- All sections
- E - Fixed constructions
- E21F - Safety devices, transport, filling-up, rescue, ventilation, or drainage in or of mines or tunnels
- E21F 16/00 - Drainage
Patent holdings for IPC class E21F 16/00
Total number of patents in this class: 35
10-year publication summary
|
2
|
2
|
0
|
3
|
1
|
2
|
2
|
7
|
2
|
2
|
| 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 | 1269 |
7 |
| China Shenhua Energy Company Limited | 24 |
2 |
| China University of Mining and Technology, Beijing | 95 |
2 |
| China University of Mining & Technology (Beijing) | 43 |
2 |
| Sturda, Inc. | 4 |
2 |
| Weir Minerals Australia, Ltd. | 306 |
2 |
| Huainan Mining (Group) Co., Ltd. | 15 |
2 |
| Ping 'an Coal Mining Engineering Technology Research Institute Co., Ltd | 15 |
2 |
| A.B.G. Limited | 8 |
1 |
| Aquatic Life Ltd., | 6 |
1 |
| Floodbreak, L.L.C. | 33 |
1 |
| Giertsen Tunnel AS | 1 |
1 |
| Shandong University of Science and Technology | 530 |
1 |
| Taiyuan University of Technology | 264 |
1 |
| WSP Global Inc. | 32 |
1 |
| Genesis Alkali Wyoming, LP | 3 |
1 |
| HeNan Polytechnic University | 101 |
1 |
| Jiangsu Vocational Institute of Architectural Technology | 10 |
1 |
| Wanbao Mining Ltd. | 7 |
1 |
| China Railway 18 Bureau Group Co., Ltd. | 9 |
1 |
| Other owners | 2 |