- All sections
- E - Fixed constructions
- E21C - Mining or quarrying
- E21C 27/14 - Machines which completely free the mineral from the seam by both slitting and breaking-down breaking-down effected by force or pressure applied to side of slit, e.g. by wedges
Patent holdings for IPC class E21C 27/14
Total number of patents in this class: 3
10-year publication summary
|
0
|
0
|
1
|
0
|
0
|
0
|
0
|
0
|
1
|
0
|
| 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | 2025 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| Joy MM Delaware, Inc. | 56 |
1 |
| Joy Global Underground Mining LLC | 352 |
1 |
| Element Six (UK) Limited | 221 |
1 |
| Other owners | 0 |