- 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 25/16 - Apparatus for obtaining or removing undisturbed cores, e.g. core barrels or core extractors for obtaining oriented cores
Patent holdings for IPC class E21B 25/16
Total number of patents in this class: 144
10-year publication summary
|
3
|
7
|
6
|
8
|
5
|
5
|
5
|
11
|
4
|
3
|
| 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | 2025 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| Reflex Instruments Asia Pacific Pty Ltd | 86 |
18 |
| Imdex Technologies Pty Ltd | 71 |
14 |
| Halliburton Energy Services, Inc. | 20964 |
11 |
| Schlumberger Technology Corporation | 10898 |
10 |
| globalTech Corporation Pty Ltd | 27 |
9 |
| 2iC Australia Pty Ltd | 10 |
7 |
| Veracio Ltd. | 63 |
6 |
| Boart Longyear Company | 157 |
5 |
| Stockholm Precision Tools S.L | 10 |
5 |
| Schlumberger Canada Limited | 7369 |
3 |
| Baker Hughes Incorporated | 5246 |
3 |
| Australian Mud Company Pty Ltd | 16 |
3 |
| Saudi Arabian Oil Company | 13409 |
3 |
| Services Petroliers Schlumberger | 5830 |
3 |
| Schlumberger Technology B.v. | 5184 |
2 |
| Schlumberger Holdings Limited | 2800 |
2 |
| Bly IP Inc. | 31 |
2 |
| Devico AS | 21 |
2 |
| Imdex Global B.V. | 10 |
2 |
| Imdex Technology Australia Pty Ltd | 8 |
2 |
| Other owners | 32 |