No-spill drinking cup apparatus

CAFC
  • US 6,321,931 B1
  • Filed: 08/22/1998
  • Issued: 11/27/2001
  • Est. Priority Date: 08/21/1997
  • Status: Expired due to Term
First Claim
Patent Images

1. An apparatus for use in a no-spill drinking cup, said apparatus comprising:

  • a valve holder, such valve holder comprising at least one valve and a blocking element, said valve comprising a flexible material, said blocking element comprising an area of material which is impenetrable to the flow of liquid, said valve further comprising an opening through said flexible material, said valve having a resting position wherein said flexible material sits with said opening against said blocking element such that said valve is closed to the passage of liquid through said valve, said valve moving into an open position for the passage of liquid through said valve upon the application of negative air pressure to the top of said valve, said open position being a position wherein said flexible member comprising said opening lifts off of said blocking element.

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