Patent ID: 7128245

Claim:
A dispensing closure comprising: a closure body to be assembled to an opening of a container, said closure body defining a dispensing passage for communication between an interior and an exterior of the container through the opening of the container; and an automatic sealing valve disposed in said closure body across said dispensing passage, said valve opening in response to increased container pressure and automatically closing in response to released container pressure; (a) said closure body integrally comprising a cylindrical body for attachment to said container, a horizontal covering part extending inwardly from the top of said cylindrical body, a vertical covering part extending upwardly from the inner end of said horizontal covering part, and a top covering part extending inwardly from the upper end of said vertical covering part and protruding downwardly at its lower surface, which forms a generally tubular spout; and (b) said automatic sealing valve having a static member engaging in an inside space made by said horizontal covering part, vertical covering part and top covering part of said closure body, and a dynamic member being moved by pressure within said container between an open position and a closed position; wherein said static member comprises a horizontal part corresponding to said horizontal covering part and a vertical part corresponding to said vertical covering part, and said dynamic member comprises a flexible lateral part extending inwardly from the top of said vertical part and then bending downwardly, and an automatic sealing part extending inwardly from said flexible lateral part and having a central opening-closing slit; and the top surface of a connect portion between said vertical part and said flexible lateral part has a substantially V-shaped groove, and the thickness of said flexible lateral part is less than ⅓ of the thickness of said vertical part and simultaneously less than ⅓ of the thickness of the peripheral portion of said automatic sealing part, and the top surface of said automatic sealing part forms the shape of a reverse dome, and the outer, peripheral surface of said automatic sealing part slopes outwardly, downwardly at least 5° from its vertical axis.