The comb-over (1977)
In its abstract, patent number 4,022,227 explains its, um, invention:
"A method of styling hair to cover partial baldness using only the hair on a person's head. The hair styling requires dividing a person's hair into three sections and carefully folding one section over another."
We figure that Mr. Trump probably does his 'do differently, or there might be a budding patent war.
This slideshow accompanies our story Can the U.S. patent system be saved? Click through to that story for a discussion of the issues.