Cooking surfaces of glass-ceramic plates with layers with different values for radiation transmission
AssigneeJenaer Glaswerk Schott & Gen.
InventorHerwig Scheidler
Life of this patent
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Abstract
A glass-ceramic plate cooking surface comprises a glass-ceramic base layer which allows penetration of thermal radiation having a wave length of from 0.7 to 5 microns and a top covering layer smaller in thickness than the base layer which is tightly joined to the base layer and absorbs the radiation with wave lengths of 0.7 to 5 microns. The glass-ceramic plate cooking surface can have the heating areas indicated by design and can be provided with an additional layer to avoid asymmetric stress and strengthen the cooking surface.
Claims16
A glass-ceramic cooking plate for use with heating elements on the underside of the plate, the heat energy from the heating elements being transmitted through the plate to the upper surface of the plate, said plate comprising a glass-ceramic base layer having a high transmittance value for radiation whose wave length is from 0.7 to 5 microns and a covering layer smaller in thickness than the base layer, tenaciously adhered to the top of the base layer, said covering layer absorbing substantially all radiation with wave lengths of 0.7 to 5 microns transmitted the base layer.
A glass-ceramic cooking plate horizontally disposed for use with heating elements on the underside of the plate, the heat energy from the heating elements being transmitted through the plate to the upper surface of the plate, said plate comprising a glass-ceramic base layer having a transmittance value of greater than 80% for radiation whose wave length is from 0.7 to 2.0 microns and a covering layer of at most one-tenth the thickness of the base layer tenaciously adhered to the top of the base layer, the covering layer having a transmittance value of less than 20% for radiation whose wave length is from 0.7 to 2 microns.
Dependencies are inferred from the claim text.