- 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 47/0228 - Determining slope or direction of the borehole, e.g. using geomagnetism using electromagnetic energy or detectors therefor
Patent holdings for IPC class E21B 47/0228
Total number of patents in this class: 251
10-year publication summary
|
5
|
10
|
11
|
13
|
23
|
35
|
27
|
15
|
15
|
7
|
| 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | 2025 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| Halliburton Energy Services, Inc. | 20944 |
95 |
| Schlumberger Technology Corporation | 10868 |
15 |
| Schlumberger Canada Limited | 7363 |
13 |
| Services Petroliers Schlumberger | 5827 |
10 |
| Schlumberger Technology B.v. | 5187 |
8 |
| Merlin Technology, Inc. | 162 |
8 |
| Baker Hughes Oilfield Operations, LLC | 2320 |
7 |
| Prad Research and Development Limited | 2692 |
6 |
| Saudi Arabian Oil Company | 13349 |
6 |
| Schlumberger Holdings Limited | 2808 |
5 |
| Baker Hughes Incorporated | 5251 |
5 |
| Applied Technologies Associates, Inc. | 12 |
5 |
| The Charles Machine Works, Inc. | 405 |
3 |
| ConocoPhillips Company | 1675 |
3 |
| Hunting Titan, Inc. | 247 |
3 |
| Magnetic Variation Services, LLC | 38 |
3 |
| Scientific Drilling International, Inc. | 168 |
3 |
| Vector Magnetics, LLC | 12 |
3 |
| U-target Energy Ltd. | 6 |
3 |
| Gunnar LLLP | 4 |
3 |
| Other owners | 44 |