Apparatus and method for controlling an electric heating...

Electric heating – Heating devices – Combined with container – enclosure – or support for material...

Reexamination Certificate

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Details

C219S490000

Reexamination Certificate

active

10500993

ABSTRACT:
In apparatus and a method for providing electronic control of an electric heating assembly, a radiant electric heater (10, 110) is arranged at a lower surface (22, 124) of a glass-ceramic cooking plate (12, 112), the plate having an upper surface (40, 138) for receiving a cooking vessel (42, 136A,136B). A temperature sensor (24, 140) monitors temperature at or adjacent to the cooking plate (12, 112) and provides an electrical output as a function of temperature. Control means (30, 142) connected to the temperature sensor (24, 140) and to the heater (10, 110) controls energising of the heater from a power supply (28, 134) for energising the heater at a plurality of user selectable power levels including a full power level. When the heater (10, 110) is energised at the full power level it is energised to heat the cooking plate (12, 112) to a first temperature level during a predetermined initial period (A) of 20 to 50 minutes and is thereafter (C) energised to heat the cooking plate to a second temperature level, lower than the first temperature level.

REFERENCES:
patent: 4347432 (1982-08-01), Gossler
patent: 4410795 (1983-10-01), Ueda
patent: 5293028 (1994-03-01), Payne
patent: 5961867 (1999-10-01), McWilliams
patent: 6018149 (2000-01-01), Higgins
patent: 29923976 (1999-12-01), None
patent: 0886459 (1998-12-01), None
International Search Report Jul. 1, 2003.

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