Electric heating – Heating devices – Combined with container – enclosure – or support for material...
Reexamination Certificate
2005-03-22
2005-03-22
Fuqua, Shawntina (Department: 3742)
Electric heating
Heating devices
Combined with container, enclosure, or support for material...
C219S518000, C219S446100, C219S448110, C219S468100, C219S483000
Reexamination Certificate
active
06870138
ABSTRACT:
An electric cooking hob having a plurality of heating elements distributed in matrix formation below a heat-resistant surface on which one or more cooking utensils can be located in random manner. The cooking hob can determine the location, form and dimensions of one or more cooking utensils positioned on the cooking hob. The cooking hob uses a signal source to determine which heating elements lie under the cooking utensil. The cooking hob can heat the elements lying below the cooking utensil by a power source. Each heating element being able to be energized with a polarity opposite to the polarity of the current used to perform the determination, so that the power source and the signal source can be applied at the same time to different heating elements.
REFERENCES:
patent: 3215817 (1965-11-01), Peek
patent: 6184501 (2001-02-01), Zapf
patent: 1206164 (2001-10-01), None
patent: 1206164 (2002-05-01), None
patent: MI200A000926 (2000-04-01), None
patent: WO 97-12298 (1997-04-01), None
Colligan John F.
Fuqua Shawntina
Krefmen Stephen
Rice Robert O.
Whirlpool Corporation
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