- 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 49/08 - Obtaining fluid samples or testing fluids, in boreholes or wells
Patent holdings for IPC class E21B 49/08
Total number of patents in this class: 4341
10-year publication summary
|
289
|
317
|
219
|
248
|
269
|
218
|
231
|
219
|
204
|
31
|
| 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | 2025 | 2026 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| Halliburton Energy Services, Inc. | 21144 |
904 |
| Schlumberger Technology Corporation | 11349 |
627 |
| Saudi Arabian Oil Company | 13904 |
365 |
| Schlumberger Canada Limited | 7524 |
274 |
| Services Petroliers Schlumberger | 5945 |
253 |
| Schlumberger Technology B.v. | 5259 |
241 |
| Schlumberger Holdings Limited | 2753 |
135 |
| Prad Research and Development Limited | 2683 |
133 |
| Baker Hughes Incorporated | 5088 |
128 |
| Baker Hughes Oilfield Operations, LLC | 2424 |
74 |
| Baker Hughes, a GE Company, LLC | 2105 |
67 |
| Aramco Services Company | 4158 |
60 |
| ConocoPhillips Company | 1699 |
37 |
| Landmark Graphics Corporation | 1509 |
36 |
| ExxonMobil Upstream Research Company | 2348 |
27 |
| Chevron U.S.A. Inc. | 4073 |
26 |
| Weatherford Technology Holdings, LLC | 2040 |
17 |
| Resman AS | 77 |
17 |
| Southwest Petroleum University | 501 |
15 |
| Equinor Energy AS | 499 |
14 |
| Other owners | 891 |