Induction cookware
AssigneeBose Corporation
InventorsRaymond O. England, Thomas A. Froeschle, David W. Beverly
Life of this patent
Estimating the term…
Abstract
An induction cooking utensil is constructed such that it cooks food within its chamber while maintaining a relatively cool outer surface (e.g., preferably an outer surface that is cool enough to pick up with one's bare hands). The cooking utensil includes an inner wall that is made at least in part of an electrically conductive material and an outer wall that is made at least in part of the electrically non-conductive material. A reflective layer, a vacuum-sealed thermal insulator and/or a gas more resistant to conducting heat than air is disposed between the inner and outer walls to resist the transfer of heat from the inner wall to the outer wall.
Claims27
A cooking utensil for use with an induction cooktop having an induction coil, the cooking utensil comprising:
- an inner wall comprising an electrically conductive target layer in which heat is generated by the induction coil;
- an outer wall within which the inner wall is nested, the outer wall comprising an electrically non-conductive layer, wherein the outer wall cooperates with the inner wall to form a sealed gap between the inner wall and the outer wall and further cooperates with the inner wall to provide the cooking utensil a pan-like shape having a bottom portion wherein at least a portion of the electrically conductive target layer is disposed along a bottom portion of the inner wall;
- and
- a vacuum-sealed thermal insulator disposed within the gap within at least a portion of the bottom portion of the cooking utensil, wherein a surface of the vacuum-sealed thermal insulator faces towards and is spaced away from contact with the other surface the inner wall by a portion of the gap, wherein the vacuum-sealed thermal insulator is comprised of a thermally resistant material and a pair of sheets enclosing the thermally resistant material in a vacuum, and wherein the surface of the vacuum-sealed thermal insulator that faces towards the inner wall within at least the bottom portion comprises a sheet of the pair of sheets.
A cooking utensil for use with an induction cooktop having an induction coil, the cooking utensil comprising:
- an inner wall comprising an electrically conductive target layer in which heat is generated by the induction coil;
- an outer wall comprising an electrically non-conductive layer that cooperates with the inner wall to form a sealed gap between the inner wall and the outer wall;
- and
- a vacuum-sealed thermal insulator disposed within the gap, wherein a surface of the vacuum-sealed thermal insulator faces towards and is spaced away from contact with the outer surface the inner wall comprising the electrically conductive target layer, wherein the vacuum-sealed thermal insulator is comprised of a thermally resistant material and a pair of sheets enclosing the thermally resistant material in a vacuum, and wherein the surface that faces towards the outer surface the inner wall comprising the electrically conductive target layer comprises a sheet of the pair of sheets.
A method of making a cooking utensil, the method comprising:
- joining an outer wall comprising an electrically non-conductive layer to an inner wall comprising an electrically conductive target layer in which heat is able to be generated by an induction coil of an induction cooktop to define a gap between the inner wall and the outer wall such that the inner wall is nested within the outer wall and such that the inner wall and the outer wall cooperate to provide the cooking utensil with a pan-like shape having a bottom portion wherein at least a portion of the electrically conductive target layer is disposed along a bottom portion of the outer surface the inner wall;
- and
- disposing within the gap, with a surface that faces and is spaced away from contact with the inner wall within at least a portion of the bottom portion of the cooking utensil a vacuum-sealed insulator comprising a thermally resistant material and a pair of sheets enclosing the thermally resistant material in a vacuum, wherein the surface that faces the inner wall within at least a portion of the bottom portion of the cooking utensil comprises a sheet of the pair of sheets.
Dependencies are inferred from the claim text.