- 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 49/02 - Testing the nature of borehole wallsFormation testingMethods 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: 750
10-year publication summary
|
33
|
46
|
50
|
40
|
42
|
58
|
51
|
48
|
45
|
44
|
| 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | 2025 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| Saudi Arabian Oil Company | 13656 |
92 |
| Halliburton Energy Services, Inc. | 21078 |
90 |
| Schlumberger Technology Corporation | 11054 |
72 |
| Schlumberger Canada Limited | 7432 |
36 |
| Services Petroliers Schlumberger | 5884 |
36 |
| Schlumberger Technology B.v. | 5223 |
33 |
| Baker Hughes Incorporated | 5175 |
24 |
| Schlumberger Holdings Limited | 2790 |
14 |
| Prad Research and Development Limited | 2687 |
14 |
| Aramco Services Company | 4095 |
13 |
| Baker Hughes, a GE Company, LLC | 2106 |
13 |
| Southwest Petroleum University | 486 |
9 |
| Chevron U.S.A. Inc. | 4018 |
8 |
| ConocoPhillips Company | 1685 |
8 |
| Baker Hughes Oilfield Operations, LLC | 2390 |
8 |
| Charm Industrial, Inc. | 22 |
8 |
| Longyear TM, Inc. | 100 |
6 |
| PetroChina Company Limited | 725 |
6 |
| ExxonMobil Technology and Engineering Company | 1167 |
6 |
| Bauer Maschinen GmbH | 228 |
5 |
| Other owners | 249 |