- 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 25/18 - Apparatus for obtaining or removing undisturbed cores, e.g. core barrels or core extractors the core receiver being specially adapted for operation under water
Patent holdings for IPC class E21B 25/18
Total number of patents in this class: 51
10-year publication summary
|
3
|
1
|
7
|
10
|
6
|
4
|
2
|
2
|
0
|
0
|
| 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | 2025 | 2026 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| Hunan University of Science and Technology | 68 |
6 |
| Bauer Maschinen GmbH | 235 |
5 |
| Guangzhou Marine Geological Survey | 18 |
4 |
| Benthic USA LLC | 6 |
3 |
| Hunan Sea Bull Geological Exploration Co.,Ltd | 3 |
3 |
| Japan Agency for Marine-Earth Science and Technology | 172 |
2 |
| MARL Technologies Inc. | 11 |
2 |
| Natural Environment Research Council | 13 |
2 |
| Shenzhen University | 1691 |
2 |
| Topy Kogyo Kabushiki Kaisha | 112 |
2 |
| Shell Internationale Research Maatschappij B.V. | 3487 |
1 |
| Centre National de La Recherche Scientifique | 10855 |
1 |
| Benthic GeoTech, Pty Ltd | 6 |
1 |
| Dalian University of Technology | 1570 |
1 |
| ExxonMobil Upstream Research Company | 2345 |
1 |
| Fugro Engineers B.V. | 7 |
1 |
| Fugro Technology B.V. | 41 |
1 |
| Hangzhou Dianzi University | 105 |
1 |
| Korea Institute of Geoscience and Mineral Resources | 241 |
1 |
| Marl Technologies | 1 |
1 |
| Other owners | 10 |