- All sections
- E - Fixed constructions
- E21B - Earth or rock drilling; obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B 49/00 - Testing the nature of borehole walls; Formation testing; Methods 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: 4790
10-year publication summary
344
|
380
|
417
|
425
|
382
|
445
|
489
|
340
|
300
|
85
|
2015 | 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 |
Principal owners for this class
Owner |
All patents
|
This class
|
---|---|---|
Halliburton Energy Services, Inc. | 20165 |
863 |
Schlumberger Technology Corporation | 9690 |
513 |
Saudi Arabian Oil Company | 11322 |
512 |
Schlumberger Canada Limited | 6913 |
204 |
Services Petroliers Schlumberger | 5426 |
165 |
Schlumberger Technology B.v. | 4951 |
138 |
Landmark Graphics Corporation | 1526 |
131 |
Baker Hughes Incorporated | 5689 |
110 |
Aramco Services Company | 3504 |
106 |
Baker Hughes, a GE Company, LLC | 2171 |
92 |
Schlumberger Holdings Limited | 2947 |
88 |
Prad Research and Development Limited | 2696 |
86 |
ConocoPhillips Company | 1657 |
78 |
Chevron U.S.A. Inc. | 3774 |
75 |
ExxonMobil Upstream Research Company | 2525 |
52 |
Baker Hughes Oilfield Operations, LLC | 1885 |
48 |
Southwest Petroleum University | 403 |
42 |
Baker Hughes Holdings LLC | 3060 |
34 |
Equinor Energy AS | 475 |
29 |
PetroChina Company Limited | 462 |
27 |
Other owners | 1397 |