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How many U.S. Presidents held/hold patents?

10/19/2017

 
Only one - Abraham Lincoln.

In 1849, then-attorney Abraham Lincoln was granted Patent No. 6,469 for a device that could be filled with air to allow a ship to pass through shoals or shallow water.   

Lincoln's law partner, William Herndon, wryly observed, "The invention was never applied to any vessel, so far as I ever learned, and the threatened revolution in steamboat architecture and navigation never came to pass."

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