- All sections
- E - Fixed constructions
- E21B - Earth or rock drilling; obtaining 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: 545
10-year publication summary
|
28
|
23
|
3
|
14
|
32
|
37
|
120
|
105
|
78
|
15
|
| 2015 | 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| Halliburton Energy Services, Inc. | 20165 |
130 |
| Saudi Arabian Oil Company | 11322 |
68 |
| Schlumberger Technology Corporation | 9690 |
38 |
| Schlumberger Canada Limited | 6913 |
26 |
| Services Petroliers Schlumberger | 5426 |
22 |
| Schlumberger Technology B.v. | 4951 |
20 |
| Darkvision Technologies Inc. | 61 |
20 |
| Aramco Services Company | 3504 |
12 |
| e.V. Offshore Limited | 59 |
12 |
| Baker Hughes Oilfield Operations, LLC | 1885 |
12 |
| Baker Hughes Incorporated | 5689 |
8 |
| Landmark Graphics Corporation | 1526 |
7 |
| Schlumberger Holdings Limited | 2947 |
6 |
| Prad Research and Development Limited | 2696 |
6 |
| Chevron U.S.A. Inc. | 3774 |
5 |
| China University of Mining and Technology | 1189 |
5 |
| ConocoPhillips Company | 1657 |
5 |
| Visuray Intech Ltd (BVI) | 25 |
4 |
| Intelligent Wellhead Systems Inc. | 77 |
4 |
| Baker Hughes, a GE Company, LLC | 2171 |
4 |
| Other owners | 131 |