- 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 47/20 - 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 using acoustic waves through the well fluid by modulation of mud waves, e.g. by continuous modulation
Patent holdings for IPC class E21B 47/20
Total number of patents in this class: 74
10-year publication summary
|
7
|
5
|
5
|
4
|
5
|
3
|
9
|
12
|
6
|
0
|
| 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | 2025 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| Halliburton Energy Services, Inc. | 20749 |
19 |
| China Petroleum & Chemical Corporation | 1869 |
3 |
| Institute of Geology and Geophysics, Chinese Academy of Sciences | 324 |
3 |
| Rime Downhole Technologies, LLC | 27 |
3 |
| Baker Hughes, a GE Company, LLC | 2115 |
3 |
| Schlumberger Technology Corporation | 10627 |
2 |
| Schlumberger Canada Limited | 7235 |
2 |
| China National Petroleum Corporation | 418 |
2 |
| Evolution Engineering Inc. | 301 |
2 |
| NCS Multistage Inc. | 177 |
2 |
| Saudi Arabian Oil Company | 12858 |
2 |
| Vertex Downhole Ltd. | 5 |
2 |
| Baker Hughes Oilfield Operations, LLC | 2269 |
2 |
| CNPC Engineering Technology R&D Company Limited | 92 |
2 |
| Sinopec Petroleum Engineering Technology Service Co., Ltd. | 20 |
2 |
| Geosteering & Logging Research Institute, Sinopec Matrix Corporation | 10 |
2 |
| Sinopec Matrix Corporation | 10 |
2 |
| Schlumberger Technology B.v. | 5148 |
1 |
| Schlumberger Holdings Limited | 2841 |
1 |
| APS Technology, Inc. | 78 |
1 |
| Other owners | 16 |