- 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 47/11 - Locating fluid leaks, intrusions or movements using radioactivity
Patent holdings for IPC class E21B 47/11
Total number of patents in this class: 336
10-year publication summary
|
9
|
13
|
7
|
15
|
31
|
37
|
62
|
61
|
58
|
16
|
| 2015 | 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| Saudi Arabian Oil Company | 11322 |
60 |
| Halliburton Energy Services, Inc. | 20165 |
24 |
| Resman AS | 54 |
21 |
| CARBO Ceramics Inc. | 248 |
19 |
| Aramco Services Company | 3504 |
15 |
| Schlumberger Technology Corporation | 9690 |
12 |
| Chevron U.S.A. Inc. | 3774 |
10 |
| ExxonMobil Upstream Research Company | 2525 |
10 |
| BP Corporation North America Inc. | 776 |
8 |
| Exedra AS | 7 |
7 |
| Tracerco Limited | 76 |
7 |
| Johnson Matthey Public Limited Company | 1852 |
6 |
| ConocoPhillips Company | 1657 |
5 |
| Silverwell Technology Ltd | 23 |
5 |
| Core Laboratories LP | 29 |
4 |
| NCS Multistage Inc. | 172 |
4 |
| NCS Multistage, LLC | 76 |
4 |
| Scale Protection AS | 10 |
4 |
| Baker Hughes Oilfield Operations, LLC | 1885 |
4 |
| Baker Hughes, a GE Company, LLC | 2171 |
4 |
| Other owners | 103 |