- All sections
- E - Fixed constructions
- E21B - Earth or rock drilling; obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B 1/04 - Devices for reversing the movement of the rod or cable at the surface
Patent holdings for IPC class E21B 1/04
Total number of patents in this class: 5
10-year publication summary
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1
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0
|
1
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0
|
1
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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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| 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | 2025 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| Augspurger Komm Engineering, Inc. | 1 |
1 |
| Eurodrill GmbH | 26 |
1 |
| TMS Co., Ltd. | 23 |
1 |
| Tracto-Technik GmbH & Co. KG | 171 |
1 |
| Bestway Oilfield, Inc. | 20 |
1 |
| Other owners | 0 |