- All sections
- E - Fixed constructions
- E21D - Shaftstunnelsgallerieslarge underground chambers
- E21D 9/11 - Making by using boring or cutting machines with a rotary drilling-head cutting simultaneously the whole cross-section, i.e. full-face machines
Patent holdings for IPC class E21D 9/11
Total number of patents in this class: 130
10-year publication summary
|
8
|
12
|
8
|
10
|
13
|
7
|
13
|
14
|
6
|
4
|
| 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | 2025 | 2026 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| Komatsu Ltd. | 4759 |
23 |
| Herrenknecht AG | 215 |
15 |
| Sandvik Intellectual Property AB | 1389 |
11 |
| Sandvik Mining and Construction G.m.b.H. | 94 |
4 |
| Shandong University | 1158 |
4 |
| Robbins Mining, Inc. | 9 |
4 |
| Bergteamet AB | 11 |
3 |
| Canadian Energy Services LP | 74 |
3 |
| Dalian University of Technology | 1601 |
3 |
| Hitachi Zosen Corporation | 589 |
3 |
| US Synthetic Corporation | 617 |
3 |
| Master Sinkers (Pty) Ltd | 7 |
3 |
| Drilling Technical Services (Pty) Ltd | 3 |
3 |
| Underground Infrastructure Technologies Corporation | 10 |
3 |
| Bouygues Travaux Publics | 29 |
2 |
| China Railway Engineering Equipment Group Co., Ltd. | 54 |
2 |
| China University of Mining and Technology, Beijing | 105 |
2 |
| The University of Tokyo | 4380 |
2 |
| Joy Global Underground Mining LLC | 344 |
2 |
| Korea Radioactive Waste Agency | 28 |
2 |
| Other owners | 33 |