Sony has been hooked on the trend of cordless power!
With magnetic resonance techniques and lessons learned from the company's radio project they have developed a system that would put 60 watts over 50 cm. It is sufficient for the application Sony mentions: completely cordless televisions.
The technology means that the transmitter only sends energy to the receiver operating at exactly the right frequency. There is no risk that the vacuum cleaner heats up if it comes in the between.
Apparatus belonging to the passive "extenders", range extenders, which can increase the distance of 80 cm with an efficiency of 60 percent.
It may take a time before Sony's researchers reaches the consumer products.
Source: (In Swedish)
Regards Fredrik