- 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 47/005 - Monitoring or checking of cementation quality or level
Patent holdings for IPC class E21B 47/005
Total number of patents in this class: 467
10-year publication summary
|
33
|
25
|
30
|
31
|
38
|
72
|
54
|
61
|
53
|
24
|
| 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | 2025 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| Halliburton Energy Services, Inc. | 20649 |
150 |
| Schlumberger Technology Corporation | 10530 |
58 |
| Baker Hughes Oilfield Operations, LLC | 2218 |
32 |
| Saudi Arabian Oil Company | 12711 |
26 |
| Schlumberger Canada Limited | 7163 |
20 |
| Services Petroliers Schlumberger | 5715 |
17 |
| Schlumberger Technology B.v. | 5122 |
15 |
| ConocoPhillips Company | 1668 |
9 |
| William Marsh Rice University | 996 |
8 |
| Statoil Petroleum AS | 519 |
7 |
| Southwest Petroleum University | 456 |
5 |
| Landmark Graphics Corporation | 1517 |
4 |
| Chevron U.S.A. Inc. | 3901 |
4 |
| Expro North Sea Limited | 224 |
4 |
| Pipelines 2 Data (p2d) Limited | 18 |
4 |
| Equinor Energy AS | 481 |
4 |
| Weatherford Technology Holdings, LLC | 2011 |
3 |
| Aramco Services Company | 3885 |
3 |
| CARBO Ceramics Inc. | 237 |
3 |
| Probe Technology Services, Inc. | 34 |
3 |
| Other owners | 88 |