- 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 25/06 - Apparatus for obtaining or removing undisturbed cores, e.g. core barrels or core extractors the core receiver having a flexible liner or inflatable retaining means
Patent holdings for IPC class E21B 25/06
Total number of patents in this class: 31
10-year publication summary
|
4
|
3
|
3
|
3
|
3
|
2
|
3
|
0
|
1
|
0
|
| 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | 2025 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| Halliburton Energy Services, Inc. | 20871 |
6 |
| National Oilwell Varco, L.P. | 1668 |
4 |
| Saudi Arabian Oil Company | 13044 |
4 |
| Shenzhen University | 1638 |
2 |
| Sichuan University | 564 |
2 |
| Baker Hughes, a GE Company, LLC | 2112 |
2 |
| Baker Hughes Incorporated | 5268 |
1 |
| Benthic GeoTech, Pty Ltd | 6 |
1 |
| Colorado State University Research Foundation | 704 |
1 |
| Swick Mining Services Ltd | 13 |
1 |
| Hunan University of Science and Technology | 66 |
1 |
| Richard C. Rogers | 1 |
1 |
| Richard L. Johnson | 1 |
1 |
| Benthic USA LLC | 6 |
1 |
| Scope Engineering (WA) Pty Ltd | 1 |
1 |
| BTR Bohrtechnik Rosswag GmbH & Co.KG | 1 |
1 |
| Lybroco Inc. | 2 |
1 |
| Other owners | 0 |