- 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 43/02 - Subsoil filtering
Patent holdings for IPC class E21B 43/02
Total number of patents in this class: 374
10-year publication summary
|
34
|
36
|
35
|
16
|
20
|
15
|
18
|
17
|
6
|
3
|
| 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | 2025 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| Halliburton Energy Services, Inc. | 20769 |
88 |
| Schlumberger Technology Corporation | 10641 |
22 |
| Saudi Arabian Oil Company | 12891 |
20 |
| Baker Hughes Incorporated | 5281 |
19 |
| Schlumberger Canada Limited | 7244 |
18 |
| Schlumberger Technology B.v. | 5154 |
16 |
| Services Petroliers Schlumberger | 5763 |
16 |
| Baker Hughes, a GE Company, LLC | 2114 |
11 |
| Schlumberger Holdings Limited | 2840 |
9 |
| Prad Research and Development Limited | 2693 |
9 |
| Baker Hughes Holdings LLC | 3006 |
8 |
| The Lubrizol Corporation | 1283 |
7 |
| Halliburton Manufacturing and Services Limited | 58 |
6 |
| M-I L.L.C. | 815 |
6 |
| Aramco Services Company | 3921 |
5 |
| Weatherford Technology Holdings, LLC | 2012 |
4 |
| SC Asset Corporation | 47 |
4 |
| Cleansorb Limited | 31 |
3 |
| ExxonMobil Upstream Research Company | 2411 |
3 |
| Guangzhou Institute of Energy Conversion, Chinese Academy of Sciences | 232 |
3 |
| Other owners | 97 |