I don't understand how this could be patented. Surely someone else has thought about using transducers to transmit power a long time ago? I see a similar pate

I don't understand how this could be patented. Surely someone else has thought about using transducers to transmit power a long time ago? I see a similar patent here filed in 2003 that covers ultrasound transducers for wireless power transfer. http://www.google.com/patents/US6798716 http://www.google.com/patents/US6798716