 100 |
| 2024 | 99 | 95 |
| 2025 | 85 | 78 |
| 2026 | 56 | 69 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Main groups
Granted patents with any code in the group
- E21C 35/00Details of, or accessories for, machines for slitting or completely freeing the1,665
- E21C 41/00Methods of underground or surface mining766
- E21C 27/00Machines which completely free the mineral from the seam623
- E21C 25/00Cutting machines, i.e. for making slits approximately parallel or perpendicular to the522
- E21C 37/00Mining or quarrying: other methods or devices for dislodging with or without338
- E21C 29/00Propulsion of machines for slitting or completely freeing the mineral from the233
- E21C 31/00Driving means incorporated in machines for slitting or completely freeing the mineral167
- E21C 50/00Obtaining minerals from underwater, not otherwise provided for152
All 16 main groupsShow fewer
- E21C 47/00Machines for obtaining or the removal of materials in open-pit mines124
- E21C 39/00Devices for testing in situ the hardness or other properties of minerals96
- E21C 51/00Apparatus for, or methods of, winning materials from extraterrestrial sources45
- E21C 45/00Methods of hydraulic mining32
- E21C 33/00Trucks or other devices for transporting machines for slitting or completely freeing12
- E21C 49/00Obtaining peat10
- E21C 2100/00Modeling, simulating or designing mining operationsIndexing code6
- E21C 2200/00Mining robotsIndexing code2
Recent patents
- Blasthole stemming based on formaldehyde resins, system and charging method6 Oct 2026US 12,754,001 B2Oxiquim S.A.
- Non-rotating bit for cutting tool22 Sep 2026US 12,741,396 B2Caterpillar Paving Products Inc.
- Method and device for preventing rib spalling in high-stress surrounding rock by hydraulic slotting22 Sep 2026US 12,742,388 B2China University of Mining and Technology
- Optimizing use of battery electric mine vehicles based on simulations22 Sep 2026US 12,743,909 B2Modular Mining Systems, Inc.
- Millimeter-wave directed-energy excavation15 Sep 2026US 12,735,985 B2Massachusetts Institute of Technology
- Monitoring system for excavation equipment8 Oct 2026US 2026/0311313 A1Tesmec S.P.A.
- Rolling Wedge Cutter Drum1 Oct 2026US 2026/0297869 A1
- Steep pit wall mining1 Oct 2026US 2026/0298083 A1
- Mining method24 Sep 2026US 2026/0286844 A1Element Six Limited
- Triggering explosives in holes17 Sep 2026US 2026/0276352 A1Olitek Pty Ltd
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