- 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: 786
10-year publication summary
|
3
|
17
|
33
|
37
|
120
|
107
|
86
|
81
|
83
|
28
|
| 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | 2025 | 2026 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| Halliburton Energy Services, Inc. | 21257 |
172 |
| Saudi Arabian Oil Company | 13956 |
102 |
| Schlumberger Technology Corporation | 11584 |
76 |
| Schlumberger Canada Limited | 7588 |
48 |
| Services Petroliers Schlumberger | 5996 |
39 |
| Schlumberger Technology B.v. | 5282 |
32 |
| Darkvision Technologies Inc. | 86 |
26 |
| Aramco Services Company | 4162 |
15 |
| Baker Hughes Oilfield Operations, LLC | 2480 |
15 |
| e.V. Offshore Limited | 67 |
14 |
| Landmark Graphics Corporation | 1508 |
9 |
| Baker Hughes Incorporated | 5018 |
8 |
| Geoquest Systems B.V. | 856 |
7 |
| Schlumberger Holdings Limited | 2724 |
6 |
| China University of Mining and Technology | 1295 |
6 |
| Petroleo Brasileiro S.A. - Petrobras | 947 |
6 |
| Prad Research and Development Limited | 2678 |
6 |
| ConocoPhillips Company | 1697 |
5 |
| Motive Drilling Technologies, Inc. | 103 |
5 |
| Visuray Technology Ltd | 23 |
5 |
| Other owners | 184 |