Cooking vessel bottom and production method therefor
AssigneeTVS S.p.A.
InventorRino Gambini
Life of this patent
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Abstract
Flat cooking-vessel bottom the outer surface of which is provided with equidistant concentric grooves in the form of circles and coated with two overlying layers the first of which is in contact with the metal and consists of a material with, high radiation heat absorption capacity distributed uniformly over the entire bottom surface and the second layer consists of an enamel or silk-screen paste resistant to abrasion and scratching distributed nonuniformly and preferably in segments and only on the lands between the surface grooves.
Claims14
A flat cooking vessel bottom (2) made of aluminum or an aluminum alloy, said bottom having side walls (3), said bottom having an external surface, said external surface being provided with concentric grooves (6) and lands (7) in the form of equidistant circles, said grooves being formed on said external surface by removal of portion of said aluminum or aluminum alloy from the bottom of said vessel, said grooves and lands being coated uniformly with a first layer (9) which is in contact with the aluminum or aluminum alloy, has a dark color and a dull surface and consists of a porcelain enamel based on an alkaline borosilicate having high radiation heat absorbing capacity, said external surface has a second layer (10), applied to the first layer, said second layer having high abrasion and scoring resistance and consisting of a porcelain enamel based on an alkaline borosilicate to which a hardening agent is added, said second layer (10) being applied only on the lands (7) discontinuously in segments.
A flat cooking vessel bottom (2) made of aluminum or an aluminum alloy, said bottom having side walls (3), said bottom having and external surface, said external surface being provided with concentric grooves (6) and lands (7) in the form of equidistant circles, said grooves being formed on said external surface by removal of portion of said aluminum or aluminum alloy from the bottom of said vessel, said grooves and lands being coated with two overlying layers, a first layer (9) being in contact with the aluminum or aluminum alloy, having a dark color and a dull surface and consisting of a porcelain enamel based on an alkaline borosilicate having high radiation heat absorbing capacity, and a second layer (10), applied to the first layer, having high abrasion and scoring resistance and consisting of a porcelain enamel other than said porcelain enamel which constitutes the first layer, said second layer containing a hardening agent, said second layer (10) being applied only on the lands (7) discontinuously in segments.
Dependencies are inferred from the claim text.