Patent ID: 8485374

Claim:
A plastic closure, comprising: a top wall portion; an annular skirt portion depending from said top wall portion, and a tamper-evident band depending from and at least partially detachably connected to said skirt portion of said closure, said annular skirt portion including a compound, internal helical thread formation, wherein said thread formation includes an upper retention portion extending continuously about the interior of the closure through about 360 degrees, and further includes a lower guide portion, extending helically from said retention portion toward an open end of said skirt portion, said internal thread formation being positioned above said tamper-evident band, said lower guide portion of said thread formation having a smaller cross-sectional area than a cross-sectional area of said upper retention portion of said thread formation, wherein said lower guide portion of said thread formation defines a plurality of circumferentially spaced interruptions to promote the venting of gas from within an associated container to which said closure is applied.