Only prez to receive a patent

To solve the crossword clue ‘Only prez to receive a patent’, the first step would be to consider which US presidents have been awarded patents. A quick search and scan through history confirms that only one president, Abraham Lincoln, was awarded a patent in 1849 for a device to lift boats over shoals and obstructions in a river. Hence, the answer to the crossword clue must be ‘ABE‘, the nickname of the 16th President of the United States, Abraham Lincoln. The insight here is that although quite a few US presidents may have been inventors or made significant inventions, only one of them, Abraham Lincoln, was awarded a patent. Breaking down and considering the elements of the crossword clue in a logical and analytical way ultimately leads to identifying the correct answer which in this case was ‘ABE.’