Oh yes, in mars 2002 the yank physicist Thomas Bearden was granted a patent for a perpeetum mobile machine running on energy from empty space.
http://www.cheniere.org/
Considering their credibility I'm not surprised the USPTO is giving away patents to every merkin nutcase claiming he/she has invented things already invented in other countries decades/centuries ago.
FYI, the airplane, helicopter and parachute was invented by Leonardo Da Vinci about 500 years ago. Replicas built from his drawings are flying today.
Webzpider
'Nevah argue wif an idiot - he'll jest drag yo' down to his level an' beatcha wif his superio' experience.'
Ooopsss, ah jest did! Fry mah hide!! Fry mah hide!