Patent ID: 8602248
Filing Date: 2013-12-10
Classification: A47J,Y10T

Abstract:
1. A cooking utensil that is adapted for use with an induction cooktop having a cooktop surface and an induction heating coil, the cooking utensil comprising: an inner wall comprising an innermost wall and a ferromagnetic target that is in thermal contact with the innermost wall, where the target is adapted to be heated by induction; an outer wall comprising an electrically non-conductive material; wherein the inner and outer walls are spaced from one another except at a joint location where they are coupled together, to thereby define a gap between the inner and outer walls; wherein the inner wall defines a bottom portion located closest to the cooktop surface during operation of the induction heating coil and a sidewall portion located farther from the cooktop surface during operation of the induction heating coil, wherein the outer wall defines a bottom portion located on the cooktop surface during operation of the induction heating coil and a sidewall portion spaced above the cooktop surface during operation of the induction heating coil; and a thin, solid, generally annular intermediate wall in the gap and not in direct contact with the target, the intermediate wall dividing the gap into an inner closed chamber between the inner wall and the intermediate wall and an outer closed chamber between the outer wall and the intermediate wall, wherein the outer chamber extends along the outer wall for at least most of the length of the sidewall portion of the outer wall, and wherein the intermediate wall prevents the flow of heated gas from the inner chamber into the outer chamber and has a relatively low thermal conductivity to inhibit heat transfer along the length of the intermediate wall.