- 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 43/08 - Screens or liners
Patent holdings for IPC class E21B 43/08
Total number of patents in this class: 1827
10-year publication summary
|
133
|
138
|
138
|
130
|
110
|
98
|
94
|
63
|
56
|
37
|
| 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | 2025 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| Halliburton Energy Services, Inc. | 21020 |
454 |
| Baker Hughes Incorporated | 5233 |
132 |
| Schlumberger Technology Corporation | 10957 |
131 |
| Schlumberger Canada Limited | 7403 |
80 |
| Baker Hughes, a GE Company, LLC | 2108 |
72 |
| Schlumberger Technology B.v. | 5203 |
67 |
| Services Petroliers Schlumberger | 5852 |
67 |
| Saudi Arabian Oil Company | 13512 |
59 |
| Baker Hughes Oilfield Operations, LLC | 2360 |
59 |
| ExxonMobil Upstream Research Company | 2386 |
50 |
| Weatherford Technology Holdings, LLC | 2036 |
38 |
| Schlumberger Holdings Limited | 2796 |
27 |
| Prad Research and Development Limited | 2688 |
25 |
| Baker Hughes Holdings LLC | 3010 |
22 |
| 3m Innovative Properties Company | 17749 |
17 |
| Halliburton Manufacturing and Services Limited | 58 |
16 |
| M-I L.L.C. | 808 |
16 |
| Chevron U.S.A. Inc. | 4014 |
15 |
| Floway Innovations Inc. | 14 |
14 |
| Aramco Services Company | 4058 |
11 |
| Other owners | 455 |