- 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: 6275
10-year publication summary
|
495
|
463
|
395
|
305
|
336
|
230
|
260
|
219
|
201
|
41
|
| 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | 2025 | 2026 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| Halliburton Energy Services, Inc. | 21161 |
1430 |
| Schlumberger Technology Corporation | 11449 |
581 |
| Schlumberger Canada Limited | 7544 |
403 |
| Services Petroliers Schlumberger | 5975 |
352 |
| Schlumberger Technology B.v. | 5270 |
294 |
| Saudi Arabian Oil Company | 13940 |
289 |
| Baker Hughes Incorporated | 5057 |
250 |
| Baker Hughes, a GE Company, LLC | 2101 |
147 |
| Schlumberger Holdings Limited | 2743 |
126 |
| Prad Research and Development Limited | 2679 |
119 |
| Baker Hughes Oilfield Operations, LLC | 2430 |
115 |
| Weatherford Technology Holdings, LLC | 2033 |
93 |
| Evolution Engineering Inc. | 300 |
92 |
| Landmark Graphics Corporation | 1507 |
77 |
| Geoquest Systems B.V. | 841 |
54 |
| Aramco Services Company | 4172 |
51 |
| Baker Hughes Holdings LLC | 2981 |
45 |
| Expro North Sea Limited | 235 |
43 |
| Metrol Technology Limited | 85 |
43 |
| ExxonMobil Upstream Research Company | 2340 |
42 |
| Other owners | 1629 |