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.
Neff GmbH
In 1971 it introduced its "Circotherm" system whereby hot air was circulated around the oven to allow a distribution of cooking with more regularity. These cookers are known as convection oven or fan ovens, and are still for a specialist market. The Circotherm system was patented by the company, marketed under the slogan "Rundum-Hitze ist mehr" (all around heat is more). In 1985, the convection oven system was first introduced for gas ovens.