- 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 47/047 - Liquid level
Patent holdings for IPC class E21B 47/047
Total number of patents in this class: 164
10-year publication summary
|
4
|
2
|
4
|
7
|
12
|
24
|
25
|
23
|
23
|
10
|
| 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | 2025 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| Saudi Arabian Oil Company | 13656 |
27 |
| Schlumberger Technology Corporation | 11054 |
12 |
| Halliburton Energy Services, Inc. | 21078 |
10 |
| Motive Drilling Technologies, Inc. | 103 |
8 |
| ExxonMobil Upstream Research Company | 2379 |
6 |
| Aramco Services Company | 4095 |
5 |
| Reservoir Management Services, LLC | 9 |
5 |
| Welldata (Subsurface Surveillance Systems) Ltd. | 8 |
5 |
| Schlumberger Canada Limited | 7432 |
3 |
| PetroChina Company Limited | 725 |
3 |
| Orica International Pte Ltd | 185 |
3 |
| 9380-1934 Quebec Inc. | 10 |
3 |
| Baker Hughes Incorporated | 5175 |
2 |
| Landmark Graphics Corporation | 1515 |
2 |
| China Oilfield Services Limited | 90 |
2 |
| Dyno Nobel Asia Pacific Pty Limited | 43 |
2 |
| Enhanced Drilling AS | 44 |
2 |
| Q.E.D. Environmental Systems, Inc. | 89 |
2 |
| Services Petroliers Schlumberger | 5884 |
2 |
| SunCor Energy Inc. | 746 |
2 |
| Other owners | 58 |