- 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: 143
10-year publication summary
|
4
|
13
|
7
|
8
|
5
|
7
|
5
|
15
|
4
|
1
|
| 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | 2025 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| globalTech Corporation Pty Ltd | 53 |
19 |
| Reflex Instruments Asia Pacific Pty Ltd | 86 |
18 |
| Halliburton Energy Services, Inc. | 20788 |
11 |
| Schlumberger Technology Corporation | 10652 |
10 |
| 2iC Australia Pty Ltd | 10 |
7 |
| Veracio Ltd. | 63 |
6 |
| Boart Longyear Company | 154 |
5 |
| Stockholm Precision Tools S.L | 10 |
5 |
| Schlumberger Canada Limited | 7266 |
3 |
| Baker Hughes Incorporated | 5279 |
3 |
| Australian Mud Company Pty Ltd | 16 |
3 |
| Saudi Arabian Oil Company | 12911 |
3 |
| Services Petroliers Schlumberger | 5771 |
3 |
| Schlumberger Technology B.v. | 5160 |
2 |
| Schlumberger Holdings Limited | 2839 |
2 |
| Bly IP Inc. | 31 |
2 |
| Devico AS | 21 |
2 |
| Imdex Global B.V. | 10 |
2 |
| Imdex Technology Australia Pty Ltd | 8 |
2 |
| Prad Research and Development Limited | 2693 |
2 |
| Other owners | 33 |