- All sections
- E - Fixed constructions
- E21F - Safety devices, transport, filling-up, rescue, ventilation, or drainage in or of mines or tunnels
- E21F 15/00 - Methods or devices for placing filling-up materials in underground workings
Patent holdings for IPC class E21F 15/00
Total number of patents in this class: 170
10-year publication summary
|
8
|
6
|
12
|
17
|
17
|
16
|
13
|
16
|
16
|
10
|
| 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | 2025 |