Question: Which U.S. President was the only one to hold a patent?
Answer: Abraham Lincoln was granted patent No. 6,469 on May 22, 1849 for a device designed to buoy vessels over shoals. His idea, to equip boats with inflatable bellows of “india-rubber cloth, or other suitable water-proof fabric” levered alongside the hull, came as a result of river and lake expeditions he made as a young man, ferrying people and produce on the Mississippi River and the Great Lakes.
