- All sections
- E - Fixed constructions
- E21B - Earth or rock drillingobtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B 21/18 - Preventing exhaust air from the drill motor from blowing-off towards the working face
Patent holdings for IPC class E21B 21/18
Total number of patents in this class: 6
10-year publication summary
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0
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0
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0
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0
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4
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0
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2
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0
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0
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0
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| 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | 2025 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| Sandvik Mining and Construction Oy | 826 |
6 |
| Other owners | 0 |