&gt; If you take the idea, wireless power at a distance, and separate that from the method, via ultrasound, the idea is game-changing.<p>Uh. It is my understanding that free-space [0] wireless power transmission is a <i>rather</i> old tech. [1] You just pretty much never see it because if you want to move substantial amounts of power with a relatively small antenna, you <i>have</i> to keep living things a <i>significant</i> distance away from the transmission area, lest they cross between the Tx and Rx sides and get seriously harmed.<p>[0] That is, things like microwave or laser power transmission through the atmosphere rather than things like inductive charging mats and transmission rings.<p>[1] <a href="https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;Wireless_power_transfer#Far-field_radiative_techniques" rel="nofollow">https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;Wireless_power_transfer#Far-fi...</a> (Notice the mention of the microwave-powered RC helicopter in 1964.)