- 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: 773
10-year publication summary
|
2
|
15
|
31
|
31
|
115
|
99
|
81
|
77
|
79
|
14
|
| 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | 2025 | 2026 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| Halliburton Energy Services, Inc. | 21151 |
166 |
| Saudi Arabian Oil Company | 13931 |
102 |
| Schlumberger Technology Corporation | 11423 |
74 |
| Schlumberger Canada Limited | 7552 |
48 |
| Services Petroliers Schlumberger | 5969 |
39 |
| Schlumberger Technology B.v. | 5265 |
32 |
| Darkvision Technologies Inc. | 87 |
26 |
| Aramco Services Company | 4167 |
16 |
| e.V. Offshore Limited | 65 |
14 |
| Baker Hughes Oilfield Operations, LLC | 2427 |
14 |
| Baker Hughes Incorporated | 5075 |
8 |
| Landmark Graphics Corporation | 1511 |
8 |
| Geoquest Systems B.V. | 839 |
7 |
| Schlumberger Holdings Limited | 2747 |
6 |
| China University of Mining and Technology | 1289 |
6 |
| Petroleo Brasileiro S.A. - Petrobras | 924 |
6 |
| Prad Research and Development Limited | 2680 |
6 |
| ConocoPhillips Company | 1701 |
5 |
| Motive Drilling Technologies, Inc. | 103 |
5 |
| Visuray Technology Ltd | 23 |
5 |
| Other owners | 180 |