Oven for heating a product with RF energy

Details Oven for heating a product with RF energy Oven for heating a product with RF energy

2005-07-05

2005-07-05

Leung, Philip H. (Department: 3742)

Electric heating

Capacitive dielectric heating

With workpiece support

C219S776000, C219S779000, C219S780000, C099S358000, C099S451000, C422S022000, C034S254000, C426S244000

Reexamination Certificate

active

06914226

ABSTRACT:
RF energy provided by electrodes positioned between a product is used to heat a product that exhibits a variable impedance during the heating process. As the product's impedance changes during the heating process, RF heating system impedance can be maintained constant by adjusting the distance between the electrodes, adjusting the impedance of a variable impedance device connected between the RF power source and an electrode, or a combination of electrode distance adjustment and impedance adjustment of the variable impedance device. The system is particularly applicable to the heating or pasteurization of bulk food products with multiple heating zones.

REFERENCES:
patent: 2512311 (1950-06-01), Davis
patent: 2546004 (1951-03-01), Kinn
patent: 4221950 (1980-09-01), Lamberts et al.
patent: 4257167 (1981-03-01), Grassman
patent: 4567340 (1986-01-01), Latchum, Jr.
patent: 4974503 (1990-12-01), Koch
patent: 5942146 (1999-08-01), Blaker et al.

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