E21C 27/14
Breaking-down effected by force or pressure applied to side of slit
Official title: breaking-down effected by force or pressure applied to side of slit, e.g. by wedges (breaking-down by means inserted in boreholes E21C37/00)
E21C27/14 (Breaking-down effected by force or pressure applied to side of slit) appears on 16 US grants and 11 published applications in this corpus.
Search patents in E21C- Granted patents
- 16
- Published applications
- 11
- Assignees
- 6
- Inventors
- 15
- Latest grant
- 12 Aug 2025
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1978 | 2 | 0 |
| 1979 | 0 | 0 |
| 1980 | 0 | 0 |
| 1981 | 1 | 0 |
| 1982 | 0 | 0 |
| 1983 | 1 | 0 |
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| 2010 | 0 | 0 |
| 2011 | 0 | 0 |
| 2012 | 0 | 0 |
| 2013 | 0 | 0 |
| 2014 | 0 | 1 |
| 2015 | 0 | 0 |
| 2016 | 1 | 0 |
| 2017 | 0 | 4 |
| 2018 | 0 | 0 |
| 2019 | 2 | 0 |
| 2020 | 3 | 2 |
| 2021 | 1 | 1 |
| 2022 | 3 | 1 |
| 2023 | 1 | 0 |
| 2024 | 0 | 2 |
| 2025 | 1 | 0 |
By publication year. Applications have been published since 2001.
Subgroups
Granted patents
Recent patents
- Cutter head for mining machine12 Aug 2025US 12,385,395 B2Joy Global Underground Mining LLC
- Method for removing material from a rock wall15 Aug 2023US 11,725,512 B2Joy Global Underground Mining LLC
- Cutting device with tapered cutting element15 Nov 2022US 11,499,426 B2Joy Global Underground Mining LLC
- Cutter head for mining machine28 Jun 2022US 11,371,346 B2Joy Global Underground Mining LLC
- Cutter head for mining machine24 May 2022US 11,339,657 B2Joy 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
- Cutting device with tapered cutting element4 Feb 2021US 2021/0032989 A1Joy Global Underground Mining LLC
- Cutting head having segmented cutting disc9 Jul 2020US 2020/0217198 A1Joy Global Underground Mining LLC
Most cited
By later US patents
- 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
- Core eliminator for mining, road working or earth moving machinery5US 4,391,472 AThe Cincinnati Mine Machinery Company · 1983
- Cutting device with tapered cutting element2US 10,808,531 B2Joy Global Underground Mining LLC · 2020