- All sections
- E - Fixed constructions
- E21F - Safety devices, transport, filling-up, rescue, ventilation, or drainage in or of mines or tunnels
- E21F 5/08 - Rock dustingDepositing other protective substances
Patent holdings for IPC class E21F 5/08
Total number of patents in this class: 10
10-year publication summary
|
3
|
0
|
0
|
2
|
2
|
0
|
0
|
0
|
1
|
0
|
| 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | 2025 | 2026 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| Imerys USA, Inc. | 136 |
3 |
| China University of Mining and Technology | 1295 |
2 |
| IEC Europe SARL | 2 |
2 |
| Shandong University of Science and Technology | 542 |
2 |
| Rusmar Incorporated | 2 |
1 |
| Other owners | 0 |