Sealed package

Claim 1

A PAPERBOARD BOX COMPRISING A ONE PIECE BLANK HAVING ITS INNER SURFACE COATED WITH A THERMOPLASTIC MATERIAL, SAID BOX COMPRISING, FRONT AND BACK PANELS JOINED BY SIDE PANELS TO FORM A RECTANGULAR PARALLELEPIPED, SAID BOX HAVING CLOSING MEANS AT EACH END AS FOLLOWS: A RECTANGULAR INSIDE FLAP HINGED TO THE EDGE OF SAID FRONT PANEL AND A SEALING TAB JOINED ON A HINGE LINE TO THE EDGE OF SAID INSIDE FLAP, SAID SEALING TAB HAVING SIDE EDGES, SAID SEALING TAB HAVING AN EXCESS OF MATERIAL PROJECTING LATERALLY FROM ITS HINGE LINE TO FORM A CORNER SEALING AREA, A RECTANGULAR OUTSIDE FLAP HINGED TO THE EDGE OF SAID BACK PANEL, A GUSSET AT EACH SIDE OF SAID BOX, EACH GUSSET HAVING AT LEAST TWO TRIANGULAR PORTIONS: A FIRST HINGED ON THE EDGE OF A SIDE PANEL AND A SECOND JOINED BY A HINGE LINE ON THE SIDE EDGE OF SAID INSIDE FLAP, SAID PORTIONS BEING JOINED TOGETHER ALONG A DIAGONAL FOLD LINE, THE HINGE LINES OF SAID SEALING TAB AND SAID SECOND TRIANGULAR PORTION INTERSECTING AT A POINT LOCATED INWARDLY OF THE SIDE EDGE OF SAID SEALING TAB AND THE FREE EDGE OF SAID SECOND TRIANGULAR PORTION, SAID GUSSET BEING CONNECTED TO SAID OUTSIDE FLAP TO PROVIDE AN EXCESS OF MATERIAL EXTENDING OUTWARDLY BEYOND THE CORNER FORMED BY SAID FRONT PANEL, A SIDE PANEL AND SAID OUTER FLAP, SAID BOX, WHEN CLOSED, HAVING SAID INSIDE FLAP FOLDED ACROSS THE END OF SAID BOX WITH THE SEALING TAB HAVING ITS COATED SURFACE ENGAGING THE COATED SURFACE OF SAID OUTSIDE FLAP; WITH THE COATED SURFACES OF THE TRIANGULAR PORTIONS IN ENGAGEMENT WITH EACH OTHER; AND WITH THE COATED SURFACE OF THE PORJECTING MATERIAL OF THE SEALING TAB CONTACTING THE EXCESS MATERIAL AT SAID CORNER, SAID GUSSETS BEING INWARDLY FOLDED AND SAID OUTSIDE FLAP BEING FOLDED OVER SAID GUSSETS AND SAID INSIDE FLAP.