Curvilinear window containers and blanks therefor

Claim 1

A WINDOW CONTAINER HAVING A SUBSTANTIALLY SEGMENTAL CROSS SECTION AND INWARDLY CURVED END WALL CLOSURE PANELS COMPRISING A FRAME OF RELATIVELY RIGID AND OPAQUE SHEET MATERIAL AND A WINDOW OF SYNTHETIC PLASTIC SHEET MATERIAL, SAID FRAME HAVING A BACK WAL PANEL, A COVER PANEL ARCHING OVER SAID BACK WALL PANEL PROVIDING SAID CONTAINER WITH A SUBSTANTIALLY SEGMENTAL CROSS SECTION, END WALL CLOSURE PANELS HINGEDLY CONNECTED TO THE ENDS OF SAID COVER PANEL ALONG INWARDLY POINTING ARCUATE FOLD LINES THE RADIAL DIMENSION FROM THE CENTER OF SAID ARCUATE FOLD TO THE FREE END WALL CLOSURE PANELS IN AN INWARDLY CURVING CONFIGURATION, AND A LOCKING PANEL UNDERLYING SAID BACK WALL PANEL WITH LOCKING FLAPS HINGEDLY CONNECTED AT THE END THEREOF, SAID COVER PANEL HAVING A WINDOW APERTURE THEREIN SPACED INWARDLY FROM THE ENDS THEREOF AND OF LESSER DIMENSION THAT SAID WINDOW, THE MARGINAL PORTIONS OF SAID COVER PANEL ADJACENT SAID APERTURE OVERLAPPING CORRESPONDING MARGINAL PORTIONS OF SAID WINDOW AND SAID WIDOW CONFORMING TO THE CURVE OF SAID COVER PANEL, SAID BACK WALL PANEL HAVING MEANS THEREON ENGAGED WITH SAID LOCKING FLAPS TO SECURE SAID CONTAINER IN ERECTED POSITION AGAINST THE BIASING PRESSURE OF SAID ARCHED COVER PANEL AND WINDOW.