Patent ID: 6508379
Filing Date: 2003-01-21
Classification: A47G,B65D

Abstract:
A leak-free drinking beaker, comprising(a) a container, (b) a lid closing the container, (c) a drink passage opening into the interior of the container, and (d) a valve extending across the drink passage to control egress of liquid from the beaker and comprising: (i) a resiliently flexible valve element, (ii) a first valve seat, and (iii) a second valve seat separate from the first valve seat wherein the valve element and the first valve seat are cooperable to block fluid flow in a first direction and the valve element is cooperable with the second valve seat to block fluid flow in a second direction, said first direction being opposed to said second direction, and wherein, in a rest position said valve element blocks flow of fluid in both directions and can be resiliently flexed to open by a reduced pressure respectively downstream of the first or second valve seat to permit fluid flow in either the first or the second direction, wherein the flexible valve element comprises an annular membrane, wherein the membrane is a disc having a central hole and a first side and a second side, the first valve seat is located opposite the first side of the disc at the outermost rim of the disc and the second valve seat is located opposite the second side of the disc at the innermost rim of the disc.