- 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: 6298
10-year publication summary
|
556
|
532
|
451
|
336
|
384
|
259
|
281
|
240
|
223
|
61
|
| 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | 2025 | 2026 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| Halliburton Energy Services, Inc. | 21257 |
1435 |
| Schlumberger Technology Corporation | 11584 |
587 |
| Schlumberger Canada Limited | 7588 |
408 |
| Services Petroliers Schlumberger | 5996 |
355 |
| Schlumberger Technology B.v. | 5282 |
297 |
| Saudi Arabian Oil Company | 13956 |
289 |
| Baker Hughes Incorporated | 5018 |
250 |
| Baker Hughes, a GE Company, LLC | 2091 |
146 |
| Schlumberger Holdings Limited | 2724 |
126 |
| Prad Research and Development Limited | 2678 |
119 |
| Baker Hughes Oilfield Operations, LLC | 2480 |
115 |
| Weatherford Technology Holdings, LLC | 2072 |
93 |
| Evolution Engineering Inc. | 301 |
92 |
| Landmark Graphics Corporation | 1508 |
79 |
| Geoquest Systems B.V. | 856 |
54 |
| Aramco Services Company | 4162 |
51 |
| Baker Hughes Holdings LLC | 2986 |
45 |
| Metrol Technology Limited | 85 |
43 |
| ExxonMobil Upstream Research Company | 2331 |
42 |
| Expro North Sea Limited | 233 |
41 |
| Other owners | 1631 |