Who is the only U.S. President to invent and patent something?

Answer 1

Thanks for the query.

Abraham Lincoln (February 12, 1809 – April 15, 1865), 16th President of USA patented an invention to lift boats over shoals and obstruction in a river. It is the only US patent ever registered to a President of the United States.

Source: https://en.wikipedia.org/wiki/Abraham_Lincoln%27s_patent