- 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 4/08 - Down-hole impacting means, e.g. hammers impact being obtained by gravity only, e.g. with lost-motion connection
Patent holdings for IPC class E21B 4/08
Total number of patents in this class: 0
10-year publication summary
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0
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1
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0
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0
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0
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0
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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
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This class
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|---|---|---|
| Other owners | 0 |