- 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: 531
10-year publication summary
|
54
|
67
|
61
|
42
|
33
|
24
|
30
|
37
|
46
|
23
|
| 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | 2025 | 2026 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| Halliburton Energy Services, Inc. | 21284 |
74 |
| Saudi Arabian Oil Company | 14349 |
55 |
| Schlumberger Technology Corporation | 11924 |
23 |
| Baker Hughes Incorporated | 4897 |
20 |
| Dorf Ketal Chemicals FZE | 196 |
18 |
| Championx LLC | 653 |
17 |
| Schlumberger Canada Limited | 7621 |
13 |
| Cameron International Corporation | 1367 |
13 |
| King Fahd University of Petroleum and Minerals | 1598 |
13 |
| Baker Hughes, a GE Company, LLC | 2048 |
12 |
| Metrol Technology Limited | 89 |
11 |
| Aramco Services Company | 4192 |
10 |
| Baker Hughes Holdings LLC | 3011 |
10 |
| ExxonMobil Upstream Research Company | 2288 |
8 |
| Services Petroliers Schlumberger | 6033 |
8 |
| Schlumberger Technology B.v. | 5299 |
7 |
| Chevron U.S.A. Inc. | 4166 |
7 |
| China National Petroleum Corporation | 643 |
6 |
| Fluid Energy Group Ltd. | 58 |
6 |
| Ecolab USA Inc. | 5826 |
5 |
| Other owners | 195 |