Frostless freezer

Claim 1

A FREEZER INCLUDING INSULATING WALLS AND A FRONT DOOR COMPLETELY ENCLOSING A COMPARTMENT GENERALLY IN THE SHAPE OF A RECTANGULAR PARALLELOPIPED TO BE KEPT BELOW WATER FREEZING TEMPERATURES AND CONTAINING A PLURALITY OF PERVIOUS SHELVES LOCATED AT DIFFERENT HEIGHTS, A FALSE TOP WALL LOCATED IN THE UPPER PORTION OF SAID COMPARTMENT PROVIDING AN UPPER CHAMBER, SAID INSULATING WALL INCLUDING AN UPRIGHT WALL PROVIDED SUBSTANTIALLY FROM ONE EDGE OF THE COMPARTMENT TO THE OTHER WITH A PLURALITY OF INDEPENDENT DUET MEANS EXTENDING UPWARDLY FROM LOCATIONS A SHORT DISTANCE ABOVE EACH SHELF TO AND CONNECTING WITH SAID UPPER CHAMBER AND EACH ADJACENT ITS BOTTOM HAVING A SEPARATE OPENING BELOW SAID FALSE TOP WALL FOR COMMUNICATION WITH SAID COMPARTMENT, A REFRIGERATING SYSTEM INCLUDING FIRST EVAPORATING MEANS IN HEAT TRANSFER RELATION WITH SAID COMPARTMENT BELOW SAID FALSE TOP WALL AND SECOND EVAPORATING MEANS LOCATED ABOVE SAID FALSE TOP WALL IN HEAT TRANSFER RELATION WITH SAID UPPER CHAMBER, SAID FALSE TOP WALL BEING ARRANGED TO PROVIDE INDEPENDENT GRAVITY AIR CIRCULATION BETWEEN SAID UPPER CHAMBER AND EACH OF SAID DUCT MEANS AND SAID COMPARTMENT ADJACENT EACH SHELF BENEATH SAID TOP WALL, SAID REFRIGERATING SYSTEM INCLUDING MEANS NORMALLY MAINTAINING BOTH SAID EVAPORATING MEANS AT BELOW FREEZING TEMPERATURES AND MEANS NORMALLY MAINTAINING SAID SECOND EVAPORATING MEANS AT TEMPERATURES SUBSTANTIALLY BELOW THE FIRST EVAPORATING MEANS FOR COLLECTING SUBSTANTIALLY ALL THE FROST THEREON SO AS TO PREVENT THE DEPOSIT OF FROST IN SAID COMPARTMENT BENEATH SAID TOP WALL.