Microwave ovens and methods of cooking foods

Details Microwave ovens and methods of cooking foods Microwave ovens and methods of cooking foods

1983-07-13

1985-04-02

Leung, Philip H.

Electric heating

Metal heating

Of cylinders

219 1055F, 219 1055C, 219 1055R, 219400, 126 21A, H05B 606, H05B 678

Patent

active

045089477

ABSTRACT:
A portable microwave oven is designed to be powered from a domestic power socket with a rating not exceeding 1800 watts for the U.S. market, or not exceeding 3000 watts for the U.K. market. The oven comprises a microwave generator for supplying microwave power to an oven cavity, a thermal heating element capable of heating the air within the oven cavity, a fan for forcing a recirculating flow of air over the heating element and in a continuous flow which within the oven cavity turns 180.degree. over and around food on a turntable rotating in a direction opposite to the air flow which is then reheated and recycled, and a control circuit operative to supply continuous microwave power to the oven cavity selectively simultaneously with or separate from the supply of thermal power to the cavity. The microwave power heats the inside of the food and the thermal power dissipates the resulting moisture and browns the external surface of the food. Due to the circulation of heated air being concentrated away from the cavity's walls, they remain relatively cool and following completion of cooking food, cooler air is circulated in the cavity to reduce its temperature so it can be used again in a relatively cool state for the introduction of additional food to be cooked and commence the cooking process at approximately the same temperature following each use. Opening the oven door secures the power to the microwave heating but not that to the thermal heating element.

REFERENCES:
patent: 2898437 (1959-08-01), McFarland
patent: 4196330 (1980-04-01), Payne
patent: 4308444 (1981-12-01), Takagi et al.
patent: 4309584 (1982-01-01), Terakami
patent: 4332992 (1982-06-01), Larsen et al.
patent: 4337384 (1982-06-01), Tanaka et al.

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