> If you take the idea, wireless power at a distance, and separate that from the method, via ultrasound, the idea is game-changing. Uh. It is my understanding

> If you take the idea, wireless power at a distance, and separate that from the method, via ultrasound, the idea is game-changing. Uh. It is my understanding that free-space [0] wireless power transmission is a rather 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 have to keep living things a significant distance away from the transmission area, lest they cross between the Tx and Rx sides and get seriously harmed. [0] That is, things like microwave or laser power transmission through the atmosphere rather than things like inductive charging mats and transmission rings. [1] https://en.wikipedia.org/wiki/Wireless_power_transfer#Far-field_radiative_techniques https://en.wikipedia.org/wiki/Wireless_power_transfer#Far-fi... (Notice the mention of the microwave-powered RC helicopter in 1964.)