While researching the Internal Combustion Engine and browsing around the USPTO.. I decided to look up good ol' Dean.
It seems his boys have patented an "Auxiliary Power Unit" or "APU." [
link ]
If you go to images, then jump to page 21, you'll see Dean's answer to everyone calling his Segway a scooter. Quite comical coming across it. Explained in I think page 31 of claims