Electric heating – Heating devices – With power supply and voltage or current regulation or...
Reexamination Certificate
2006-09-12
2006-09-12
Paschall, Mark (Department: 3742)
Electric heating
Heating devices
With power supply and voltage or current regulation or...
C219S497000, C219S481000
Reexamination Certificate
active
07105781
ABSTRACT:
Apparatus and a method are provided for detecting an abnormal rise in temperature associated with a combination of a cooking utensil (10) and a cooking zone (8) of a cooking surface (4) overlying an electric heater (6). The apparatus has a first temperature-responsive device (24) is provided within the heater and adapted to monitor temperature of the cooking surface (4). A second temperature-responsive device (26) is provided within the heater and adapted to monitor temperature of the cooking utensil (10) through the cooking surface (4) to provide an electrical output as a function of temperature of the cooking utensil. Means (28) is provided for calculating first and second derivatives (D1,D2) with time of the temperature sensed by the second temperature-responsive device (26) over an operating temperature range of the heater. Means (28) is provided to determine stabilization of the first derivative (D1) within stabilizing threshold limit values. Means (28) is provided to thereafter compare the first and second derivatives (D1,D2) with first and second predetermined threshold values and to detect an abnormal rise in temperature when the first and second predetermined threshold values are exceeded.
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Davis Frederick James
Pearce Isobel
Swann Neil
Wilkins Peter Ravenscroft
Ceramaspeed Limited
Dorman Ira S.
Paschall Mark
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