- 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 43/12 - Methods or apparatus for controlling the flow of the obtained fluid to or in wells
Patent holdings for IPC class E21B 43/12
Total number of patents in this class: 8426
10-year publication summary
|
576
|
510
|
531
|
506
|
525
|
590
|
487
|
425
|
470
|
432
|
| 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | 2025 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| Halliburton Energy Services, Inc. | 21078 |
1258 |
| Saudi Arabian Oil Company | 13656 |
570 |
| Schlumberger Technology Corporation | 11054 |
522 |
| Schlumberger Canada Limited | 7432 |
405 |
| Services Petroliers Schlumberger | 5884 |
341 |
| Schlumberger Technology B.v. | 5223 |
309 |
| Baker Hughes Oilfield Operations, LLC | 2390 |
299 |
| Baker Hughes Incorporated | 5175 |
264 |
| Aramco Services Company | 4095 |
164 |
| Weatherford Technology Holdings, LLC | 2033 |
142 |
| Baker Hughes, a GE Company, LLC | 2106 |
131 |
| Baker Hughes Holdings LLC | 3002 |
119 |
| ExxonMobil Upstream Research Company | 2379 |
99 |
| Schlumberger Holdings Limited | 2790 |
96 |
| Prad Research and Development Limited | 2687 |
96 |
| Landmark Graphics Corporation | 1515 |
65 |
| NCS Multistage Inc. | 181 |
65 |
| Flowco Production Solutions, LLC | 65 |
53 |
| Chevron U.S.A. Inc. | 4018 |
48 |
| Petroleum Technology Company AS | 98 |
46 |
| Other owners | 3334 |