- 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 47/135 - 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: 479
10-year publication summary
|
32
|
27
|
47
|
51
|
81
|
45
|
41
|
36
|
40
|
20
|
| 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | 2025 | 2026 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| Halliburton Energy Services, Inc. | 21305 |
176 |
| Saudi Arabian Oil Company | 14275 |
46 |
| Schlumberger Technology Corporation | 11839 |
34 |
| Baker Hughes Oilfield Operations, LLC | 2534 |
15 |
| Weatherford Technology Holdings, LLC | 2160 |
11 |
| Aramco Services Company | 4194 |
11 |
| Stone Aerospace, Inc. | 28 |
9 |
| BP Exploration Operating Company Limited | 256 |
8 |
| Hifi Engineering Inc. | 140 |
8 |
| Schlumberger Canada Limited | 7609 |
7 |
| Lytt Limited | 45 |
7 |
| Baker Hughes Incorporated | 4922 |
6 |
| Chevron U.S.A. Inc. | 4145 |
6 |
| Baker Hughes Holdings LLC | 3023 |
6 |
| Astro Technology Group, LLC | 24 |
5 |
| Schlumberger Technology B.v. | 5295 |
4 |
| ConocoPhillips Company | 1711 |
4 |
| Services Petroliers Schlumberger | 6028 |
4 |
| Massachusetts Institute of Technology | 10259 |
3 |
| ExxonMobil Upstream Research Company | 2297 |
3 |
| Other owners | 106 |