- 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: 4359
10-year publication summary
|
314
|
340
|
233
|
258
|
276
|
228
|
254
|
225
|
213
|
60
|
| 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | 2025 | 2026 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| Halliburton Energy Services, Inc. | 21257 |
916 |
| Schlumberger Technology Corporation | 11584 |
632 |
| Saudi Arabian Oil Company | 13956 |
366 |
| Schlumberger Canada Limited | 7588 |
275 |
| Services Petroliers Schlumberger | 5996 |
253 |
| Schlumberger Technology B.v. | 5282 |
241 |
| Schlumberger Holdings Limited | 2724 |
134 |
| Prad Research and Development Limited | 2678 |
133 |
| Baker Hughes Incorporated | 5018 |
126 |
| Baker Hughes Oilfield Operations, LLC | 2480 |
76 |
| Baker Hughes, a GE Company, LLC | 2091 |
67 |
| Aramco Services Company | 4162 |
59 |
| ConocoPhillips Company | 1697 |
39 |
| Landmark Graphics Corporation | 1508 |
36 |
| Chevron U.S.A. Inc. | 4117 |
27 |
| ExxonMobil Upstream Research Company | 2331 |
27 |
| Weatherford Technology Holdings, LLC | 2072 |
18 |
| Southwest Petroleum University | 515 |
16 |
| Equinor Energy AS | 495 |
14 |
| Resman Technology AS | 35 |
14 |
| Other owners | 890 |