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Nesting insulated hot-or-cold food tray

Image Number 2 for United States Patent #3938726.

An integral tray structure of expanded substantially rigid plastic foam material, typically polystyrene foam is formed to have a bottom plate surface, an upstanding surrounding, inclined rim and a laterally projecting flange formed on the rim, the flange having, around its periphery, spaced projections, and recess means which are so arranged that, upon inversion of a tray structure above another tray structure, a hollow, insulated chamber, to contain hot or cold food, is formed. The projecting and recess means can be used to lock the tray structures together, and the inclined rims permitting nesting of the tray structures within each other, for minimum space requirements of the tray structures themselves for transportation and storage. The projecting-recess means may be formed as tabs engaging notches, or perpendicularly projecting buttons engaging matching cut-outs.

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