- 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 44/10 - Arrangements for automatic stopping when the tool is lifted from the working face
Patent holdings for IPC class E21B 44/10
Total number of patents in this class: 25
10-year publication summary
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0
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1
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3
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4
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4
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4
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2
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3
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1
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1
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| 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | 2025 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| Schlumberger Technology Corporation | 10820 |
8 |
| The Charles Machine Works, Inc. | 407 |
6 |
| Helmerich & Payne Technologies, LLC | 102 |
5 |
| Schlumberger Canada Limited | 7350 |
1 |
| Schlumberger Technology B.v. | 5181 |
1 |
| ExxonMobil Upstream Research Company | 2395 |
1 |
| Mhwirth AS | 130 |
1 |
| Services Petroliers Schlumberger | 5817 |
1 |
| Maersk Drilling A/S | 47 |
1 |
| Other owners | 0 |