- All sections
- E - Fixed constructions
- E21D - Shafts; tunnels; galleries; large underground chambers
- E21D 1/08 - Sinking shafts while moving the lining downwards
Patent holdings for IPC class E21D 1/08
Total number of patents in this class: 13
10-year publication summary
|
0
|
0
|
1
|
0
|
1
|
1
|
1
|
0
|
0
|
0
|
| 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | 2025 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| Herrenknecht AG | 195 |
3 |
| China Railway Engineering Equipment Group Co., Ltd. | 41 |
1 |
| Master Drilling South Africa (Pty) Ltd. | 3 |
1 |
| Schwindt Hydraulik GmbH | 2 |
1 |
| Technological Resources Pty. Limited | 443 |
1 |
| China Railway Engineering Equipment Group Co., Ltd (creg) | 1 |
1 |
| China Railway No.8 Engineering Group Co., Ltd. | 7 |
1 |
| NK Trading and Engineering GmbH | 3 |
1 |
| Slipform Engineering Ltd | 3 |
1 |
| Redpath Canada Limited | 14 |
1 |
| China Railway Erju 4th Engineering Co., Ltd. | 4 |
1 |
| Other owners | 0 |