- All sections
- E - Fixed constructions
- E21D - Shaftstunnelsgallerieslarge underground chambers
- E21D 11/10 - Lining with building materials with concrete cast in situShuttering or other equipment adapted therefor
Patent holdings for IPC class E21D 11/10
Total number of patents in this class: 334
10-year publication summary
|
12
|
12
|
18
|
31
|
27
|
37
|
29
|
28
|
34
|
20
|
| 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | 2025 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| Shandong University of Science and Technology | 522 |
11 |
| China University of Mining and Technology | 1253 |
9 |
| Denka Company Limited | 2566 |
6 |
| China Railway Siyuan Survey and Design Group Co., Ltd. | 69 |
6 |
| Shandong Jianzhu University | 88 |
6 |
| Putzmeister Engineering GmbH | 337 |
5 |
| KERN Tunneltechnik SA | 10 |
5 |
| Apache Industrial Services, Inc. | 46 |
4 |
| Sointek S.r.l. | 5 |
4 |
| China Railway 14th Bureau Group Co., Ltd. | 14 |
4 |
| Ccteg Coal Mining Research Institute | 38 |
4 |
| Technicore Underground Inc. | 8 |
4 |
| Grupo Empresarial Tecozam, S.L | 7 |
4 |
| China Railway Engineering Equipment Group Co., Ltd. | 46 |
3 |
| Ocean University of China | 189 |
3 |
| S & P Clever Reinforcement Company AG | 29 |
3 |
| Sandvik Mining and Construction Oy | 826 |
3 |
| Sika Technology AG | 2858 |
3 |
| Normet Oy | 46 |
3 |
| Chang'an University | 169 |
3 |
| Other owners | 241 |