American engineer Percy Spencer invented the modern microwave oven from radar technology developed during WWII. Named “Radarange,” the oven went on sale in 1946.
A microwave oven introduced by Tappan in 1955 was too large and expensive for general home use.
The first microwave oven with a turntable was produced by the Sharp Corporation in 1964.
In 1967 the Amana Corporation introduced a countertop microwave oven.
Affordable microwave ovens became available for residential use in the late 1970s.
Source: Wikipedia