- All sections
- E - Fixed constructions
- E21D - Shafts; tunnels; galleries; large 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: 107
10-year publication summary
|
10
|
14
|
8
|
12
|
8
|
10
|
12
|
7
|
9
|
3
|
| 2015 | 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| Komatsu Ltd. | 4265 |
17 |
| Sandvik Intellectual Property AB | 1634 |
11 |
| Herrenknecht AG | 186 |
9 |
| Sandvik Mining and Construction G.m.b.H. | 85 |
4 |
| Underground Infrastructure Technologies Corporation | 11 |
4 |
| Bouygues Travaux Publics | 30 |
3 |
| Canadian Energy Services LP | 67 |
3 |
| Dalian University of Technology | 1387 |
3 |
| Hitachi Zosen Corporation | 609 |
3 |
| Shandong University | 886 |
3 |
| US Synthetic Corporation | 601 |
3 |
| Master Sinkers (Pty) Ltd | 7 |
3 |
| Drilling Technical Services (Pty) Ltd | 3 |
3 |
| Bergteamet AB | 10 |
2 |
| China Railway Engineering Equipment Group Co., Ltd. | 40 |
2 |
| China University of Mining and Technology, Beijing | 66 |
2 |
| The University of Tokyo | 3903 |
2 |
| Joy Global Underground Mining LLC | 331 |
2 |
| China University of Mining and Technology | 1189 |
1 |
| Commonwealth Scientific and Industrial Research Organisation | 1652 |
1 |
| Other owners | 26 |