Patent ID: 7556163

Claim:
A molded, plastic closure exhibiting enhanced column strength, comprising: a top wall portion; and an annular skirt portion depending from said top wall portion, said skirt portion including an internal thread formation, said skirt portion defining an array of alternating, circumferentially spaced grooves and lands which together define a plurality of circumferentially spaced strengthening ribs on an inside surface of said skirt portion, to thereby enhance the column strength of said closure, said circumferentially spaced grooves extending beneath and being spaced from said internal thread formation, each of said grooves having a circumferential dimension greater than a circumferential dimension of each of said lands, said skirt portion of said closure defining a plurality of circumferentially spaced gripping knurls on an exterior surface thereof, wherein said gripping knurls are respectively aligned with said circumferentially spaced grooves defined by the interior surface of said skirt portion.