- All sections
- E - Fixed constructions
- E21D - Shaftstunnelsgallerieslarge underground chambers
- E21D 15/54 - Details of the ends of props
Patent holdings for IPC class E21D 15/54
Total number of patents in this class: 3
10-year publication summary
|
0
|
3
|
1
|
1
|
0
|
0
|
1
|
0
|
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 | 1308 |
2 |
| China Coal Research Institute | 20 |
1 |
| Other owners | 0 |