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A comment on Ultrasonic Power Transfer Investigated Using Data from uBeam Patent Filings. Parent comment

Re:Ultrasonic Power Transfer Investigated Using Data from uB... by Retric on Tuesday October 20, 2015 @07:51PM (#10422677)
Yea, ~20% efficency and 17mW/cm^2 * 100cm^2 = 0.34w which is in the ballpark for useful power levels. 1/50th of that seems useless.
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