- 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 47/005 - Monitoring or checking of cementation quality or level
Patent holdings for IPC class E21B 47/005
Total number of patents in this class: 452
10-year publication summary
|
33
|
25
|
30
|
31
|
38
|
72
|
54
|
60
|
54
|
0
|
| 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | 2025 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| Halliburton Energy Services, Inc. | 20403 |
145 |
| Schlumberger Technology Corporation | 10217 |
52 |
| Baker Hughes Oilfield Operations, LLC | 2105 |
28 |
| Saudi Arabian Oil Company | 12390 |
26 |
| Schlumberger Canada Limited | 7137 |
20 |
| Services Petroliers Schlumberger | 5616 |
16 |
| Schlumberger Technology B.v. | 5058 |
15 |
| ConocoPhillips Company | 1676 |
10 |
| William Marsh Rice University | 971 |
8 |
| Statoil Petroleum AS | 541 |
7 |
| Southwest Petroleum University | 442 |
5 |
| Landmark Graphics Corporation | 1521 |
4 |
| Chevron U.S.A. Inc. | 3844 |
4 |
| Expro North Sea Limited | 228 |
4 |
| Pipelines 2 Data (p2d) Limited | 17 |
4 |
| Equinor Energy AS | 485 |
4 |
| Aramco Services Company | 3735 |
3 |
| CARBO Ceramics Inc. | 246 |
3 |
| GOWell International, LLC | 15 |
3 |
| Probe Technology Services, Inc. | 34 |
3 |
| Other owners | 88 |