- 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 25/02 - Apparatus for obtaining or removing undisturbed cores, e.g. core barrels or core extractors the core receiver being insertable into, or removable from, the borehole without withdrawing the drilling pipe
Patent holdings for IPC class E21B 25/02
Total number of patents in this class: 151
10-year publication summary
|
13
|
8
|
13
|
13
|
7
|
10
|
18
|
12
|
6
|
6
|
| 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | 2025 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| Boart Longyear Manufacturing and Distribution Inc. | 112 |
14 |
| Halliburton Energy Services, Inc. | 20862 |
10 |
| Reflex Instruments Asia Pacific Pty Ltd | 86 |
10 |
| Longyear TM, Inc. | 103 |
8 |
| Sichuan University | 564 |
6 |
| Atlas Copco Canada Inc. | 21 |
5 |
| Sandvik Intellectual Property AB | 1484 |
5 |
| Shenzhen University | 1638 |
5 |
| Baker Hughes Incorporated | 5273 |
4 |
| Boart Longyear Company | 156 |
4 |
| Priority Drilling Ltd | 4 |
4 |
| Schlumberger Technology Corporation | 10673 |
3 |
| Bly IP Inc. | 31 |
3 |
| Diaset Products Ltd. | 8 |
3 |
| Flexidrill Limited | 46 |
3 |
| Les Entreprises Parlec Ltee | 3 |
3 |
| Swick Mining Services Ltd | 13 |
3 |
| Heilongjiang Institute of Geological Sciences | 3 |
3 |
| Boyles Bros Diamantina S.A. | 3 |
3 |
| Institute of Exploration Techniques, Chinese Academy of Geological Sciences | 5 |
3 |
| Other owners | 49 |