Electric heating – Metal heating – Of cylinders
Patent
1988-06-02
1989-10-03
Leung, Philip H.
Electric heating
Metal heating
Of cylinders
219 1055E, 374149, 99325, H05B 668
Patent
active
048718912
ABSTRACT:
A microwave oven which provides defrosting control for a frozen product to be defrosted. The oven comprises a microwave source and a detector arranged in the oven cavity in the proximity of the frozen product, the detector including a material which absorbs microwave energy, the absorption of microwave energy by the detector and by the frozen product causing their temperatures to rise and thereby defrosting such product. Variations in the detector temperature are measured by a measuring element which provides an electrical signal corresponding thereto. The detector is configured and insulated so as to have a heat exchange characteristic with its environment which results in its temperature detection sensitivity remaining constant during each of a plurality of successive defrosting operations of the oven. A computer control device evaluates when a defrosting operation has been completed by determining when the slope of the signal variation as a function of time remains the same at successive sampling instants.
REFERENCES:
patent: 3478187 (1969-11-01), Agdur et al.
patent: 3660661 (1972-05-01), Lachambre
patent: 3768059 (1973-10-01), Day
patent: 4038105 (1977-07-01), Brandeberry et al.
patent: 4341937 (1982-07-01), Staats
Delmas Gilles
Hazan Jean-Pierre
Steers Michel
Eason Leroy
Leung Philip H.
Tamoshunas Algy
U.S. Philips Corporation
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