- 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 49/00 - Testing the nature of borehole wallsFormation testingMethods or apparatus for obtaining samples of soil or well fluids, specially adapted to earth drilling or wells
Patent holdings for IPC class E21B 49/00
Total number of patents in this class: 5281
10-year publication summary
|
354
|
388
|
388
|
359
|
426
|
468
|
331
|
300
|
303
|
278
|
| 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | 2025 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| Halliburton Energy Services, Inc. | 21090 |
913 |
| Saudi Arabian Oil Company | 13686 |
631 |
| Schlumberger Technology Corporation | 11075 |
593 |
| Schlumberger Canada Limited | 7440 |
219 |
| Services Petroliers Schlumberger | 5885 |
181 |
| Schlumberger Technology B.v. | 5224 |
148 |
| Landmark Graphics Corporation | 1515 |
133 |
| Aramco Services Company | 4099 |
125 |
| Baker Hughes Incorporated | 5172 |
102 |
| Baker Hughes, a GE Company, LLC | 2105 |
92 |
| ConocoPhillips Company | 1689 |
86 |
| Schlumberger Holdings Limited | 2784 |
85 |
| Prad Research and Development Limited | 2687 |
85 |
| Chevron U.S.A. Inc. | 4020 |
79 |
| Baker Hughes Oilfield Operations, LLC | 2393 |
56 |
| Southwest Petroleum University | 487 |
49 |
| ExxonMobil Upstream Research Company | 2378 |
47 |
| PetroChina Company Limited | 726 |
38 |
| Baker Hughes Holdings LLC | 3002 |
34 |
| Geoquest Systems B.V. | 796 |
28 |
| Other owners | 1557 |