Patent ID: 7780033

Claim:
A plural chamber drinking cup comprising: a) an inner chamber with a bottom, a side wall, and a rim; b) an outer chamber with a bottom, an inner side wall, an outer side wall, and a rim; c) a lower chamber with a first side wall that is the outer chamber inner side wall and with a second side wall that is the inner chamber side wall; wherein, when the cup is in an upright position, the inner chamber rim is surrounded by the outer chamber and is disposed below the outer chamber rim; wherein the inner and outer chambers are capable of nesting at least about 75% based on height respectively within an inner chamber and an outer chamber of a second said cup when said cups are stacked; and wherein, along a vertical cross section of the cup cut in half, the inner chamber bottom and the inner chamber side wall together have matching interior and exterior surface outlines and the outer chamber bottom and the outer chamber side walls together have matching interior and exterior surface outlines to facilitate appreciable nesting.