- 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 47/11 - Locating fluid leaks, intrusions or movements using tracersLocating fluid leaks, intrusions or movements using radioactivity
Patent holdings for IPC class E21B 47/11
Total number of patents in this class: 440
10-year publication summary
|
9
|
6
|
13
|
29
|
37
|
52
|
56
|
55
|
55
|
51
|
| 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | 2025 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| Saudi Arabian Oil Company | 13224 |
92 |
| Resman AS | 74 |
38 |
| Halliburton Energy Services, Inc. | 20911 |
26 |
| Aramco Services Company | 3987 |
24 |
| CARBO Ceramics Inc. | 235 |
21 |
| Schlumberger Technology Corporation | 10780 |
16 |
| Chevron U.S.A. Inc. | 3967 |
15 |
| ExxonMobil Upstream Research Company | 2396 |
10 |
| BP Corporation North America Inc. | 746 |
8 |
| Tracerco Limited | 90 |
8 |
| Baker Hughes Oilfield Operations, LLC | 2302 |
7 |
| Exedra AS | 7 |
7 |
| Johnson Matthey Public Limited Company | 1866 |
6 |
| NCS Multistage Inc. | 177 |
6 |
| Silverwell Technology Ltd | 29 |
6 |
| ConocoPhillips Company | 1675 |
5 |
| Schlumberger Canada Limited | 7332 |
4 |
| Core Laboratories LP | 32 |
4 |
| NCS Multistage, LLC | 71 |
4 |
| Scale Protection AS | 10 |
4 |
| Other owners | 129 |