- All sections
- E - Fixed constructions
- E21D - Shaftstunnelsgallerieslarge underground chambers
- E21D 11/12 - Temporary supports for use during buildingAccessories
Patent holdings for IPC class E21D 11/12
Total number of patents in this class: 5
10-year publication summary
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0
|
2
|
0
|
0
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0
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2
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0
|
0
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0
|
1
|
| 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | 2025 | 2026 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| China Railway Construction Corporation Limited | 8 |
1 |
| China Railway First Survey and Design Institute Group Co., Ltd. | 7 |
1 |
| Shandong Jianzhu University | 94 |
1 |
| Engineering Appraisal and Reinforcement Institute Co.,ltd, Shandong Jianzhu University | 1 |
1 |
| Grupo Empresarial Tecozam, S.L | 9 |
1 |
| Other owners | 0 |