- All sections
- E - Fixed constructions
- E21C - Mining or quarrying
- E21C 41/32 - Reclamation of surface-mined areas
Patent holdings for IPC class E21C 41/32
Total number of patents in this class: 26
10-year publication summary
|
2
|
2
|
4
|
1
|
2
|
1
|
2
|
0
|
2
|
1
|
| 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | 2025 | 2026 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| Massachusetts Institute of Technology | 10282 |
2 |
| China University of Mining and Technology | 1315 |
2 |
| Petroleo Brasileiro S.A. - Petrobras | 973 |
2 |
| Weir Canada, Inc. | 22 |
2 |
| HPS Enterprises II, LLC | 2 |
2 |
| A.B.G. Limited | 8 |
1 |
| China University of Mining and Technology, Beijing | 105 |
1 |
| Industry-Academic Cooperation Foundation Gyeongsang National University | 635 |
1 |
| Jri Ingenieria S.A. | 2 |
1 |
| Laurentian University of Sudbury | 13 |
1 |
| Norsk Hydro ASA | 246 |
1 |
| Rheinkalk GmbH | 27 |
1 |
| Shandong University of Science and Technology | 546 |
1 |
| TAKRAF GmbH | 71 |
1 |
| Terra Nova Technologies, Inc. | 1 |
1 |
| ThyssenKrupp Fördertechnik GmbH | 12 |
1 |
| Opti-minez Pty Ltd | 7 |
1 |
| Cosentino Research & Development, S.L. | 50 |
1 |
| Sanmenxia Bomao Industrial Co., Ltd. | 2 |
1 |
| China Energy Group Xinjiang Energy Company Ltd | 1 |
1 |
| Other owners | 1 |