- 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 25/00 - Apparatus for obtaining or removing undisturbed cores, e.g. core barrels or core extractors
Patent holdings for IPC class E21B 25/00
Total number of patents in this class: 462
10-year publication summary
|
34
|
41
|
21
|
48
|
33
|
42
|
25
|
11
|
19
|
9
|
| 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | 2025 | 2026 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| Saudi Arabian Oil Company | 13953 |
33 |
| Baker Hughes Incorporated | 5026 |
30 |
| Shenzhen University | 1711 |
30 |
| Halliburton Energy Services, Inc. | 21247 |
29 |
| Sichuan University | 617 |
28 |
| Schlumberger Technology Corporation | 11574 |
12 |
| Aramco Services Company | 4161 |
10 |
| Reflex Instruments Asia Pacific Pty Ltd | 88 |
9 |
| Boart Longyear Manufacturing and Distribution Inc. | 128 |
9 |
| Flexidrill Limited | 39 |
7 |
| National Oilwell Varco, L.P. | 1689 |
7 |
| Chevron U.S.A. Inc. | 4109 |
6 |
| Minalyze AB | 8 |
6 |
| Prospectors IP Holdings Pty Ltd | 11 |
6 |
| Baker Hughes, a GE Company, LLC | 2092 |
6 |
| Schlumberger Canada Limited | 7590 |
5 |
| Epiroc Canada Inc. | 19 |
5 |
| Veracio Ltd. | 73 |
5 |
| Schlumberger Technology B.v. | 5285 |
4 |
| BP Exploration Operating Company Limited | 260 |
4 |
| Other owners | 211 |