Vented closure

Claim 1

A molded plastic vented closure for a container having a molded plastic liner neck defining an opening comprising a plug for extending across an opening in a container, the plug including an upper end and comprising a body with a passage extending longitudinally therethrough, means on said body for connecting to the container across said opening; an integral flat disc extending across said passage longitudinally spaced apart from said upper end and having a plurality of apertures, the plug including a bottom end, and a porous relatively inert, easily damaged fluorocarbon flat cloth membrane of 3 micronmesh fabricated from fluorocarbon filaments associated with the closure below the disc and across said passage to permit venting of gasses therethrough and out said passage through the disc apertures into the ambient and preventing passage therethrough of a liquid, the membrane extends across the plug bottom end longitudinally spaced apart from said disc and being connected to the plug bottom with the plastic of the associated surfaces of the plug penetrating the pores of the engaged surface portion of the membrane thereby providing a mechanical bond between the associated surfaces of the plug and membrane, the disc protecting the membrane from rupture, and the vented closure including a cap for coupling with the neck defining the opening of the container, the cap including an inner and outer integrally connected concentric flange both of which have internal threads, the threads of the outer flange adapted to mesh with corresponding threads on the exterior of the neck of the container, the connecting means of the plug including external threads, and the threads on the inner flange mating with threads of the plug, and a radial lip on the top of the plug for sealing with the top of the cap and preventing the plug from being threaded too far into the cap.