Buoyancy / Gravity Object Turbine
http://www.google.com/patents/WO2013128466A2?cl=en
Archimede’s Wheel
http://www.nuenergy.org/generator-driven-by-a-buoyancy-engine/
Gravity and Buoyancy engine
http://www.faqs.org/patents/imgfull/20120198833_05
Help