- All sections
- E - Fixed constructions
- E21D - Shafts; tunnels; galleries; large underground chambers
- E21D 23/06 - Special mine caps or special tops of pit-props for permitting step-by-step movement
Patent holdings for IPC class E21D 23/06
Total number of patents in this class: 20
10-year publication summary
|
1
|
3
|
1
|
2
|
4
|
0
|
1
|
2
|
1
|
0
|
| 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 |
6 |
| China University of Mining and Technology | 1220 |
2 |
| Swanson Industries, Inc. | 12 |
2 |
| Caterpillar Inc. | 9149 |
1 |
| Anhui University of Science and Technology | 176 |
1 |
| Bucyrus Europe GmbH | 32 |
1 |
| Burrell Mining Products, Inc. | 9 |
1 |
| Li, Xinbin | 3 |
1 |
| Famur S.A. | 7 |
1 |
| China Coal Research Institute | 19 |
1 |
| Ccteg Coal Mining Research Institute | 29 |
1 |
| Ccteg Chinese Institute of Coal Science | 5 |
1 |
| Ccteg Tiandi Science & Technology Co., Ltd. | 6 |
1 |
| Other owners | 0 |