US Patent 8474634 Child resistant closure with vents

A child resistant closure having an outer cap and an inner cap each of which has a base wall on a peripheral skirt with sets of lugs on the inner surface of the outer closure member and on the outer surface of the inner closure member which are adapted to be engaged when the members are moved axially toward one another. The outer surface of the inner cap is provided with a plurality of vents to allow for increased evacuation of fluid between the inner and outer cap.