Electric heating – Metal heating – Of cylinders
Patent
1986-01-02
1987-04-28
Leung, Philip H.
Electric heating
Metal heating
Of cylinders
219 1055E, 99325, 426243, 426523, H05B 668
Patent
active
046616705
ABSTRACT:
A microwave oven has a magnetron for producing microwave power and a resistance heating element over which air is forced by a fan to produce a forced flow of hot air through the oven cavity. A thermistor in the hot air flow senses the temperature of the hot air. Microwave power and hot air are produced simultaneously until the sensed hot air temperature reaches a predetermined threshold temperature (T1). For baked food items this represents the end of the cooking process, but for meat items there is a final cooking stage during which no hot air is forced through the cavity, the level of microwave power being doubled during the final stage. The end of the final stage occurs when the sensed temperature drops to a predetermined threshold (TS). The absence of forced hot air during the final stage makes the detection of the predetermined threshold temperature (TS) easier, because the slope of the hot air temperature/time curve is steeper than would be the case if hot air were produced to the end of the cooking process.
REFERENCES:
patent: 4309584 (1982-01-01), Terakami
patent: 4345134 (1952-08-01), Tanaka et al.
patent: 4463238 (1984-07-01), Tanabe
patent: 4508947 (1985-04-01), Eke
patent: 4582971 (1986-04-01), Ueda
Albright Penrose Lucas
Leung Philip H.
Microwave Ovens Limited
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