- 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 43/18 - Repressuring or vacuum methods
Patent holdings for IPC class E21B 43/18
Total number of patents in this class: 154
10-year publication summary
|
7
|
10
|
11
|
6
|
6
|
9
|
3
|
3
|
3
|
4
|
| 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | 2025 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| Saudi Arabian Oil Company | 13372 |
11 |
| SunCor Energy Inc. | 744 |
7 |
| Aramco Services Company | 4025 |
6 |
| Cenovus Energy Inc. | 419 |
6 |
| Landmark Graphics Corporation | 1523 |
5 |
| Halliburton Energy Services, Inc. | 20946 |
4 |
| Chevron U.S.A. Inc. | 3992 |
4 |
| Nexen Energy ULC | 43 |
4 |
| Schlumberger Technology Corporation | 10881 |
3 |
| Schlumberger Canada Limited | 7366 |
3 |
| Schlumberger Technology B.v. | 5183 |
3 |
| Schlumberger Holdings Limited | 2803 |
3 |
| Ior Canada Ltd. | 15 |
3 |
| Lifteck International Inc. | 3 |
3 |
| Prad Research and Development Limited | 2692 |
3 |
| Services Petroliers Schlumberger | 5828 |
3 |
| Borehole Seismic, LLC. | 10 |
3 |
| 1849161 Alberta Ltd. | 3 |
3 |
| Baker Hughes Incorporated | 5248 |
2 |
| Weatherford Technology Holdings, LLC | 2029 |
2 |
| Other owners | 73 |