Fuel tank anti-slosh device

Claim 1

IN A VEHICLE FUEL TANK COMPRISING GENERALLY RECTANGULAR UPPER AND LOWER SHEET METAL STAMPINGS, EACH DEFINING ONE GENERALLY HORIZONTAL WALL WITH SIDE WALLS EXTENDING GENERALLY NORMAL THERETO AND TERMINATING IN OUTWARDLY EXTENDING FLANGES SEALINGLY ABUTTING THE CORRESPONDING FLANGES OF THE OPPOSITE STAMPING, THE ADJACENT SIDE WALLS OF EACH SAID STAMPING MERGING WITH EACH OTHER TO DEFINE A GENERALLY ROUNDED CORNER AND A RESULTANT WIDENDING OF ITS FLANGE IN THE AREA LOCALLY OF SAID CORNER, AND A SHEET OF SOFT FLEXIBLE MATERIAL DISPOSED WITHIN SAID TANK, SAID MATERIAL BEING CHEMICALLY INERT TO AND OF LOWER SPECIFIC WEIGHT THAN LIQUID HYDROCARBON FUELS, SAID SHEET BEING OF SLIGHTLY LESS WIDTH AND LENGTH THAN THE CORRESPONDING INTERNAL LENGTH AND WIDTH OF THE TANK AND HAVING ONE EDGE THEREOF CLAMPED BETWEEN TWO ADJACENT WIDENED CORNER FLANGES OF SAID STAMPINGS, THE REMAINDER OF SAID SHEET BEING FREE TO FLEX WITH CHANGE IN LEVEL OF THE FUEL AND THEREBY CUSHION NOISE INCIDENT TO FUEL SLOSHING WITHIN THE TANK DURING VEHICLE OPERATION.