E21C 41/22
For ores
Official title: for ores, e.g. mining placers
E21C41/22 (For ores) appears on 38 US grants and 40 published applications in this corpus.
Search patents in E21C- Granted patents
- 38
- Published applications
- 40
- Assignees
- 36
- Inventors
- 151
- Latest grant
- 21 Jul 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 1 | 0 |
| 1977 | 0 | 0 |
| 1978 | 4 | 0 |
| 1979 | 0 | 0 |
| 1980 | 0 | 0 |
| 1981 | 0 | 0 |
| 1982 | 0 | 0 |
| 1983 | 2 | 0 |
| 1984 | 1 | 0 |
| 1985 | 0 | 0 |
| 1986 | 1 | 0 |
| 1987 | 0 | 0 |
| 1988 | 0 | 0 |
| 1989 | 0 | 0 |
| 1990 | 1 | 0 |
| 1991 | 1 | 0 |
| 1992 | 0 | 0 |
| 1993 | 0 | 0 |
| 1994 | 0 | 0 |
| 1995 | 0 | 0 |
| 1996 | 0 | 0 |
| 1997 | 0 | 0 |
| 1998 | 0 | 0 |
| 1999 | 0 | 0 |
| 2000 | 0 | 0 |
| 2001 | 0 | 0 |
| 2002 | 0 | 0 |
| 2003 | 0 | 0 |
| 2004 | 0 | 0 |
| 2005 | 0 | 0 |
| 2006 | 0 | 0 |
| 2007 | 0 | 0 |
| 2008 | 0 | 0 |
| 2009 | 0 | 1 |
| 2010 | 0 | 0 |
| 2011 | 0 | 0 |
| 2012 | 0 | 1 |
| 2013 | 0 | 1 |
| 2014 | 2 | 1 |
| 2015 | 0 | 2 |
| 2016 | 0 | 1 |
| 2017 | 0 | 2 |
| 2018 | 2 | 4 |
| 2019 | 4 | 2 |
| 2020 | 3 | 1 |
| 2021 | 3 | 3 |
| 2022 | 1 | 2 |
| 2023 | 2 | 8 |
| 2024 | 5 | 3 |
| 2025 | 4 | 4 |
| 2026 | 1 | 4 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
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
- Hydraulic fracturing a rock mass11 Nov 2025US 12,467,359 B2Newcrest Mining Limited
- Raise caving method for mining deposits, and a mining infrastructure, monitoring system, machinery, control system and data medium therefor21 Oct 2025US 12,448,889 B2Luossavaara-Kiirunavaara AB
- Rock-piercing flexible rock drilling robot and rock breaking method12 Aug 2025US 12,385,391 B2Central South University
- Measurement system and measurement method1 Jul 2025US 12,345,159 B2Komatsu Ltd.
- Wellbore controllable chamber-forming granular-flow mining system6 Aug 2026US 2026/0226817 A1Blueland Technology Limited
- In situ leach mining using electrical reservoir stimulation18 Jun 2026US 2026/0168369 A1Eden GeoPower, Inc.
- Raise caving method for mining deposits, and a mining infrastructure, monitoring system, machinery, control system and data medium therefor14 May 2026US 2026/0132716 A1Luossavaara-Kiirunavaara AB
- Flexible electrode tube for electrified rare earth mining and application method therefor12 Feb 2026US 2026/0043328 A1Guangzhou Institute of Geochemistry, Chinese Academy of Sciences
- Modular platform system for vertical ore stope mining11 Sep 2025US 2025/0283408 A1Nordic Minesteel Technologies Inc.
Most cited
By later US patents
- Open pit mine25US 4,103,972 A1978
- Mining method15US 4,458,947 ABoart International Limited · 1984
- Method and equipment for narrow ore mining13US 5,007,683 AAlimak AB · 1991
- Mining methods as such and combined with equipment10US 3,975,053 A1976
- Mining method7US 4,123,109 AEdenvale Engineering Works (Proprietary) Limited · 1978