Patent ID: 7861874

Claim:
A container end for a container, said end comprising a neck portion forming a spout on a container body; said neck portion having a generally cylindrical part including an upper end with an opening having a surrounding seal surface defining a dispensing opening; circumferentially spaced neck lugs formed outward to a first diameter about said cylindrical part for cooperation with a closure cap, the neck lugs including a first set having a first conformation and a second set having a second conformation different than the first conformation; a removable closure cap adapted to cover said dispensing opening, said cap including a top panel and a cap rim shaped to extend downward from said top panel and adapted to surround said upper end of said neck, said cap rim terminating in a generally circular lower edge; a seal member within said cap on the underside of said top panel; a set of lugs formed inward within said rim of said cap to a second diameter less than said first diameter of said first and second sets of neck lugs to latch under said neck lugs and to retain said seal member in sealed relationship with said seal surface; said first set of neck lugs each having an upward extending ramp portion and a generally flat cam surface facing downward of said neck portion at the same spacing from said seal surface for compressing said seal member against said dispensing opening; and at least one second neck lug including a lower surface facing downward of said neck portion and a venting portion at a higher level than the lower surface, the venting portion further having a downturned end that extends to at least a level corresponding to the lower surface allowing at least one of said cap lugs to release from a neck lug and to free a segment of said seal member from the seal surface at least adjacent to the second neck lug, thereby initiating a venting path through said cap rim through which path relative pressure between the interior and exterior of the container is equated while said seal member and seal surface continue to be partially engaged.