Pouring spout construction

Claim 1

A PAPERBOARD CARTON HAVING A SYMMETRICAL DEFORMABLE SECTION FORMED ON TWO WALLS THEREOF WHICH MEET AT A CORNER, SAID DEFORMABLE SECTION COMPRISING A RECLOSABLE UPPER SPOUT PANEL AND A LOWER TRIGGER PANEL, THE SPOUT PANEL BEING SEPARABLE FROM SAID WALLS BY SLITS ALONG ITS MARGINS TO PROVIDE A POURING OPENING, THE TRIGGER PANEL BEING HINGEDLY CONNECTED TO SAID WALLS BY HINGE LINES, AND HINGEDLY CONNECTED TO THE SPOUT PANEL ALONG A V-HINGE LINE EXTENDING FROM THE MARGINS OF THE DEFORMABLE SECTION AND HAVING ITS APEX ON THE CORNER OF THE CARTON, WHEREBY INWARD DEFORMING PRESSURE ON SAID TRIGGER PANEL ACTS TO EXTEND SAID SPOUT PANEL IN SUBSTANTIALLY V-SHAPED FORMATION OUTWARDLY FROM SAID ADJOINING WALLS TO DEFINE SAID POURING OPENING, A PAPERBOARD LINING ADHESIVELY ATTACHED JUXTAPOSED TO THE PORTION OF THE WALLS OF THE CARTON IN THE AREA OF SAID DEFORMABLE SECTION AND HAVING MARGINAL PORTIONS UNDERLYING SAID WALLS JUST OUTSIDE THE SAID HINGE LINES OF THE TRIGGER PANEL AND OTHER MARGINAL PORTIONS JUTTING BENEATH AND BEYOND THE SLITS DEFINING THE SPOUT PANEL THEREBY TO PROVIDE LIPS LIMITING THE SAID POURING OPENING AND TO BRACE THE WALLS IN THAT AREA AGAINST INWARD PRESSURE ON SAID TRIGGER PANEL.