- All sections
- E - Fixed constructions
- E21D - Shaftstunnelsgallerieslarge underground chambers
- E21D 23/03 - Mine roof supports for step-by-step movement, e.g. in combination with provisions for shifting of conveyors, mining machines or guides therefor having protective means, e.g. shields, for preventing or impeding entry of loose material into the working space or support
Patent holdings for IPC class E21D 23/03
Total number of patents in this class: 23
10-year publication summary
|
0
|
3
|
0
|
2
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0
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0
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5
|
2
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1
|
0
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| 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | 2025 | 2026 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| RAG Aktiengesellschaft | 30 |
4 |
| Anhui University of Science and Technology | 195 |
3 |
| Joy Global Underground Mining LLC | 347 |
3 |
| Nordic Minesteel Technologies Inc. | 37 |
2 |
| Centre for Excellence in Mining Innovation | 3 |
1 |
| Council of Scientific & Industrial Research | 1431 |
1 |
| Shandong University of Science and Technology | 539 |
1 |
| The University of Western Australia | 196 |
1 |
| HeNan Polytechnic University | 102 |
1 |
| Famur S.A. | 5 |
1 |
| Bucyrus DBT Europe GmbH | 7 |
1 |
| Yancoal Australia Ltd | 2 |
1 |
| Chinacoal Beijing Coal Mining Machinery Co., Ltd. | 1 |
1 |
| Nepean Longwall Pty Ltd | 1 |
1 |
| XI'AN UNIVERSITY OF SCIENCE AND TECHNOLOGY Xi'an, China | 1 |
1 |
| Other owners | 0 |