Apple's co-founder Steve Jobs and Amazon.com's Jeff Bezos were among a select few allowed to see the designs for Kamen's plan.
Jobs said Ginger had the potential to restructure cities and Amazon.com is already offering to sell the invention when it is ready.
The Stirling engine is powered by heat generated by any fuel. Hydrogen, a potential fuel source, would be a tremendous advantage to alleviating environmental concerns since it has very few emissions.
The engine operates differently from an internal combustion engine and promises to be more fuel-efficient.
Stirling engines could potentially eliminate the need for electric grids, responsible for much of the waste associated with the burning of natural gas. With the new engine, homes would ideally be able to generate inexpensive power from a machine smaller than an air conditioner, experts reported.