Container for frozen product

Claim 1

A CONTAINER FOR CONFINING A NORMALLY LIQUID PRODUCT IN A FROZEN STATE, THE COMBINATION COMPRISNG: (A) AN EXTERIOR BOX OF PAPERBOARD HAVING OPPOSED INTERCONNECTED PAIRS OF PARALLEL MAJOR AND MINOR SIDE WALLS, AND OPPOSED PARALLEL TOP AND BOTTOM WALLS; (B) EACH MAJOR SIDE WALL OF THE BOX HAVING APPROXIMATELY EQUAL HORIZONTAL AND VERTICAL DIMENSIONS, AND EACH MINOR SIDE WALL OF THE BOX HAVING A HORIZONTAL DIMENSION THAT IS APPROXIMATELY ONE-HALF THAT OF THE MAJOR SIDE WALL; (C) AN INTERIOR BAG OF A PLASTIC FILM MATERIAL DISPOSED WITHIN THE PAPERBOARD BOX AND SUPPORTED BY THE SIDE WALLS THEREOF, AND CONFINING SAID PRODUCT; (D) SAID BAG BEING FILLED WITH LIQUID PRODUCT TO A HEIGHT RELATIVE TO THE BOX TO BELOW THE TOP WALL THEREOF, SO THAT THE LIQUID PRODUCT, WHEN SUBJECTED TO FREEZING CONDITIONS, CAN FREEZE INITIALLY ABOUT THE HORIZONTAL PERIMETER AND THEREAFTER FREEZE ALONG A VERTICALLY LOCATED CENTRAL CORE WHICH EXPANDS AS A PUMP AGAINST THE TOP WALL OF THE BOX.