- All sections
- E - Fixed constructions
- E21D - Shaftstunnelsgallerieslarge underground chambers
- E21D 9/093 - Control of the driving shield
Patent holdings for IPC class E21D 9/093
Total number of patents in this class: 47
10-year publication summary
|
1
|
2
|
0
|
3
|
3
|
5
|
2
|
3
|
15
|
2
|
| 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. | 50 |
4 |
| Arcbyt, Inc. | 14 |
3 |
| CCCC National Engineering Research Center of Dredging Technology and Equipment Co., Ltd. | 32 |
3 |
| Hitachi Zosen Corporation | 608 |
2 |
| Shandong University | 1128 |
2 |
| Zhejiang University | 3367 |
2 |
| China Railway 14th Bureau Group Co., Ltd. | 14 |
2 |
| China Railway Siyuan Survey and Design Group Co., Ltd. | 69 |
2 |
| Daido Corporation | 2 |
2 |
| EarthGrid PBC | 27 |
2 |
| Caterpillar Inc. | 10167 |
1 |
| Central South University | 473 |
1 |
| China University of Mining and Technology | 1292 |
1 |
| Herrenknecht AG | 208 |
1 |
| Korea Institute of Civil Engineering and Building Technology | 138 |
1 |
| Shenzhen University | 1709 |
1 |
| Kawasaki Jukogyo Kabushiki Kaisha (trading as Kawasaki Heavy Industries, Ltd.) | 3199 |
1 |
| China Railway Tunneling Equipment Co., Ltd. | 3 |
1 |
| Jamal Rostami Engineering Services LLC | 4 |
1 |
| TopEng Inc. | 5 |
1 |
| Other owners | 13 |