Stainless steel cooking vessel suitable for all types of heat sources

Claim 1

A cooking vessel suitable for being heated by induction heating means, said vessel comprising: a base of austenitic stainless steel; a heat distributing layer bonded to the exterior of said base, said heat distributing layer being formed of a metal having a high thermal conductivity; a magnetizable layer connected exteriorly of said heat distributing layer, said magnetizable layer comprising a plate having a unitary, non-perforated and unbroken structure from the periphery of said plate to the center thereof, without ring-shaped division thereof; means for preventing separation of said magnetizable layer from said heat distributing layer during heating of said vessel, said means comprising at least two intermediate layers provided between and connecting said magnetizable layer and said heat distributing layer, each said intermediate layer being formed of a material having a coefficient of thermal expansion value between the values of the coefficients of thermal expansion of the materials of said heat distributing layer and said magnetizable layer, said coefficient of thermal expansion values of said materials of said intermediate layers being different, and one of said intermediate layers comprising a soldering or brazing alloy.