Gusseted corner carton

Claim 1

A CARTON COMPRISING AN OPEN-ENDED TUBULAR BODY HAVING A PLURALITY OF PANELS, A CLOSURE FLAP EXTENDING FROM THE END OF EACH BODY PANEL AND HINGEDLY CONNECTED THERETO BY A FOLD LINE, AND GUSSET-FORMING SHEET MATERIAL CAPABLE OF EXTENSION OVERLYING AND EXTENDING BETWEEN EACH PAIR OF ADJACENT FLAPS ON THE INSIDE OF SAID BODY ADJACENT SAID FOLD LINES, SAID MATERIAL BEING SECURED TO SAID FLAPS AT LOCALES SPACED LATERALLY INWARDLY OF ADJACENT FLAP SIDE MARGINS, SAID LOCALES DEFINING WITH SAID RESPECTIVE FLAP SIDE MARGINS FLAP PORTIONS IN UNDERLYING RELATION TO SAID SHEET MATERIAL, SAID FLAP PORTIONS HAVNG A RELEASE AGENT THEREON TO POSITIVELY PREVENT ADHERENCE OF SAID OVERLYING MATERIAL THERETO, WHEREBY UPON OUTWARD FOLDING OF SAID CARTON FLAPS, THE UNATTACHED PORTIONS OF SAID MATERIAL WILL SHREAD TO SPAN THE ANGULAR GAP AT THE CARTON CORNERS BETWEEN ADJACENT FLAPS THEREBY TO FORM A SUBSTANTIALLY PLANAR GUSSET TO WHICH A SEAL CAN BE EFFECTED IN FINAL CLOSING AND SEALING OF THE CARTON.