• 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 47/22 - 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 negative mud pulses using a pressure relief valve between drill pipe and annulus

Patent holdings for IPC class E21B 47/22

Total number of patents in this class: 22

10-year publication summary

Principal owners for this class