- All sections
- E - Fixed constructions
- E21D - Shaftstunnelsgallerieslarge underground chambers
- E21D 15/55 - Details of the ends of props of prop heads
Patent holdings for IPC class E21D 15/55
Total number of patents in this class: 14
10-year publication summary
|
1
|
2
|
1
|
0
|
4
|
0
|
2
|
0
|
1
|
0
|
| 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | 2025 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| China University of Mining and Technology | 1245 |
2 |
| R. J. Goldspink Pty Limited | 4 |
2 |
| Caterpillar Inc. | 9521 |
1 |
| Caterpillar Global Mining Europe GmbH | 85 |
1 |
| Burrell Mining Products, Inc. | 5 |
1 |
| Cougar Can Company Pty Ltd. | 3 |
1 |
| FCI Holdings Delaware, Inc. | 61 |
1 |
| Form 700 Pty Ltd | 27 |
1 |
| R.J. Goldspink PTY Limited | 6 |
1 |
| Setevox (Pty) Ltd | 3 |
1 |
| China Mining & Civil New Material Science and Technology Ltd. | 11 |
1 |
| FCI Holdings Delaware, LLC | 84 |
1 |
| Other owners | 0 |