- All sections
- E - Fixed constructions
- E21D - Shaftstunnelsgallerieslarge underground chambers
- E21D 15/60 - Devices for withdrawing props or chocks
Patent holdings for IPC class E21D 15/60
Total number of patents in this class: 9
10-year publication summary
|
0
|
1
|
1
|
1
|
2
|
1
|
0
|
1
|
1
|
0
|
| 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | 2025 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| China University of Mining and Technology | 1268 |
6 |
| Shandong University of Science and Technology | 528 |
1 |
| China Coal Research Institute | 20 |
1 |
| Huating Coal Group Co., Ltd. | 1 |
1 |
| Other owners | 0 |