- All sections
- E - Fixed constructions
- E21D - Shafts; tunnels; galleries; large underground chambers
- E21D 23/04 - Structural features of the supporting construction, e.g. linking members between adjacent frames or sets of props; Means for counteracting lateral sliding on inclined floor
Patent holdings for IPC class E21D 23/04
Total number of patents in this class: 64
10-year publication summary
|
3
|
3
|
8
|
7
|
3
|
9
|
3
|
3
|
10
|
1
|
| 2015 | 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 |