- All sections
- E - Fixed constructions
- E21C - Mining or quarrying
- E21C 37/20 - Other methods or devices for dislodging with or without loading by ultrasonics
Patent holdings for IPC class E21C 37/20
Total number of patents in this class: 1
10-year publication summary
|
2
|
0
|
0
|
0
|
0
|
0
|
0
|
1
|
0
|
0
|
| 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | 2025 | 2026 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| Shandong University | 1113 |
1 |
| Other owners | 0 |