Unfortunately, as in paraphysics and parapsychology, the amateur wannabees give legitimate zero point energy quantum vacuum physics research a bad taint and the public is not able to tell the difference - especially venture capitalists. Equally, on the other side of the aisle, knee-jerk debunker professional skeptics some with engineering and physics degrees cannot tell the difference either. It's as bad as the wing-nuts in politics on both the left and the right. 

From Robert Parks

"3.  PATENT NONSENSE:  CASE LAW ON PERPETUAL MOTION MACHINES.
When Joseph Newman was refused a patent for his Energy Machine he sued the 
US patent office. Legendary US District Court Judge Robert Penfield Jackson 
ordered Newman to turn his machine over to the National Bureau of Standards 
for testing. It was found to be a motor/generator of a design vastly 
inferior to those on the market.  The case, Newman v. Quigg (Quigg was the 
patent Commissioner) is cited as case-law giving the patent office 
authority to reject perpetual-motion claims out of hand. The only effect is 
that they are no longer called "perpetual motion machines."  They are 
called over-unity devices, or zero-point-energy machines.  Coverage of the 
Joe Newman case in Wikipedia is terrible. It's a remarkably useful 
encyclopedia, but you need to verify."
 http://www.bobpark.org