The Credit of inventing microwave oven goes to an American engineer and inventor Percy LeBaron Spencer.  In 1945, Spencer created a device to cook food using microwave radiation. In 1947 a commercial oven was being sold by Raytheon. The first microwave oven was called the Radarange. The first microwave oven weighed a hefty 750 pounds and stood five feet, six inches. It was large, expensive, and had a power of 1600 watts. The first domestic microwave oven was produced in 1967 by Amana (a division of Raytheon) marking the beginning of the use of microwave ovens in home kitchens.

Spencer was born on 9 July, 1894 in Howland, Maine. Spencer joined the U.S. Navy in 1912 to learn wireless telegraphy and he joined the Raytheon Company in the 1920s. He became Senior Vice President and a senior member of the Board of Directors at Raytheon. He received 300 patents during his career at Raytheon; a building there is named after him. For his work he was awarded the Distinguished Public Service Award by the US Navy.