Patent ID: 8901469

Claim:
A microwave heating apparatus, comprising: a tray and a cover hingedly joined to one another, wherein the tray and cover each comprise a susceptor film joined to paperboard, the susceptor film comprising a polymer film and a layer of microwave energy interactive material having a thickness of from about 60 to about 100 angstroms so that the layer of microwave energy interactive material is operative for absorbing microwave energy and generating heat, wherein the polymer film at least partially defines an interior surface of the tray and cover, so that the microwave energy interactive material is for being closely proximate to a food item within the apparatus, wherein the tray and cover each include a plurality of protrusions on an interior side of the tray and cover, and a plurality of indentations on an exterior side of the tray and cover, wherein the indentations on the exterior side of the tray and cover define the respective protrusions on the interior side of the tray and cover, and wherein for each protrusion of at least some protrusions of the plurality of protrusions: the indentation that defines the protrusion also defines a cavity the protrusion comprises a base end, an end opposite the base end, and a lateral surface extending completely around the cavity, the lateral surface extending from the base end of the protrusion to the opposite end of the protrusion, a portion of the susceptor film extends substantially continuously both around the protrusion and from the base end of the protrusion to the opposite end of the protrusion, comprising the lateral surface as a whole being substantially continuously covered by the portion of the susceptor film, so that the portion of the susceptor film extends substantially continuously around the cavity, and the portion of the susceptor film comprises both a portion of the polymer film and a portion of the layer of microwave energy interactive material having a thickness of from about 60 to about 100 angstroms.