Filtering of molten aluminum

Claim 1

IN THE FILTRATION OF MOLTEN ALUMINUM, THE METHOD COMPRISING: PROVIDING A POROUS CARBON FILTER PLATE IMPREGNATED WITH ALUMINUM AND HAVING A PROTECTIVE ALUMINUM PAD UPON AT LEAST ONE SURFACE THEREOF, PROVIDING A FILTERING CHAMBER ADAPTED TO BE PARTIONED BY SAID FILTER PLATE AND TO MAINTAIN THE EXPOSED SURFACE ON THE INTAKE SIDE OF THE SAID FILTER PLATE BELOW THE LEVEL OF THE MOLTEN ALUMINUM PASSING THERETHROUGH, INSERTING SAID IMPREGNATED FILTER PLATE WITH AT LEAST ONE PROTECTIVE PAD THEREON IN SAID FILTERING CHAMBER WITH AN ALUMINUM PAD FACING THE INLET SIDE OF SAID FILTER CHAMBER, PREHEATING SAID FILTERING CHAMBER AND IMPREGNATED FILTER TO A TEMPERATURE ABOVE 1000* F. BUT BELOW THE MELTING POINT OF THE SAID ALUMINUM PAD AND IMPREGNANT IN SAID CARBON FILTER PLATE, INTRODUCING MOLTEN ALUMINUM INTO SAID FILTERING CHAMBER TO MELT THE SAID ALUMINUM PAD AND IMPREGNANT, AND THEREAFTER PASSING MOLTEN ALUMINUM THROUGH THE SAID CARBON FILTER PLATE, THE SURFACE PORTION OF SAID CARBON FILTER PLATE EXPOSED TO THE MOLTEN METAL BEING MAINTAINED BELOW THE LEVEL OF SAID MOLTEN ALUMINUM.