Membrane type storage tank

Claim 1

IN A MEMBRANE TANK FOR LIQUID STORAGE COMPRISING A RIGID HOUSING OF STRUCTURAL STRENGTH HAVING VERTICALLY DISPOSED WALLS, A BOTTOM WALL AND A TOP WALL DEFINING A STORAGE SPACE THEREBETWEEN, A THIN COLLAPSIBLE MEMBRANE CONTAINER OF FLUID AND VAPOR IMPERVIOUS MATERIAL SUPPORTED FROM THE UPPER EDGE PORTION FOR SUSPENSION WITHIN SAID STORAGE SPACE TO LINE THE WALLS OF SAID HOUSING AND AGAINST WHICH THE MEMBRANE RESTS IN RESPONSE TO LIQUID LOAD IN STORAGE WHILE REMAINING FREE THEREOF FOR RELATIVE MOVEMENTS RESPONSIVE TO EXPANSION AND CONTRACTION, THE IMPROVEMENT WHEREIN THE SAID MEMBRANE CONTAINER COMPRISES ELONGATE STRIPS OF SAID FLUID AND VAPOR IMPERVIOUS MATERIAL EXTENDING CONTINUOUSLY ACROSS THE BOTTOM WALL OF THE HOUSING AND UP OPPOSITE VERTICAL WALLS TO A LEVEL ABOVE THE LIQUID LEVEL AND IN WHICH THE STRIPS ARE ARRANGED IN SIDE-BY-SIDE RELATION WITH THE ADJACENT EDGES JOINED IN SEALING RELATION TO FORM A CONTINUOUS PANEL DIMENSIONED TO HAVE A WIDTH CORRESPONDING TO THE WIDTH OF SAID VERTICAL WALLS, AND OTHER ELONGATE STRIPS EXTENDING CONTINUOUSLY FROM THE BOTTOM WALL TO THE LEVEL OF THE LIQUID IN THE CONTAINER AND ARRANGED IN SIDE-BY-SIDE RELATIONSHIP WITH THE LATERAL EDGES JOINED IN SEALING RELATION TO FORM OTHER PANELS DIMENSIONED TO HAVE WIDTHS CORRESPONDING TO THE OTHERS OF SAID VERTICAL WALLS, WITH THE EDGES OF ONE PANEL BEING JOINED WITH THE EDGES OF ADJACENT PANELS IN SEALING RELATION TO DEFINE THE MEMBRANE CONTAINER THEREBETWEEN AND IN WHICH SAID STRIPS ARE OF DIMPLED CONSTRUCTION SUBSTANTIALLY THROUGHOUT THEIR AREA FOR EXPANSION AND CONTRACTION WITHOUT DIMENSIONAL CHANGE.