Presidential Invention
Updated February 23, 2017 | Factmonster Staff 
The Question:
Who was the only U.S. president to have a patent on an invention? What was the invention?
The Answer:
On May 22, 1849 Abraham Lincoln was granted U.S. Patent No. 6,469 "A Device for Buoying Vessels over Shoals."
Here is a link to the patent of his invention.
-The Fact Monster
See also:
