Microwave oven
The development of the cavity magnetron in the UK made possible the production of electromagnetic waves of a small enough wavelength (microwaves). American engineer Percy Spencer is generally credited with inventing the modern microwave oven after World War II from radar technology developed during the war. Named the "Radarange", it was first sold in 1946. Raytheon later licensed its patents for a home-use microwave oven that was first introduced by Tappan in 1955, but these units were still too large and expensive for general home use. Sharp Corporation introduced the first microwave oven with a turntable between 1964 and 1966. The countertop microwave oven was first introduced in 1967 by the Amana Corporation. After Sharp introduced low-cost microwave ovens affordable for residential use in the late 1970s, their use spread into commercial and residential kitchens around the world. In addition to their use in cooking food, types of microwave ovens are used for heating in many industrial processes.
TV dinner
Several smaller companies had conceived of frozen dinners earlier (see Invention section below), but the first to achieve success was Swanson. The first Swanson-brand TV Dinner was produced in the United States and consisted of a Thanksgiving meal of turkey, cornbread dressing, frozen peas and sweet potatoes packaged in a tray like those used at the time for airline food service. Each item was placed in its own compartment. The trays proved to be useful: the entire dinner could be removed from the outer packaging as a unit, the tray with its aluminum foil covering could be heated directly in the oven without any extra dishes, and one could eat the meal directly from the tray. The product was cooked for 25 minutes at and fit nicely on a TV tray table. The original TV Dinner sold for 98 cents, and had a production estimate of 5,000 dinners for the first year.