Patent ID: 7048154

Claim:
A closure for use in combination with a flexible container for a pourable viscous fluid, the container having a dispensing opening for pouring the fluid from the container and the closure being secured to the periphery of the dispensing opening so as to cover the opening, characterized in that: said closure comprises a membrane having a primary vent orifice in the region over said dispensing opening and a plurality of at least three part lines through said membrane, said primary vent orifice being sized to permit said membrane to breathe; said part lines having proximal ends spaced about, and terminating in, said primary vent orifice, and said part lines extending outward from said vent orifice substantially to said periphery; each said part line being interrupted by a small connecting element extending thereacross proximate to said primary vent orifice; and wherein said primary vent orifice and said connecting elements have sufficiently small size, and said connecting elements are positioned sufficiently close to said primary vent orifice, that said membrane will contain said viscous fluid within said container when said container is brought into inverted position for pouring, yet said connecting elements will break away and said membrane will separate along said part lines when said flexible container is squeezed, thereby enabling said viscous fluid to flow through said dispensing opening.