- All sections
- E - Fixed constructions
- E21D - Shaftstunnelsgallerieslarge underground chambers
- E21D 15/50 - Component parts or details of props
Patent holdings for IPC class E21D 15/50
Total number of patents in this class: 8
10-year publication summary
|
0
|
2
|
1
|
1
|
1
|
0
|
1
|
2
|
0
|
0
|
| 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | 2025 | 2026 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| China University of Mining and Technology | 1312 |
3 |
| Cleveland Reclaim Industries, Inc. | 46 |
1 |
| Taiyuan University of Technology | 315 |
1 |
| Huaibei Mining Holdings Co.,Ltd. | 1 |
1 |
| Stand Technologies Pty Ltd | 4 |
1 |
| Zhalainuoer Coal Industry Co., Ltd | 9 |
1 |
| Other owners | 0 |