- 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 47/12 - 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
Patent holdings for IPC class E21B 47/12
Total number of patents in this class: 6161
10-year publication summary
|
526
|
495
|
463
|
395
|
304
|
335
|
230
|
257
|
218
|
158
|
| 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | 2025 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| Halliburton Energy Services, Inc. | 20977 |
1410 |
| Schlumberger Technology Corporation | 10914 |
555 |
| Schlumberger Canada Limited | 7373 |
390 |
| Services Petroliers Schlumberger | 5835 |
342 |
| Schlumberger Technology B.v. | 5189 |
286 |
| Saudi Arabian Oil Company | 13428 |
285 |
| Baker Hughes Incorporated | 5243 |
253 |
| Baker Hughes, a GE Company, LLC | 2109 |
147 |
| Schlumberger Holdings Limited | 2800 |
126 |
| Prad Research and Development Limited | 2690 |
119 |
| Baker Hughes Oilfield Operations, LLC | 2334 |
110 |
| Weatherford Technology Holdings, LLC | 2033 |
95 |
| Evolution Engineering Inc. | 301 |
92 |
| Landmark Graphics Corporation | 1523 |
76 |
| Geoquest Systems B.V. | 776 |
52 |
| Aramco Services Company | 4039 |
51 |
| Expro North Sea Limited | 232 |
46 |
| Baker Hughes Holdings LLC | 2999 |
46 |
| Metrol Technology Limited | 85 |
43 |
| ExxonMobil Upstream Research Company | 2390 |
42 |
| Other owners | 1595 |