- 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 25/12 - Formed core retaining or severing means of the sliding wedge type
Patent holdings for IPC class E21B 25/12
Total number of patents in this class: 7
10-year publication summary
|
0
|
3
|
0
|
1
|
0
|
0
|
1
|
0
|
0
|
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
|
|---|---|---|
| Baker Hughes Incorporated | 5504 |
1 |
| Bly IP Inc. | 35 |
1 |
| CT Tech Pty Ltd | 2 |
1 |
| Shenzhen University | 1605 |
1 |
| Sichuan University | 540 |
1 |
| Baker Hughes, a GE Company, LLC | 2138 |
1 |
| Boart Longyear Company | 268 |
1 |
| Other owners | 0 |