If people just understood the inverse square law and other related functions, stuff like this wouldn't be thought of as so revolutionary. While I do see some po

If people just understood the inverse square law and other related functions, stuff like this wouldn't be thought of as so revolutionary. While I do see some potential for this technology as a product for those that do not care about their home electricity bill, would you really want to have less than 1% efficiency? Think of it this way: You are using electricity to generate oscillating waves in the air, directing that to a receiver, which is then turning that back in to electricity. This has some promise for extremely low power devices (think milliwatts), would you want to have a 500W power supply to charge a 5W phone? References: https://workspace.imperial.ac.uk/opticalandsemidev/Public/Publications/Ultrasonic%20vs.%20Inductive.pdf https://workspace.imperial.ac.uk/opticalandsemidev/Public/Pu... (39% efficency at 1mm, 0.013% at 10cm) The best that I've seen (promising for IoT...) "The authors showed that with these transducers data communications can be achieved at wall-transducer standoff distances of up to 10 mm. Of the many tested configurations, the authors quote the performance of a 400 mW Tx system operating across a 25 mm steel wall. This system achieved a 10 mW power transmission (0.25% efficiency) and a 1 Mb/s data transmission rate. The authors expect that the power transmission efficiency can be increased to 1%." http://iopscience.iop.org/1742-6596/305/1/012088/pdf/1742-6596_305_1_012088.pdf http://iopscience.iop.org/1742-6596/305/1/012088/pdf/1742-65...