A working prototype would instantly silence all critics I'm not sure it would. The general view seems to be that this is feasible in the sense that under the r

A working prototype would instantly silence all critics I'm not sure it would. The general view seems to be that this is feasible in the sense that under the right conditions you can indeed transmit power via ultrasound. (See below) The issues are more around the fact that the energy loss is massive, and the there are genuine risks to human (and animal) health. So a prototype isn't the solution, unless that prototype is a lot more than a trade demo, and actually operates in a normal home/office, over an extended period of time. Evidence that many people think it's possible to produce a prototype, but not possible to produce a viable product: - https://news.ycombinator.com/item?id=10527361 https://news.ycombinator.com/item?id=10527361 - https://news.ycombinator.com/item?id=10527712 https://news.ycombinator.com/item?id=10527712 - https://news.ycombinator.com/item?id=10527607 https://news.ycombinator.com/item?id=10527607