Who is the only U.S. president to have registered a patent for his invention?

Abraham Lincoln
Theodore Roosevelt
Thomas Jefferson
Rutherford B. Hayes
Abraham Lincoln  Abraham Lincoln is the only US president to have a registered patent for his invention. On March 10, 1849, he filed a patent for a device that would help ships float over shallow areas of water. The patent was approved two months later as Patent No. 6,469.

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