Bag or bladder flexible at low temperatures

Claim 1

A TANK ADAPTED TO FEED LIQUID OXYGEN TO A COMBUSTION ZONE WITHOUT INTERRUPTION REGARDLESS OF THE POSITION OF THE TANK COMPRISING IN COMBINATION A RIGID CONTAINER HAVING A PRESSURIZING GAS INLET LINE EXTENDING ALMOST THROUGH THE INTERIOR OF SAID CONTAINER AND A LIQUID OXYGEN OUTLET LINE, PERFORATE CONDUIT MEANS FOR PASSING OUTLET LINE COMPRISING A PERFORATE CONDUIT EXTENDING ALONG THE INSIDE WALL OF SAID CONTAINER GENERALLY PARALLEL TO SAID GAS INLET LINE AND A RING CONDUIT EXTENDING AROUND THE INSIDE WALL OF SAID CONTAINER ADJACENT ONE END OF SAID PERFORATE CONDUIT, BOTH SAID CONDUITS BEING CONNECTED WITH SAID OUTLET, A BLADDER ENCLOSING THAT PORTION OF SAID INLET LINE WITHIN SAID CONTAINER IN SEALED RELATION THEREWITH, SAID BLADDER BEING CONSTRUCTED OF HYDROGENATED POLYMER OF THE GROUP CONSISTING OF HOMOPOLYMERS OF BUTADIENE AND COPOLYMERS OF BUTADIENE AND STRENE CONTAINING NOT MORE THAN 30 WEIGHT PERCENT STYRENE BASED ON THE WEIGHT OF THE MONOMERS, THE UNSATURATION OF SAID POLYMER BEING BELOW ABOUT 30% BASED UPON A THEORETICAL VALUE OF 100% FOR THE UNHYDROGENATED POLYBUTADIENE AND BEING SUBSTANTIALLY THE SIZE AND SHAPE OF SAID CONTAINER WHEN FILLED OUT, AND PERFORATIONS IN SAID PORTION OF LINE FOR PASSING FLUID INTO SAID BLADDER SO AS TO FILL OUT SAME AND EXPEL SAID LIQUID OXYGEN FROM SAID CONTAINER.