- 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: 5008
10-year publication summary
|
380
|
417
|
425
|
383
|
444
|
490
|
342
|
307
|
293
|
3
|
| 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | 2025 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| Halliburton Energy Services, Inc. | 20403 |
888 |
| Saudi Arabian Oil Company | 12390 |
563 |
| Schlumberger Technology Corporation | 10217 |
537 |
| Schlumberger Canada Limited | 7137 |
212 |
| Services Petroliers Schlumberger | 5616 |
173 |
| Schlumberger Technology B.v. | 5058 |
144 |
| Landmark Graphics Corporation | 1521 |
131 |
| Aramco Services Company | 3735 |
111 |
| Baker Hughes Incorporated | 5514 |
105 |
| Baker Hughes, a GE Company, LLC | 2138 |
92 |
| Prad Research and Development Limited | 2696 |
86 |
| Schlumberger Holdings Limited | 2870 |
85 |
| ConocoPhillips Company | 1676 |
81 |
| Chevron U.S.A. Inc. | 3844 |
75 |
| Baker Hughes Oilfield Operations, LLC | 2105 |
53 |
| ExxonMobil Upstream Research Company | 2456 |
48 |
| Southwest Petroleum University | 442 |
44 |
| PetroChina Company Limited | 564 |
35 |
| Baker Hughes Holdings LLC | 3013 |
34 |
| Equinor Energy AS | 485 |
28 |
| Other owners | 1483 |