Patent ID: 8313004

Claim:
A one piece metallic end closure adapted for double seaming to a container, comprising: a peripheral curl having a first end and a second end, said first end adapted for interconnection to a neck of the container; a chuck wall comprising an upper wall portion interconnected to said second end of said peripheral curl and a lower wall portion extending inwardly and below said upper chuck wall portion; a countersink having an outer panel wall interconnected to said lower wall portion of said chuck wall, and an inner panel wall extending upward and inwardly, said countersink further defined by a first radius of curvature below said outer panel wall and a second radius of curvature below said inner panel wall; an inclined, substantially linear panel wall interconnected on a lower end to said upper end of said countersink inner panel wall with a radius of curvature of about 0.021 inches, and interconnected on an upper end to a substantially circular center panel with a vertical center axis, said inclined, substantially linear panel wall oriented at an angle between about 30 and 60 degrees with respect to said vertical axis and having a substantially uniform thickness.