- All sections
- E - Fixed constructions
- E21D - Shaftstunnelsgallerieslarge underground chambers
- E21D 9/08 - Making by using a driving shield with additional boring or cutting means
Patent holdings for IPC class E21D 9/08
Total number of patents in this class: 94
10-year publication summary
|
4
|
12
|
5
|
5
|
10
|
7
|
6
|
7
|
0
|
4
|
| 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | 2025 | 2026 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| China Railway Engineering Equipment Group Co., Ltd. | 54 |
11 |
| The Robbins Company | 9 |
6 |
| China Railway Tunnel Group Co., Ltd | 24 |
5 |
| Vermeer Manufacturing Company | 676 |
4 |
| State Key Laboratory of Shield Machine and Boring Technology | 16 |
4 |
| Dalian University of Technology | 1601 |
3 |
| Korea Railroad Research Institute | 184 |
3 |
| P.I. Engineering, Inc. | 11 |
3 |
| Underground Infrastructure Technologies Corporation | 10 |
3 |
| Herrenknecht AG | 215 |
2 |
| Sandvik Mining and Construction G.m.b.H. | 94 |
2 |
| Master Sinkers (Pty) Ltd | 7 |
2 |
| an Engineering Co., Ltd. | 4 |
2 |
| China Railway 14th Bureau Group Co., Ltd. | 14 |
2 |
| China Railway Construction Heavy Industry Co., Ltd | 25 |
2 |
| Tianhe Mechanical Equipment Manufacturing Co., Ltd. | 2 |
2 |
| Robbins Mining, Inc. | 9 |
2 |
| Caterpillar Inc. | 10299 |
1 |
| Bouygues Travaux Publics | 29 |
1 |
| China University of Mining and Technology | 1316 |
1 |
| Other owners | 33 |