- 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: 584
10-year publication summary
|
25
|
30
|
31
|
38
|
72
|
55
|
63
|
59
|
71
|
49
|
| 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | 2025 | 2026 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| Halliburton Energy Services, Inc. | 21296 |
202 |
| Schlumberger Technology Corporation | 11981 |
71 |
| Baker Hughes Oilfield Operations, LLC | 2558 |
41 |
| Saudi Arabian Oil Company | 14398 |
29 |
| Schlumberger Canada Limited | 7621 |
27 |
| Services Petroliers Schlumberger | 6029 |
22 |
| Schlumberger Technology B.v. | 5292 |
19 |
| William Marsh Rice University | 1082 |
8 |
| Southwest Petroleum University | 530 |
7 |
| Statoil Petroleum AS | 468 |
6 |
| Chevron U.S.A. Inc. | 4180 |
5 |
| ConocoPhillips Company | 1717 |
5 |
| Expro North Sea Limited | 230 |
5 |
| Archer Oiltools AS | 47 |
5 |
| Landmark Graphics Corporation | 1485 |
4 |
| Weatherford Technology Holdings, LLC | 2168 |
4 |
| Equinor Energy AS | 499 |
4 |
| Triad National Security, LLC | 636 |
4 |
| Case360 Limited | 9 |
4 |
| Aramco Services Company | 4190 |
3 |
| Other owners | 109 |