- 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: 406
10-year publication summary
|
10
|
33
|
25
|
29
|
31
|
38
|
72
|
54
|
60
|
21
|
| 2015 | 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| Halliburton Energy Services, Inc. | 20165 |
132 |
| Schlumberger Technology Corporation | 9690 |
43 |
| Baker Hughes Oilfield Operations, LLC | 1885 |
26 |
| Saudi Arabian Oil Company | 11322 |
24 |
| Schlumberger Canada Limited | 6913 |
16 |
| Services Petroliers Schlumberger | 5426 |
12 |
| Schlumberger Technology B.v. | 4951 |
11 |
| ConocoPhillips Company | 1657 |
9 |
| William Marsh Rice University | 937 |
8 |
| Statoil Petroleum AS | 555 |
7 |
| Landmark Graphics Corporation | 1526 |
4 |
| Chevron U.S.A. Inc. | 3774 |
4 |
| Pipelines 2 Data (p2d) Limited | 17 |
4 |
| Southwest Petroleum University | 403 |
4 |
| Equinor Energy AS | 475 |
4 |
| Aramco Services Company | 3504 |
3 |
| CARBO Ceramics Inc. | 248 |
3 |
| GOWell International, LLC | 13 |
3 |
| Probe Technology Services, Inc. | 33 |
3 |
| Deltatek Oil Tools Limited | 23 |
3 |
| Other owners | 83 |