E21C 27/10
Machines which completely free the mineral from the seam: by both slitting
Official title: by both slitting and breaking-down
E21C27/10 (Machines which completely free the mineral from the seam: by both slitting) appears on 40 US grants and 32 published applications in this corpus.
Search patents in E21C- Granted patents
- 40
- Published applications
- 32
- Assignees
- 16
- Inventors
- 57
- Latest grant
- 24 Mar 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 1 | 0 |
| 1977 | 0 | 0 |
| 1978 | 2 | 0 |
| 1979 | 0 | 0 |
| 1980 | 0 | 0 |
| 1981 | 3 | 0 |
| 1982 | 1 | 0 |
| 1983 | 1 | 0 |
| 1984 | 0 | 0 |
| 1985 | 0 | 0 |
| 1986 | 0 | 0 |
| 1987 | 0 | 0 |
| 1988 | 0 | 0 |
| 1989 | 0 | 0 |
| 1990 | 0 | 0 |
| 1991 | 0 | 0 |
| 1992 | 0 | 0 |
| 1993 | 0 | 0 |
| 1994 | 1 | 0 |
| 1995 | 1 | 0 |
| 1996 | 0 | 0 |
| 1997 | 0 | 0 |
| 1998 | 0 | 0 |
| 1999 | 0 | 0 |
| 2000 | 0 | 0 |
| 2001 | 1 | 0 |
| 2002 | 1 | 0 |
| 2003 | 0 | 0 |
| 2004 | 0 | 0 |
| 2005 | 0 | 0 |
| 2006 | 0 | 0 |
| 2007 | 0 | 0 |
| 2008 | 0 | 0 |
| 2009 | 0 | 0 |
| 2010 | 0 | 0 |
| 2011 | 0 | 0 |
| 2012 | 0 | 2 |
| 2013 | 0 | 1 |
| 2014 | 1 | 2 |
| 2015 | 0 | 3 |
| 2016 | 2 | 2 |
| 2017 | 1 | 6 |
| 2018 | 1 | 2 |
| 2019 | 5 | 1 |
| 2020 | 4 | 3 |
| 2021 | 3 | 5 |
| 2022 | 6 | 2 |
| 2023 | 2 | 0 |
| 2024 | 1 | 3 |
| 2025 | 1 | 0 |
| 2026 | 1 | 0 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Rackbar rotation limit24 Mar 2026US 12,584,409 B2Joy Global Underground Mining LLC
- Cutter head for mining machine12 Aug 2025US 12,385,395 B2Joy Global Underground Mining LLC
- Hydraulic hammering device27 Aug 2024US 12,070,844 B2Furukawa Rock Drill Co., Ltd.
- Method for removing material from a rock wall15 Aug 2023US 11,725,512 B2Joy Global Underground Mining LLC
- Hydraulic hammering device28 Feb 2023US 11,590,642 B2Furukawa Rock Drill Co., Ltd.
- Rackbar rotation limit12 Sep 2024US 2024/0301793 A1Joy Global Underground Mining LLC
- Method of mining a rock formation using a disc cutter and a rock breaker tool25 Jul 2024US 2024/0247588 A1Element Six (UK) Limited
- Cutter head for mining machine18 Apr 2024US 2024/0125232 A1Joy Global Underground Mining LLC
- Cutter head for mining machine3 Nov 2022US 2022/0349306 A1Joy Global Underground Mining LLC
- Hydraulic Hammering Device24 Feb 2022US 2022/0055196 A1Furukawa Rock Drill Co., Ltd.
Most cited
By later US patents
- Apparatus for extracting minerals through a borehole81US 4,278,137 AStamicarbon B. V. · 1981
- Mineral winning machines37US 4,273,383 AGewerkschaft Eisenhutte Westfalia · 1981
- Drag bit excavation19US 4,087,131 ARapidex, Inc. · 1978
- Cutter head for mining machine19US 9,470,087 B2Joy MM Delaware, Inc. · 2016
- Articulated support15US 3,999,805 ALockwood Bennett Ltd. · 1976