Self standing flanged tray with integral lid

Claim 1

A container for packaging, storing, displaying and heating food prepared from a single blank of flexible material such as coated paperboard to form an integral tray and lid comprising: (a) a base portion formed by opposed score lines in the blank material; (b) a plurality of upstanding tray walls foldably attached to said base portion along said opposed score lines; (c) a plurality of gusset panel corner closures foldably connected to said upstanding tray walls by paired score lines which emanate from the intersection of said opposed score lines, said gusset panels being overlappingly bonded together and between said upstanding tray walls; (d) a plurality of extensions foldably attached to all except one of said upstanding tray walls, the ends of which abut each other to form a peripheral flange; and, (e) an integral lid foldably attached to the remaining upstanding tray wall and adapted to overlap and be sealed to said peripheral flange to close said container, said lid including microcuts around the entire periphery thereof except in the region where the lid is joined to the remaining upstanding tray wall to permit the paperboard to delaminate from the lid to the peripheral flange when the container is opened, and a container opening tab located along an edge thereof remote from the connection of the lid to the said remaining upstanding tray wall for opening said container, the improvement wherein the paired score lines which connect the remaining upstanding tray wall to its adjacent tray walls are oriented to that one score line of each pair is a straight extension of the opposed score line between said base portion and said remaining upstanding side wall and the other score line of each pair diverges from the opposed score lines between said base portion and the adjacent tray walls to produce a tray in which all except said remaining upstanding tray wall are divergent with respect to said base portion which permits the tray portions of separate containers to be nested when empty and the sealed containers to be self standing along said remaining substantially straight and nondivergent upstanding tray wall for display after being filled and closed.