- 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 47/135 - Means for transmitting measuring-signals or control signals from the well to the surface, or from the surface to the well, e.g. for logging while drilling by electromagnetic energy, e.g. of radio frequency range using light waves, e.g. infrared or ultraviolet waves
Patent holdings for IPC class E21B 47/135
Total number of patents in this class: 385
10-year publication summary
|
12
|
10
|
32
|
27
|
46
|
51
|
79
|
42
|
36
|
5
|
| 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 |
148 |
| Saudi Arabian Oil Company | 11322 |
34 |
| Schlumberger Technology Corporation | 9690 |
25 |
| Baker Hughes Oilfield Operations, LLC | 1885 |
14 |
| BP Exploration Operating Company Limited | 270 |
9 |
| Stone Aerospace, Inc. | 27 |
9 |
| Schlumberger Canada Limited | 6913 |
8 |
| Weatherford Technology Holdings, LLC | 2135 |
8 |
| Aramco Services Company | 3504 |
8 |
| Lytt Limited | 51 |
8 |
| Baker Hughes Incorporated | 5689 |
6 |
| Hifi Engineering Inc. | 125 |
6 |
| Baker Hughes Holdings LLC | 3060 |
6 |
| Chevron U.S.A. Inc. | 3774 |
5 |
| Schlumberger Technology B.v. | 4951 |
4 |
| Services Petroliers Schlumberger | 5426 |
4 |
| ConocoPhillips Company | 1657 |
3 |
| Evolution Engineering Inc. | 313 |
3 |
| ExxonMobil Upstream Research Company | 2525 |
3 |
| Silixa Ltd. | 95 |
3 |
| Other owners | 71 |