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Leak-proof cup assembly with flow control element

  • US 6,050,445 A
  • Filed: 02/06/1998
  • Issued: 04/18/2000
  • Est. Priority Date: 02/06/1998
  • Status: Expired due to Term
First Claim
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1. A drinking cup assembly, comprising:

  • a cup having an open end;

    a cap adapted to enclose said open end, said cap including a drinking spout, an air vent, an inside surface and a plurality of mating surfaces in communication with said inside surface, one of said plurality of mating surfaces being located adjacent or incorporated into said drinking spout and another of said plurality of mating surfaces being located adjacent or incorporated into said air vent; and

    a flow control valve including two stacks, each of said two stacks being adapted to engage a separate one of said plurality of mating surfaces and thereby place said flow control valve in fluid communication with said spout and said vent, each of said two stacks having a top portion with a concave valve face that extends substantially completely across said top portion and curves inwardly toward said stack.

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