- 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 41/02 - Equipment or details not covered by groups in situ inhibition of corrosion in boreholes or wells
Patent holdings for IPC class E21B 41/02
Total number of patents in this class: 520
10-year publication summary
|
48
|
53
|
50
|
37
|
29
|
23
|
27
|
32
|
40
|
6
|
| 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | 2025 | 2026 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| Halliburton Energy Services, Inc. | 21153 |
76 |
| Saudi Arabian Oil Company | 13921 |
51 |
| Schlumberger Technology Corporation | 11404 |
22 |
| Baker Hughes Incorporated | 5082 |
20 |
| Dorf Ketal Chemicals FZE | 202 |
18 |
| Schlumberger Canada Limited | 7550 |
13 |
| Cameron International Corporation | 1361 |
13 |
| King Fahd University of Petroleum and Minerals | 1454 |
12 |
| Baker Hughes, a GE Company, LLC | 2103 |
12 |
| Metrol Technology Limited | 85 |
11 |
| Baker Hughes Holdings LLC | 2981 |
11 |
| Championx LLC | 588 |
11 |
| Aramco Services Company | 4164 |
10 |
| ExxonMobil Upstream Research Company | 2347 |
8 |
| Services Petroliers Schlumberger | 5966 |
8 |
| Schlumberger Technology B.v. | 5263 |
7 |
| Ecolab USA Inc. | 5700 |
6 |
| Chevron U.S.A. Inc. | 4075 |
5 |
| China National Petroleum Corporation | 514 |
5 |
| Fluid Energy Group Ltd. | 58 |
5 |
| Other owners | 196 |