US PATENT SUBCLASS 219 / 447.1
.~.~.~.~ Responsive to presence of material (e.g., food, a cooking vessel, etc.)

Current as of: June, 1999
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219 /   HD   ELECTRIC HEATING

200  DF  HEATING DEVICES {14}
385  DF  .~ Combined with container, enclosure, or support for material to be heated {12}
443.1  DF  .~.~ Exposed horizontal planar support surface for material to be heated (e.g., hot plate, etc.) {13}
446.1  DF  .~.~.~ Having sensor {2}
447.1.~.~.~.~ Responsive to presence of material (e.g., food, a cooking vessel, etc.)

DEFINITION

Classification: 219/447.1

Responsive to presence of material (e.g., food, a cooking vessel, etc.):

(under subclass 446.1) Subject matter wherein the sensor detects the condition of the material which is present on the exposed horizontal planar support surface.