Insulated structure for use in transportation of cold liquids

Claim 1

A TANK FOR THE TRANSPORTATION AND STORAGE OF CRYOGENIC LIQUIDS AT TEMPERATURES FAR BELOW THE FREEZING POINT OF WATER COMPRISING (A) AN OUTER RIGID METAL HOUSING, (B) AN IMPERVIOUS SECONDARY WALL COMPRISING CONTINUOUS NON-METALLIC PANELS OF STRUCTURALLY STRON MATERIAL, (C) A PLURALITY OF INSULATING FIRRING SPACERS SECURED TO SAID SECONDARY WALL AND TO SAID HOUSING, SAID SPACERS MOUNTING SAID SECONDARY WALL ON THE INNER SURFACE OF SAID OUTER METALLIC HOUSING IN SPACED RELATION THERETO, (D) A PRIMARY THERMAL INSULATION BARRIER CONSISTING OF A LAYER OF INSULATING MATERIAL OF LOW THERMAL CONDUCTIVITY MOUNTED ON SAID SECONDARY WALL ON THE OPPOSITE SIDE FROM SAID SPACER MEMBERS AND SUPPORTED THEREBY, SAID PRIMARY LAYER AND SECONDARY WALL TOGETHER AS A UNIT BEING EFFECTIVE TO RESIST PENETRATION BY LIQUID COMING INTO CONTACT WITH THE INNER SURFACE THEREOF SO AS TO MAINTAIN THE LIQUID OUT OF CONTACT WITH THE OUTER METAL HOUSING, (E) A LAYER OF SECONDARY THERMAL POROUS INSULATING MATERIAL INCAPABLE OF RESISTING PENETRATION OF LIQUID COMING INTO CONTACT THEREWITH POSITIONED INWARDLY OF THE PRIMARY INSULATION LAYER AND ADJACENT THERETO, (F) A PANEL WALL SECURED TO BOTH PRIMARY AND SECONDARY LAYERS, SAID WALL SUPPORTING THE SAID LAYER OF SECONDARY INSULATING MATERIAL AS A LAYER ADJACENT THE PRIMARY INSULATION LAYER, (G) AND A PRIMARY CONTAINER OF LARGE CAPACITY WITHIN SAID METAL HOUSING, SAID INSULATION BEING BETWEEN SAID OUTER WALL HOUSING AND SAID PRIMARY CONTAINER.