U.S. Presidents and patents: Who is the only U.S. President to invent and hold a U.S. patent? Context: He patented a device to buoy vessels over shoals (Patent No. 6469, 1849). Choose the correct name.

Given data

• The question seeks the only U.S. President who held a patent.
• Device: buoying vessels over shoals and obstructions.

Reasoning
Abraham Lincoln received U.S. Patent 6469 on May 22, 1849 for a flotation device to lift boats over shoals, making him the only U.S. President with a patent.

Common pitfalls

• Choosing Jefferson (a prolific inventor and designer) — he never held a U.S. patent.

Final Answer
Abraham Lincoln.