This is based on a misconception that turns up every few years, that you can use resonant systems as a means of efficiently transferring energy. What the enginasters ignore is the fact that withdrawing energy from a resonant system destroys the Q factor of the system, so that it eventually ceases to become resonant. Even the giant brains at MIT fell into this trap (see Trivial Pursuit, Numberwatch, June 2007).
What you never see is the subsequent announcement that it did not work.
Or we see premature announcements of success..... whatever happened to Steorn?...... still going strong it seems.
I liked the expression "perpetual Commotion" in one blog reporting on the "ORBO Power cube"