- 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: 265
10-year publication summary
|
5
|
10
|
11
|
13
|
23
|
35
|
27
|
16
|
15
|
14
|
| 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | 2025 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| Halliburton Energy Services, Inc. | 21103 |
95 |
| Schlumberger Technology Corporation | 11089 |
18 |
| Schlumberger Canada Limited | 7446 |
14 |
| Services Petroliers Schlumberger | 5888 |
11 |
| Schlumberger Technology B.v. | 5224 |
9 |
| Merlin Technology, Inc. | 164 |
8 |
| Saudi Arabian Oil Company | 13716 |
7 |
| Baker Hughes Oilfield Operations, LLC | 2395 |
7 |
| Prad Research and Development Limited | 2687 |
6 |
| Schlumberger Holdings Limited | 2780 |
5 |
| Baker Hughes Incorporated | 5168 |
5 |
| Applied Technologies Associates, Inc. | 12 |
5 |
| Vector Magnetics, LLC | 13 |
4 |
| The Charles Machine Works, Inc. | 413 |
3 |
| ConocoPhillips Company | 1690 |
3 |
| Hunting Titan, Inc. | 244 |
3 |
| Magnetic Variation Services, LLC | 38 |
3 |
| Scientific Drilling International, Inc. | 169 |
3 |
| U-target Energy Ltd. | 6 |
3 |
| Gunnar LLLP | 5 |
3 |
| Other owners | 50 |