- 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 43/285 - Melting minerals, e.g. sulfur
Patent holdings for IPC class E21B 43/285
Total number of patents in this class: 14
10-year publication summary
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1
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0
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1
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2
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1
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2
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1
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1
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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
|
|---|---|---|
| China Petroleum & Chemical Corporation | 1913 |
2 |
| Lamrock Canada Incorporated | 8 |
2 |
| SunCor Energy Inc. | 745 |
2 |
| Steam Injection Technology Service Center of Shenglioilfield Sinopec | 3 |
2 |
| Cenovus Energy Inc. | 419 |
1 |
| ExxonMobil Upstream Research Company | 2390 |
1 |
| Northeastern University | 544 |
1 |
| The University of Bristol | 258 |
1 |
| Locus Oil IP Company, LLC | 23 |
1 |
| Baker Hughes Holdings LLC | 2999 |
1 |
| Other owners | 0 |