Who is the only US president to have registered a patent with the USPTO for his invention?
The only US patent registered to a President belonged to Abraham Lincoln. Patent number 6,469 was issued on the 22nd of May, 1849 to the President for his invention for lifting boats over shoals and obstructions in rivers. He decided to invent such a mechanism when his own boat got hung up on obstructions several times.
The patent paper itself