The inventor of the microwave appliance received only $2 for his discovery. Percy Spencer was working as a researcher for American Appliance Company (now Raytheon) when he noticed that a radar set using electromagnetic waves melted the candy bar in his pocket. He had the idea to make a metal box using microwaves to heat food, but the company was the one to file the patent. That was in 1945, and he received a $2 bonus but never any royalties.