Insulated shipper container

Claim 1

IN AN INSULATED SHIPPER CONTAINER, A LOAD SUPPORTING INSULATING BASE, AN INSULATING EXPANDABLE, CONTRACTABLE WALL EXTENDING UPWARDLY FROM THE BASE, ENCOMPASSING AND DEFINING A COLD STORAGE ZONE CLOSED AT THE BOTTOM BY THE BASE, THE WALL INCLUDING INNER AND OUTER MEMBRANES EXTENDING UPWARDLY FROM THE BASE, DEFINING A GAS TIGHT INSULATION CHAMBER, EXPANDABLE, CONTRACTABLE, INSULATING MATERIAL SUBSTANTIALLY FILLING THE CHAMBER, A VALVED AIR DUCT INTO THE CHAMBER, THE WALL BEING FREE TO COLLAPSE UNDER ATMOSPHERIC PRESSURE, LATERALLY AWAY FROM THE CONTENTS OF THE ZONE AND DOWNWARDLY TOWARD THE BASE, WHEN AIR IS WITHDRAWN FROM THE CHAMBER THROUGH THE VALVE AIR DUCT, AND TO REMAIN COLLAPSED WHILE THE DUCT IS CLOSED, THE INSULATION IN THE CHAMBER BEING OF INTER-CELLULAR, FOAMED, ELASTOMERIC PLASTIC MATERIAL, HAVING A MEMORY WHICH CAUSES IT WHEN RELEASED AFTER DISTORTION TO RESUME ITS ORIGINAL SIZE AND SHAPE, THE INNER MEMBRANE AT ITS TOP BEING OUTWARDLY FLARED TO DEFINE A DOWNWARDLY TAPERING ACCESS PORT BOUNDING THE UPPER END OF THE STORAGE ZONE, A RIGID DOOR FRAME ENCIRCLING SAID PORT AT THE TOP OF THE WALL, AN EXPANDABLE, CONTRACTABLE DOOR, MEANS FOR REMOVABLY ATTACHING IT TO THE DOOR FRAME TO HOLD IT IN POSITION TO CLOSE THE PORT.