Patent ID: 6213324
Filing Date: 2001-04-10
Classification: B65D

Abstract:
A frangible closure, comprising:a closure sheet having a central weakness formed substantially through a medial portion of said closure sheet, said central weakness having a thickness and a central portion of greater thickness than the thickness of said central weakness so as to resist shearing of said central weakness; and,a lateral skirt surrounding said closure sheet, said lateral skirt and said closure sheet having at least a partial radial weakness therebetween for cooperating with said central weakness, said at least a partial radial weakness defining a channel comprising spatially separated hinge points for enabling said central weakness to collapse into said at least a partial radial weakness and preventing said closure sheet from separating from said lateral skirt when said closure sheet is under an applied pressure, said hinge points being molded into a top portion of said closure and having a thickness greater than the thickness of said at least a partial radial weakness.