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Leak-proof cup assembly with flow control element

  • US 6,422,415 B1
  • Filed: 02/04/2000
  • Issued: 07/23/2002
  • 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 seal said open end, said cap having a drinking spout and a mating surface, said mating surface being in fluid communication with said spout; and

    a valving element that has a stack, said stack being sized and configured to engage said mating surface and thereby place said stack in fluid communication with said spout, said stack 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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