Patent ID: 8205477

Claim:
A metallic end closure adapted for interconnection to a sidewall of a container body, comprising: a peripheral cover hook; a chuck wall extending downwardly from said peripheral cover hook; a countersink comprising an outer panel wall interconnected to a lower end of said chuck wall and an inner panel interconnected to a substantially planar central panel, said countersink comprised of a metallic material having a substantially uniform thickness not adapted to fail; and a channel with a predetermined geometric profile positioned in at least one of said inner panel or said outer panel of said countersink, said channel defining a gap between said inner panel wall and said outer panel wall at said channel, wherein said gap spans a distance that is less than a distance between said outer panel wall and said inner panel wall in a lower portion of the countersink, and wherein said gap spans a distance that is between about 0.005 and 0.070 inches.