- 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 4/04 - Electric drives
Patent holdings for IPC class E21B 4/04
Total number of patents in this class: 311
10-year publication summary
|
29
|
13
|
10
|
22
|
22
|
17
|
23
|
19
|
18
|
14
|
| 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | 2025 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| Halliburton Energy Services, Inc. | 21019 |
96 |
| Schlumberger Technology Corporation | 10976 |
16 |
| Welltec AS | 300 |
14 |
| Baker Hughes Oilfield Operations, LLC | 2368 |
12 |
| Upwing Energy, Inc. | 51 |
12 |
| Schlumberger Technology B.v. | 5206 |
10 |
| Schlumberger Canada Limited | 7408 |
9 |
| Services Petroliers Schlumberger | 5857 |
9 |
| Schlumberger Holdings Limited | 2795 |
6 |
| Baker Hughes Incorporated | 5230 |
5 |
| Prad Research and Development Limited | 2688 |
5 |
| Saudi Arabian Oil Company | 13540 |
5 |
| ExxonMobil Upstream Research Company | 2384 |
4 |
| SDG, LLC | 57 |
4 |
| Accessesp UK Limited | 29 |
3 |
| ConocoPhillips Company | 1682 |
3 |
| Norwegian Hard Rock Drilling AS | 8 |
3 |
| Baker Hughes, a GE Company, LLC | 2107 |
3 |
| Baker Hughes Holdings LLC | 3009 |
3 |
| Smith International, Inc. | 715 |
2 |
| Other owners | 87 |