- 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 4/18 - Anchoring or feeding in the borehole
Patent holdings for IPC class E21B 4/18
Total number of patents in this class: 294
10-year publication summary
|
16
|
11
|
16
|
11
|
14
|
6
|
8
|
11
|
11
|
4
|
| 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | 2025 | 2026 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| Halliburton Energy Services, Inc. | 21144 |
24 |
| Welltec AS | 303 |
16 |
| WWT North America Holdings, Inc. | 55 |
14 |
| Schlumberger Canada Limited | 7524 |
13 |
| Schlumberger Technology B.v. | 5259 |
12 |
| Schlumberger Holdings Limited | 2753 |
12 |
| Saudi Arabian Oil Company | 13904 |
12 |
| Services Petroliers Schlumberger | 5945 |
12 |
| Schlumberger Technology Corporation | 11349 |
11 |
| Prad Research and Development Limited | 2683 |
10 |
| Well Conveyor AS | 13 |
8 |
| Thru Tubing Solutions, Inc. | 390 |
7 |
| Aramco Services Company | 4158 |
6 |
| GA Drilling, a. s. | 22 |
6 |
| GE Infrastructure Technology, LLC | 6209 |
5 |
| Altus Intervention (technologies) AS | 68 |
5 |
| Weatherford Technology Holdings, LLC | 2040 |
4 |
| C6 Technologies AS | 33 |
4 |
| Herrenknecht AG | 210 |
4 |
| Western Well Tool, Inc. | 10 |
4 |
| Other owners | 105 |