- All sections
- E - Fixed constructions
- E21C - Mining or quarrying
- E21C 37/08 - Devices with pistons, plungers, or the like pressed locally against the wall of the borehole
Patent holdings for IPC class E21C 37/08
Total number of patents in this class: 6
10-year publication summary
|
0
|
1
|
3
|
0
|
0
|
0
|
1
|
0
|
0
|
1
|
| 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | 2025 | 2026 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| Korea Railroad Research Institute | 184 |
2 |
| China University of Mining and Technology | 1316 |
1 |
| Xuzhou Zhirun Mining Equipment Science and Technology Co., Ltd. | 29 |
1 |
| DARDA GmbH | 1 |
1 |
| Songam Co., Ltd. | 3 |
1 |
| Other owners | 0 |