Tear open frozen food box

Claim 1

A BOX MADE OF SHEET MATERIAL HAVING SURFACES OF HEAT-SEALABLE PLASTIC COMPRISING A POLYGONAL BODY INCLUDING A PLURALITY OF SIDE PANELS MUTUALLY JOINED TOGETHER, AND ONE SIDE PANEL HAVING A CLOSURE PANEL WHICH OVERLAPS AN ADJACENT SIDE PANEL AND IS HEAT-SEALED THERETO, AND THE SIDE PANELS HAVING FLAPS AROUNT THEIR UPPER AND LOWER EDGES; INSERT PANELS FOR CLOSING THE UPPER AND LOWER ENDS OF THE BODY AND EACH HAVING FLANGE FLAPS AROUND ITS PERIPHERY BENT TO FACE OUTWARDLY OF THE BOX WHEN THE INSERT PANELS ARE INSERTED IN THE BODY, THE BODY FLAPS BEING BENT SUBSTANTIALLY 180 DEGREES WITH RESPECT TO THE BODY PANELS TO FORM OUTER EDGES OF THE BOX, AND SAID FLAPS OVERLAPPING THE FALNGE FLAPS AND BEING HEAT-SEALED THERETO; AND THE BODY FLAPS ON SAID ONE SIDE PANEL BEING JOINED TO THE LATTER PANEL ALONG LINES OF PERFORATIONS EXTENDING ALONG THE OUTER EDGES OF THE BOS TO FACILIATE TEARING OF SAID LATTER PANELS AWAY FROM THE BOX ALONG SAID LINES WHEREBY THE TORN EDGES AT THE PERFORATIONS ARE OFFSET FROM THE RESULTING APERTURE IN THE SIDE OF THE BOX BY THE HEIGHT OF A FLANGE FLAP.