Compartmented flanged tray

Claim 1

A flanged tray for packaging, storing, heating and serving food prepared from a single blank of paperboard, said tray comprising multiple leakproof compartments with partitions between each adjacent pair of compartments, said flanged tray comprising: (a) a base panel for each compartment formed by opposed score lines: (b) upstanding side walls foldably attached to each base panel along said opposed score lines said side walls terminating at upper free edges wherein the adjacent walls of each pair of compartments are foldably attached to one another along their upper free edges to form partitions between each pair of compartments: (c) flap extensions foldably attached to the upper free edges of all side walls of each compartment except the tray walls which form each partition to provide a peripheral flange around the tray: (d) gusset panel corner closures foldably attached to the ends of said side walls at each corner of each base panel along paired score lines which extend from the intersection of said opposed score lines, said gusset panels being overlappingly bonded together and between said side walls to form leak proof corners for the respective compartments, said paired score lines being arranged at the gusset closures between the adjacent compartments to provide partition panels which extend substantially perpendicular from their respective base panels to lie in full face-to-face contact so that the paired compartments provide support for each other.