Abstract: A thin walled lid formed of a thermoplastic material having a generally circular center portion and an outer rim portion which fits over the cup bead and includes an integral peripheral skirt which makes up the outer side wall of the lid is disclosed. Located between the rim portion and the center portion is a recess or annular trough with an inner wall and an outer wall. The outer wall is separated into two shelves and three vertical sections. The lower shelf serves as a receiver ring upon which the lid above rests. The short vertical section located above the receiver ring effectively prevents any lateral movement of the lid above, while the lowest wall section forms the stacking ring and generally has a negative slope toward the lid skirt. Spaced periodically around the circumference of the stacking ring are positive draft flutes which have a positive slope away from the skirt and toward the center of the lid. The recess has a generally flat bottom which connects the stacking ring to the inner wall.

Abstract: A lid for a plastic food container includes a continuous body portion and a continuous rim encompassing and projecting laterally outwardly from the body portion. The body portion includes a peripheral region, a transition region, and a central region. The peripheral region encompasses the transition region and the central region, extends between the continuous rim and the transition region, and slopes downward at a first acute angle from the continuous rim to the transition region. The transition region encompasses the central region, extends between the peripheral region and the central region, and includes first and second transition portions. The first transition portion intersects the peripheral region and slopes upward at a second acute angle from the peripheral region to the second transition portion. The second transition portion intersects the central region and slopes upward at a third acute angle from the first transition portion to the central region.

Abstract: A set of different sized container assemblies, each container assembly consisting of a container and a matching lid, are disclosed in which same size containers nest, same size containers stack, and each smaller size container assembly is received within a larger container assembly, each lid having generally downwardly depending flange means which are radically spaced to receive the upper wall portion of an associated container, the assembly including cam means which assist in the assembly of a container to its associated lid.

Abstract: A container lid, adapted for use with a cold or hot drink, is provided with a condiment reservoir built into the lid. An orifice for drinking a liquid in the container is provided on one side of a planar surface forming the lid and an open top recess, forming the condiment reservoir, is provided on the other side. Closed side walls and a bottom extending down toward the container serve to form the reservoir. The condiment can be carried directly in the reservoir or in a condiment holder, such as a packet or cup, placed in the reservoir. The side walls extend at an acute angle from the planar surface to allow multiple lids to nest together prior to use. A mating groove and annular projection in the recess and on a cup, respectively, serves as a snap fit interlock system to hold the cup in place. The side walls of the recess include a semicircular wall and a diagonal wall connecting the ends to form the reservoir.