- All sections
- E - Fixed constructions
- E21D - Shaftstunnelsgallerieslarge 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
|
3
|
1
|
2
|
4
|
0
|
1
|
3
|
1
|
0
|
0
|
| 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | 2025 | 2026 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| Joy Global Underground Mining LLC | 344 |
6 |
| Anhui University of Science and Technology | 199 |
2 |
| China University of Mining and Technology | 1316 |
2 |
| Swanson Industries, Inc. | 12 |
2 |
| Caterpillar Inc. | 10302 |
1 |
| Bucyrus Europe GmbH | 32 |
1 |
| Famur S.A. | 5 |
1 |
| China Coal Research Institute | 20 |
1 |
| Ccteg Coal Mining Research Institute | 44 |
1 |
| Ccteg Chinese Institute of Coal Science | 7 |
1 |
| Ccteg Tiandi Science & Technology Co., Ltd. | 10 |
1 |
| FCI Holdings Delaware, LLC | 104 |
1 |
| Other owners | 0 |