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The first microwave oven
Spencer submitted his first patent application for heating food with microwaves.
The patent described two parallel magnetrons that heat food that passes by on a conveyor belt. -
Period: to
Microwave oven throughout the years
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Microwave-heating device enclosed in an oven
Spencer's co-workers, applied for a patent for a microwave-heating device enclosed in an oven.
This device consisted of two microwave-generating magnetron tubes packed in a metallic box. The oven included a timer and a means of controlling power. -
Raytheon built the "Radarange"
a freestanding white-enamel unit
operating at 220 volts of electricity
an internal water-cooling system
1.8 metres tall, weighed 340 kilograms
consumed 3 kilowatts -
The first domestic commercial Radarange
powered by a 1,400-to 1,700-watt magnetron
was water cooled
required plumbing connections -
Domestic Microwaves
a magnetron requiring less power
a cabinet with an air-cooled system
, the magnetron and related components, were relocated behind the oven -
Litton design
Designed the microwave, the short, wide shape that is now common. -
The first home model
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Microwave market
Several other companies joined in the market and almost 25% of American househoulds owns a microwave owen
