- All sections
- E - Fixed constructions
- E21D - Shaftstunnelsgallerieslarge underground chambers
- E21D 9/00 - Tunnels or galleries, with or without liningsMethods or apparatus for making thereofLayout of tunnels or galleries
Patent holdings for IPC class E21D 9/00
Total number of patents in this class: 521
10-year publication summary
|
21
|
33
|
29
|
34
|
50
|
53
|
40
|
46
|
41
|
32
|
| 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | 2025 | 2026 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| Sandvik Mining and Construction Oy | 889 |
39 |
| Herrenknecht AG | 215 |
29 |
| Shandong University | 1160 |
18 |
| Epiroc Rock Drills Aktiebolag | 670 |
13 |
| China University of Mining and Technology | 1316 |
12 |
| Bouygues Travaux Publics | 29 |
10 |
| Northeastern University | 577 |
9 |
| Enaex Servicios S.A. | 22 |
8 |
| hyperTunnel IP Limited | 25 |
8 |
| Komatsu Ltd. | 4770 |
6 |
| Hanwha Corporation | 312 |
6 |
| Institute of Rock and Soil Mechanics, Chinese Academy of Sciences | 87 |
6 |
| China Railway No. 9 Group Co., Ltd | 29 |
6 |
| Maeda Corporation | 28 |
5 |
| ABB Schweiz AG | 7703 |
4 |
| China Railway Engineering Equipment Group Co., Ltd. | 54 |
4 |
| Dalian University of Technology | 1606 |
4 |
| Dyno Nobel Inc. | 174 |
4 |
| Shandong University of Science and Technology | 546 |
4 |
| GE Infrastructure Technology, LLC | 6153 |
4 |
| Other owners | 322 |