- 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: 182
10-year publication summary
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9
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14
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18
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22
|
16
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13
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18
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18
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12
|
8
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| 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | 2025 | 2026 |