A home-use microwave was introduced by Tappan in1955,but these microwaves were too large and expensive for the average person. The countertop microwave oven was first introduced in 1967 by the Amana Corporation.
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Right after WW II and the military development of radar.
In 1946, Dr. Percy Spencer, an engineer for the Raytheon Company, pulled the idea for the microwave oven right out of his pocket. Check Out this link for more info, http://www.coolquiz.com/trivia/explain/docs/microwave.asp
This page should answer your question : http://en.wikipedia.org/wiki/Microwave_oven