- 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: 684
10-year publication summary
|
23
|
3
|
17
|
33
|
37
|
120
|
105
|
87
|
76
|
35
|
| 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | 2025 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| Halliburton Energy Services, Inc. | 20749 |
157 |
| Saudi Arabian Oil Company | 12858 |
86 |
| Schlumberger Technology Corporation | 10627 |
55 |
| Schlumberger Canada Limited | 7235 |
39 |
| Services Petroliers Schlumberger | 5756 |
33 |
| Schlumberger Technology B.v. | 5148 |
30 |
| Darkvision Technologies Inc. | 81 |
25 |
| e.V. Offshore Limited | 62 |
14 |
| Baker Hughes Oilfield Operations, LLC | 2269 |
14 |
| Aramco Services Company | 3910 |
12 |
| Baker Hughes Incorporated | 5289 |
8 |
| Landmark Graphics Corporation | 1522 |
8 |
| Visuray Intech Ltd (BVI) | 25 |
7 |
| Schlumberger Holdings Limited | 2841 |
6 |
| China University of Mining and Technology | 1244 |
6 |
| Petroleo Brasileiro S.A. - Petrobras | 824 |
6 |
| Prad Research and Development Limited | 2694 |
6 |
| ConocoPhillips Company | 1676 |
5 |
| Motive Drilling Technologies, Inc. | 102 |
5 |
| Intelligent Wellhead Systems Inc. | 82 |
5 |
| Other owners | 157 |