- 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 49/02 - 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 by mechanically taking samples of the soil
Patent holdings for IPC class E21B 49/02
Total number of patents in this class: 659
10-year publication summary
|
38
|
37
|
50
|
59
|
42
|
44
|
62
|
53
|
48
|
21
|
| 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 |
76 |
| Saudi Arabian Oil Company | 11322 |
74 |
| Schlumberger Technology Corporation | 9690 |
60 |
| Schlumberger Canada Limited | 6913 |
30 |
| Services Petroliers Schlumberger | 5426 |
28 |
| Schlumberger Technology B.v. | 4951 |
25 |
| Baker Hughes Incorporated | 5689 |
24 |
| Schlumberger Holdings Limited | 2947 |
14 |
| Prad Research and Development Limited | 2696 |
14 |
| Baker Hughes, a GE Company, LLC | 2171 |
13 |
| Boart Longyear Company | 262 |
13 |
| Southwest Petroleum University | 403 |
9 |
| Aramco Services Company | 3504 |
8 |
| ConocoPhillips Company | 1657 |
8 |
| Baker Hughes Oilfield Operations, LLC | 1885 |
8 |
| Chevron U.S.A. Inc. | 3774 |
6 |
| Longyear TM, Inc. | 139 |
6 |
| PetroChina Company Limited | 462 |
6 |
| Bauer Maschinen GmbH | 210 |
5 |
| ExxonMobil Upstream Research Company | 2525 |
5 |
| Other owners | 227 |