Patent ID: 7923669

Claim:
A microwavable baking surface comprising: a baking substrate containing an aperture; a first sheet of an insulating microwave packaging material; and a second sheet of the insulating microwave packaging material; wherein the first sheet and the second sheet are arranged adjacent to each other and substantially cover the aperture, the insulating microwave packaging material includes a layer of microwave energy interactive material supported on a first polymer film, a dimensionally stable substrate joined to the layer of microwave energy interactive material, and a second polymer film joined to the dimensionally stable substrate in a patterned configuration that defines a plurality of closed cells between the dimensionally stable substrate and the second polymer film, and upon sufficient exposure to microwave energy, at least some of the closed cells inflate, and the first polymer film, the layer of microwave energy interactive material, and the dimensionally stable substrate bulge away from the second polymer film.