Easy-opening ring and plug closure

Claim 1

AN EASY-OPENING RECLOSABLE CLOSURE FOR A CONTAINER, SAID CLOSURE COMPRISING A SEAL CAP INCLUDING AN ANNULAR END PORTION, A TOP CORNER RADIUS PORTION AND A SKIRT PORTION HAVING A CORRUGATED EDGE STRUCTURE, SAID SKIRT PORTION BEING CONNECTED TO SAID END PORTION BY SAID TOP CORNER RADIUS PORTION; A PULL TAB EXTENDING INWARDLY OF SAID END PORTION; SCORE LINE EXTENDING FROM SAID PULL TAB ACROSS A SECTION OF SAID END PORTION, SAID TOP CORNER RADIUS PORTION AND SAID SKIRT PORTION TO DEFINE A TEAR STRIP; A SEALING DISC COMPRISING A CLOSURE PANEL, A SKIRT AND A HEM, SAID SKIRT BEING CONNECTED TO SAID HEM AND SAID CLOSURE PANEL, LOCKING MEANS ON SAID SKIRT FOR ENGAGING THE UNDERSIDE OF AN INWARDLY ROLLED CONTAINER LIP FOR RESILIENTLY HOLDING SAID DISC IN SAID CONTAINER, SAID LOCKING MEANS COMPRISING A PLURALITY OF NIBS CIRCUMFERENTIALLY SPACED AROUND SAID SKIRT ADJACENT TO SAID CLOSURE PANEL, SAID HEM BEING SUBSTANTIALLY U-SHAPED IN CROSS-SECTION AND INCLUDING A TOP LEG SECTION AND A BOTTOM LEG SECTION CONNECTED BY A RESILIENT BIGHT PORTION FOR PROVIDING SEALING COMPRESSION WHEN SAID CORRUGATED EDGE STRUCTURE OF SAID SKIRT PORTION IS CRIMPED BENEATH A LOCKING RING OF SAID CONTAINER.