- 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: 72
10-year publication summary
|
2
|
5
|
8
|
12
|
5
|
4
|
9
|
1
|
1
|
2
|
| 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | 2025 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| Saudi Arabian Oil Company | 12911 |
15 |
| Halliburton Energy Services, Inc. | 20788 |
7 |
| Aramco Services Company | 3927 |
5 |
| Shenzhen University | 1636 |
5 |
| Baker Hughes Incorporated | 5279 |
4 |
| Sichuan University | 562 |
4 |
| Corsyde International GmbH & Co. KG | 3 |
3 |
| Chevron U.S.A. Inc. | 3939 |
2 |
| Coreall AS | 11 |
2 |
| National Oilwell Varco, L.P. | 1661 |
2 |
| Anadolu Universitesi Rektorlugu | 16 |
2 |
| Guangzhou Marine Geological Survey | 18 |
2 |
| Lybroco Inc. | 2 |
2 |
| Schlumberger Technology Corporation | 10652 |
1 |
| The Regents of the University of Michigan | 4675 |
1 |
| Boehringer Ingelheim microParts GmbH | 75 |
1 |
| Cenovus Energy Inc. | 422 |
1 |
| China National Petroleum Corporation | 430 |
1 |
| Colorado State University Research Foundation | 702 |
1 |
| Greatwall Drilling Company | 1 |
1 |
| Other owners | 10 |