- 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 47/047 - Liquid level
Patent holdings for IPC class E21B 47/047
Total number of patents in this class: 136
10-year publication summary
5
|
6
|
4
|
5
|
9
|
12
|
23
|
25
|
23
|
9
|
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 |
23 |
Halliburton Energy Services, Inc. | 20165 |
9 |
Schlumberger Technology Corporation | 9690 |
7 |
ExxonMobil Upstream Research Company | 2525 |
6 |
Reservoir Management Services, LLC | 9 |
5 |
Welldata (Subsurface Surveillance Systems) Ltd. | 8 |
5 |
Motive Drilling Technologies, Inc. | 89 |
4 |
Aramco Services Company | 3504 |
3 |
PetroChina Company Limited | 462 |
3 |
Schlumberger Canada Limited | 6913 |
2 |
Baker Hughes Incorporated | 5689 |
2 |
Landmark Graphics Corporation | 1526 |
2 |
China Oilfield Services Limited | 79 |
2 |
Enhanced Drilling AS | 36 |
2 |
Q.E.D. Environmental Systems, Inc. | 86 |
2 |
Services Petroliers Schlumberger | 5426 |
2 |
SunCor Energy Inc. | 838 |
2 |
Wellgauge, Inc. | 4 |
2 |
Unico, LLC | 75 |
2 |
AquaSwift Inc. | 3 |
2 |
Other owners | 49 |