Removable plug closure with pull loop

Claim 1

A CLOSURE ARRANGEMENT FOR ONE END OF A CYLINDRICAL, PAPERBOARD CAN, COMPRISING, IN COMBINATION: (A) AN ANNULAR, METAL CLOSURE RING HAVING AN OUTSIEE PERIPHERAL EDGE PERMANENTLY ATTACHED TO AN END EDGE OF SAID CAN AND HAVING AN INSIDE PERIPHERAL FLANGE, GENERALLY L-SHAPED IN CROSS-SECTION, DEFINING A CIRCULAR, CENTRAL OPENING AND INCLUDING: (I) AN ANNULAR WALL PRESENTING A FLAT, OUTWARDLY FACING SURFACE; (II) A CYLINDRICAL WALL PROJECTING INWARDLY FROM THE INSIDE EDGE OF SAID ANNULAR WALL AND AHVING, AT ITS FREE INNER EDGE, AN INWARDLY FLARED, PERIPHERAL LIP EXTENDING INTO SAID OPENING; (B) A FLEXIBLE, PLASTIC, CIRCULAR, CLOSURE PLUG REMOVABLY POSITIONED WITHIN THE OPENING OF SAID CLOSURE RING AND INCLUDING: (I) A GENERALLY FLAT, CIRCULAR WALL; (II) A CYLINDRICAL WALL PROJECTING OUTWARDLY FROM THE OUTSIDE EDGE OF SAID CIRCULAR WALL AND DEFINING THEREWITH A CYLINDRICAL RECESS; (C) SAID CLOSURE PLUG CYLINDRICAL WALL HAVING: (I) AN ANNULAR SHOULDER PROJECTING LATERALLY OUTWARD FROM ITS FREE EDGE AND PRESENTING A FLAT, INWARDLY FACING SURFACE ADAPTED TO SEAT ON THE OUTWARDLY FACING SURFACE OF SAID CLOSURE RING ANNULAR WALL; (II) AN ANNULAR RETAINING BEAD SPACED AXIALLY INWARD FROM SAID SHOULDER TO DEFINE THEREBETWEEN AN ANNULAR CHANNEL FOR RECEIVING SAID RING CYLINDRICAL WALL; (III) SAID RETAINING RING CYLINDRICAL WALL LIP HAVING AN INSIDE DIAMETER SLIGHTLY LESS THAN THE OUTSIDE DIAMETER OF SAID CHANNEL SO THAT WHEN THE PLUG IS POSITIONED WITHIN THE RING THE LIP WALL DIG INTO THE RING CYLINDRICAL WALL IN SAID CHANNEL TO EFFECT A FLUID TIGHT SEAL THEREBETWEEN; (IV) SAID BEAD PRESENTING AN OUTWARDLY INCLINED SURFACE ADAPTED TO FACILITATE ENTRY OF SAID RING LIP INTO SAID PLUG CHANNELF (D) A RELATIVELY NARROW, THIN, FLEXIBLE PULL LOOP DISPOSED IN SAID PLUG RECESS AND HAVING ITS ENDS FORMED INTEGRALLY WITH THE CYLINDRICAL WALL OF SAID PLUG ON ONE SIDE OF THE CENTER THEREOF SPACED APART A DISTANCE SUBTANTIALLY LESS THAN THE DIAMETER OF THE PLUG AND CURVING BETWEEN ITS ENDS THROUGHOUT AN ANGLE SUBSTANTIALLY IN EXCESS OF 180*.