Spill-proof cup assembly with vented bottom

The cup assembly of claim 12, wherein said one or more vents dissipate a vacuum created as said fluid is withdrawn from said hollow body via said cap fluid dispensing outlet.

A cup assembly comprising:

• a hollow body having an upper end and a lower end;
• and
• a flexible membrane co-molded with said lower end of said hollow body and having one or more pressure actuated vents disposed therein.

The cup assembly of claim 19, wherein said flexible membrane enfolds said inner flange and fills said lower opening such that said one or more pressure actuated vents form a vent area for allowing air to flow through said lower opening into said hollow body while preventing a fluid contained in said hollow body from flowing through said lower opening out of said hollow body, thereby dissipating any vacuum created as said fluid is withdrawn from said hollow body via said cap fluid dispensing outlet.

A method of manufacturing a cup, comprising the steps of:

• injection molding a hollow body having an open upper end and a lower end with an inner flange;
• co-molding a flexible membrane with said lower end of said hollow body such that said flexible membrane enfolds said inner flange and fills said lower opening to define a vent area.