- 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: 22
10-year publication summary
|
1
|
0
|
2
|
0
|
2
|
0
|
0
|
4
|
2
|
1
|
| 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | 2025 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| RAG Aktiengesellschaft | 32 |
4 |
| Joy Global Underground Mining LLC | 347 |
3 |
| Anhui University of Science and Technology | 189 |
2 |
| Nordic Minesteel Technologies Inc. | 35 |
2 |
| Centre for Excellence in Mining Innovation | 3 |
1 |
| Council of Scientific & Industrial Research | 1429 |
1 |
| Shandong University of Science and Technology | 524 |
1 |
| The University of Western Australia | 200 |
1 |
| HeNan Polytechnic University | 98 |
1 |
| Famur S.A. | 5 |
1 |
| Bucyrus DBT Europe GmbH | 10 |
1 |
| Yancoal Australia Ltd | 2 |
1 |
| Chinacoal Beijing Coal Mining Machinery Co., Ltd. | 1 |
1 |
| Xi'an University of Science and Technology | 12 |
1 |
| Nepean Longwall Pty Ltd | 1 |
1 |
| Other owners | 0 |