- 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 19/089 - Apparatus for feeding the rods or cablesApparatus for increasing or decreasing the pressure on the drilling toolApparatus for counterbalancing the weight of the rods with a spring or an additional weight
Patent holdings for IPC class E21B 19/089
Total number of patents in this class: 6
10-year publication summary
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0
|
1
|
0
|
1
|
1
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3
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0
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2
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4
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0
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| 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | 2025 | 2026 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| Forum US, Inc. | 345 |
2 |
| GR Energy Services Management, LP | 42 |
2 |
| Hainan Zhuodian High-Tech Development Co., Ltd. | 3 |
1 |
| Vertx Artificial Lift Inc. | 2 |
1 |
| Other owners | 0 |