- All sections
- E - Fixed constructions
- E21F - Safety devices, transport, filling-up, rescue, ventilation, or drainage in or of mines or tunnels
- E21F 7/00 - Methods or devices for drawing-off gases with or without subsequent use of the gas for any purpose
Patent holdings for IPC class E21F 7/00
Total number of patents in this class: 155
10-year publication summary
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13
|
16
|
25
|
13
|
8
|
10
|
7
|
12
|
7
|
2
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| 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | 2025 | 2026 |