US Patent 7319211 Cooking utensil with bottom wall adapted for induction heating

A cooking utensil with bottom wall adapted for induction heating, is provided. The cooking utensil includes a container made from a first material that has attached to the outside of its bottom wall a heat distributing plate made from a second, different, heat conducting material, the outer surface having a series of spaced projections with the heat distributing plate being made up of a disc produced from ferromagnetic material provided with a number of perforations equivalent to the number of projections and appropriately distributed to allow the engagement of the disc, backed onto the bottom wall, by inserting the projections through the perforations, leaving the disc joined to the bottom wall by riveting the projections.