Patent ID: 6626310
Filing Date: 2003-09-30
Classification: B29C,B29L,B65D,Y10S

Abstract:
A closure for connection to a container with a neck portion and an external helical thread formed on an outer surface of the neck portion, the closure comprising:an upper wall including a lower surface; a skirt formed integrally with and extending generally downwardly from the upper wall, the skirt having a skirt inner surface with an internal helical thread formed thereon for engaging the external helical thread of the neck portion to thereby secure the closure to the container; an inner annular seal extending generally axially downwardly from the upper wall to sealingly engage an inner surface of the neck portion, the inner annular seal having an inner seal apex area and a downwardly sloped surface extending generally downwardly and away from the upper wall to the inner seal apex area; and a gas barrier seal having an annular sealing bead positioned between the inner seal apex area and the upper wall inner surface for sealingly engaging the inner surface of the neck portion, with the downwardly sloped surface holding the annular sealing bead at least adjacent the lower surface of the upper wall, wherein the internal helical thread comprises: a crown spaced from the skirt inner surface; an upper thread surface extending generally upwardly and away from the crown to the skirt inner surface; and a lower thread surface extending generally downwardly and away from the crown to the skirt inner surface; wherein a cross sectional shape of the internal helical thread is asymmetrical with a length of the upper thread surface being greater than a length of the lower thread surface to thereby form an asymmetrical shape.