Design of an all plastic cryogenic storage chamber

Claim 1

A TANK OF LARGE CAPACITY ADAPTED FOR THE UNDERGROUND STORAGE OF A LIQUEFIED GAS COMPRISING: (A) A GENERALLY DOUGHNUT-SHAPED BODY INCLUDING AN OUTER ENCLOSURE CAPABLE OF SUPPORTING THE WEIGHT OF DIRT PLACED THEREON USED TO BURY THE TANK UNDER-GROUND, (B) A GENERALLY SIMILAR SHAPED STRUCTURALLY SELF-SUSTAINING INNER ENCLOSURE WITHIN SAID OUTER ENCLOSURE AND IN SPACED RELATION THERETO, (C) SAID INNER ENCLOSURE BEING FORMED OF A THERMALLY RESPONSIVE MATERIAL, SUCH AS RESIN IMPREGNATED GLASS FIBERS, WHICH IS CREPED SUBSTANTIALLY THROUGHOUT ITS SURFACE AREA WHEREBY SAID INNER ENCLOSURE IS ADAPTED TO ACCOMMODATE, ABSORB, AND DISTRIBUTE STRAIN OF CONTRACTION DUE TO TEMPERATURE DROP IN ALL DIRECTIONS SIMULTANEOUSLY, (D) A RESILIENT CELLULAR INSULATION IN A CONTACTING RELATION BETWEEN OPPOSED SURFACES OF SAID INNER AND OUTER ENCLOSURE AND UNDER COMPRESSION BETWEEN THE WALLS OF THE INNER AND OUTER ENCLOSURES, (E) WHEREBY SAID INSULATION EXPANDS TO MAINTAIN CONTACTING RELATION WHEN SAID INNER ENCLOSURE CONTRACTS, (F) MEANS COMMUNICATING WITH THE INTERIOR OF THE INNER ENCLOSURE AND EXTENDING THROUGH SAID OUTER ENCLOSURE PROVIDING ACCESS TO THE INNER ENCLOSURE FOR FILLING AND DRAINING THE SAME.