- 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: 296
10-year publication summary
|
19
|
16
|
11
|
16
|
11
|
14
|
6
|
8
|
11
|
6
|
| 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | 2025 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| Halliburton Energy Services, Inc. | 20911 |
26 |
| Welltec AS | 298 |
16 |
| WWT North America Holdings, Inc. | 56 |
15 |
| Schlumberger Canada Limited | 7332 |
14 |
| Schlumberger Technology B.v. | 5176 |
13 |
| Schlumberger Holdings Limited | 2817 |
13 |
| Services Petroliers Schlumberger | 5803 |
13 |
| Schlumberger Technology Corporation | 10780 |
12 |
| Saudi Arabian Oil Company | 13224 |
12 |
| Prad Research and Development Limited | 2693 |
10 |
| Well Conveyor AS | 13 |
8 |
| Thru Tubing Solutions, Inc. | 379 |
7 |
| Aramco Services Company | 3987 |
6 |
| Altus Intervention (technologies) AS | 66 |
5 |
| C6 Technologies AS | 33 |
4 |
| Western Well Tool, Inc. | 10 |
4 |
| Baker Hughes Incorporated | 5274 |
3 |
| Weatherford Technology Holdings, LLC | 2023 |
3 |
| Aarbakke Innovation A.S. | 29 |
3 |
| Aker Well Service AS | 21 |
3 |
| Other owners | 106 |