Patent ID: 7740789

Claim:
A method of making a cup used in cup stacking competitions comprising: providing a mold having: a core that defines an inner surface of the cup, a cavity spaced a distance from the core that defines an outer surface of the cup, the space between the core and the cavity defining a volume to receive a material, a stripper plate positioned adjacent to the core and below the cavity, the stripper plate having an annulus that defines a lip of the cup and a protrusion positioned within the annulus that defines a recess in the lip; wherein the core includes a second annulus in corresponding relationship to the annulus of the stripper plate, the annulus and the second annulus defining the lip, and wherein a second protrusion is located within the second annulus, the protrusion and second protrusion defining the recess, introducing the material into the volume to form the cup; removing the cavity; transitioning the stripper plate with respect to the core thereby disengaging the cup from the core.