- All sections
- E - Fixed constructions
- E21D - Shaftstunnelsgallerieslarge underground chambers
- E21D 23/00 - Mine roof supports for step-by-step movement, e.g. in combination with provisions for shifting of conveyors, mining machines or guides therefor
Patent holdings for IPC class E21D 23/00
Total number of patents in this class: 66
10-year publication summary
|
5
|
10
|
5
|
2
|
10
|
1
|
4
|
9
|
5
|
1
|
| 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | 2025 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| Joy Global Underground Mining LLC | 347 |
10 |
| RAG Aktiengesellschaft | 32 |
8 |
| Swanson Industries, Inc. | 11 |
5 |
| Caterpillar Inc. | 9593 |
3 |
| Taiyuan University of Technology | 259 |
3 |
| China University of Mining and Technology | 1257 |
2 |
| Sandvik Intellectual Property AB | 1481 |
2 |
| Shandong University of Science and Technology | 524 |
2 |
| Manchao He | 4 |
2 |
| Beijing Ccri-tianma Automation Technology Co., Ltd. | 66 |
2 |
| Ccteg Beijing Tianma Intelligent Control Technology Co., Ltd. | 41 |
2 |
| Caterpillar Global Mining Europe GmbH | 85 |
1 |
| Caterpillar Global Mining LLC | 203 |
1 |
| Cougar Can Company Pty Ltd. | 3 |
1 |
| Joy MM Delaware, Inc. | 56 |
1 |
| Tiefenbach Control Systems GmbH | 18 |
1 |
| Zhejiang University | 3167 |
1 |
| Zhou Bin | 29 |
1 |
| HeNan Polytechnic University | 98 |
1 |
| Zhengzhou Coal Mining Machinery Group Company Limited | 5 |
1 |
| Other owners | 16 |