- 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 25/08 - Coating, freezing, consolidating coresRecovering uncontaminated cores or cores at formation pressure
Patent holdings for IPC class E21B 25/08
Total number of patents in this class: 78
10-year publication summary
|
5
|
8
|
12
|
5
|
4
|
9
|
1
|
1
|
3
|
4
|
| 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | 2025 | 2026 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| Saudi Arabian Oil Company | 14329 |
14 |
| Halliburton Energy Services, Inc. | 21296 |
7 |
| Aramco Services Company | 4192 |
5 |
| Shenzhen University | 1731 |
5 |
| Baker Hughes Incorporated | 4903 |
4 |
| Sichuan University | 628 |
4 |
| Chevron U.S.A. Inc. | 4162 |
3 |
| China National Petroleum Corporation | 642 |
3 |
| Corsyde International GmbH & Co. KG | 3 |
3 |
| Coreall AS | 11 |
2 |
| National Oilwell Varco, L.P. | 1700 |
2 |
| Anadolu Universitesi Rektorlugu | 16 |
2 |
| Guangzhou Marine Geological Survey | 18 |
2 |
| Lybroco Inc. | 2 |
2 |
| CNPC Greatwall Drilling Company | 14 |
2 |
| Q2 Artificial Lift Services LLC | 17 |
2 |
| Schlumberger Technology Corporation | 11893 |
1 |
| The Regents of the University of Michigan | 5023 |
1 |
| Boehringer Ingelheim microParts GmbH | 65 |
1 |
| Cenovus Energy Inc. | 425 |
1 |
| Other owners | 12 |