- 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 47/002 - Survey of boreholes or wells by visual inspection
Patent holdings for IPC class E21B 47/002
Total number of patents in this class: 714
10-year publication summary
|
17
|
2
|
15
|
31
|
31
|
115
|
98
|
80
|
75
|
54
|
| 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | 2025 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| Halliburton Energy Services, Inc. | 20911 |
164 |
| Saudi Arabian Oil Company | 13224 |
90 |
| Schlumberger Technology Corporation | 10780 |
59 |
| Schlumberger Canada Limited | 7332 |
42 |
| Services Petroliers Schlumberger | 5803 |
36 |
| Schlumberger Technology B.v. | 5176 |
31 |
| Darkvision Technologies Inc. | 82 |
25 |
| e.V. Offshore Limited | 62 |
14 |
| Baker Hughes Oilfield Operations, LLC | 2302 |
14 |
| Aramco Services Company | 3987 |
12 |
| Baker Hughes Incorporated | 5274 |
8 |
| Landmark Graphics Corporation | 1527 |
8 |
| Visuray Intech Ltd (BVI) | 25 |
7 |
| Schlumberger Holdings Limited | 2817 |
6 |
| China University of Mining and Technology | 1256 |
6 |
| Petroleo Brasileiro S.A. - Petrobras | 855 |
6 |
| Prad Research and Development Limited | 2693 |
6 |
| ConocoPhillips Company | 1675 |
5 |
| Geoquest Systems B.V. | 754 |
5 |
| Motive Drilling Technologies, Inc. | 103 |
5 |
| Other owners | 165 |