Patent ID: 7319213

Claim:
A microwave packaging material comprising: a laminate material including a substrate and a microwave interactive material layer supported upon the substrate; and a plurality of indentations in the laminate material, wherein the indentations are at least partially defined by the microwave interactive layer and substantially maintain the integrity of the microwave interactive layer, wherein a first side of the microwave interactive layer faces away from the substrate and includes a plurality of substantially flat, coplanar surfaces that are at least partially separated from one another respectively by the indentations, for each of at least some of the indentations (a) the indentation includes a convex portion defined by the first side of the microwave interactive layer, and (b) the convex portion extends above the substantially flat, coplanar surfaces of the first side of the microwave interactive layer while the substantially flat, coplanar surfaces are facing upward, a first side of the substrate faces away from the microwave interactive layer and includes a plurality of substantially flat, coplanar surfaces that are at least partially separated from one another respectively by the indentations, a thickness is defined between (a) the substantially flat, coplanar surfaces of the first side of the microwave interactive layer, and (b) the substantially flat, coplanar surfaces of the first side of the substrate, for each of the at least some of indentations, the convex portion extends a maximum distance above the substantially flat, coplanar surfaces of the first side of the microwave interactive layer, and the maximum distance is less than the thickness.