Electric heating – Metal heating – Of cylinders
Patent
1983-01-10
1984-10-02
Envall, Jr., Roy N.
Electric heating
Metal heating
Of cylinders
219 1055E, 219 1055R, 34087026, 374117, 374149, 374155, H05B 668
Patent
active
044750242
ABSTRACT:
The present invention is directed to a cooking utensil such as a microwave oven wherein a food temperature-sensing probe is inserted into a foodstuff for detecting the internal temperature of the food. The food temperature-sensing probe includes a resonance circuit the resonance frequency of which varies depending on the internal temperature. A first signal generator is provided for delivering a series of signals which contain a variety of frequencies inclusive of the signals of the resonance frequency. A second signal generator is employed to provide sweeping signals for the series of signals developed from the first signal generator. A selecting circuit is connected to the second signal generator for selecting a particular value in the sweeping signals relevant to the desired temperature of the foodstuff. A wireless controlled circuit is provided which determines the occurence of the dip phenomena in a relationship with the particular value in the sweeping signals under the radiation of the series of signals generated from the first signal generator.
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Envall Jr. Roy N.
Leung Philip H.
Sharp Kabushiki Kaisha
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