Electric heating – Metal heating – Of cylinders
Patent
1983-02-18
1985-05-28
Leung, Philip H.
Electric heating
Metal heating
Of cylinders
219 1055E, 219 1055F, 99325, 99DIG14, H05B 668
Patent
active
045202508
ABSTRACT:
Many frozen foods are now sold on the market and also produced by household refrigerators, and most of these frozen foods are eaten after thawing or after cooking under heat subsequent to thawing. The importance of thawing is thus increasing more and more. This invention provides a heating apparatus of simple construction capable of effectively thawing a frozen food to meet the above demand. The heating apparatus of the present invention is based on the fact that the dielectric loss of a frozen food itself varies as the frozen food is progressively heated. In the heating apparatus, a signal wave is directed toward a frozen food, and the variation of the rate of absorption of the signal wave due to the dielectric loss of the food is measured, so as to automatically control the process of heating for thawing on the basis of the result of measurement.
REFERENCES:
patent: 2744990 (1956-05-01), Schroeder
patent: 3257614 (1966-06-01), Hankin et al.
patent: 3320396 (1967-05-01), Boehm
patent: 3439431 (1969-04-01), Heidtmann
patent: 3589177 (1971-06-01), Merlo
patent: 4009359 (1977-02-01), Tallmadge et al.
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patent: 4210795 (1980-07-01), Lentz
Ishihara Masahiro
Kikuchi Itsuo
Ohkawa Shuji
Taguchi Shunichi
Watanabe Mitsuru
Hitachi Heating Appliances Co., Ltd.
Leung Philip H.
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