Method of impregnating a porous metal article

Claim 1

IN THE METHOD OF IMPREGNATING POROUS FERROUS PARTS WITH A PREDETERMINED QUANTIY OF CUPREOUS METAL, THE STEPS COMPRISING; MIXING A DESIRED QUANTITY OF CUPREOUS SATISFY THE DISSOLVING ACTION OF THE CUPREOUS METAL ON IRON, TOGETHER WITH FROM 1 TO 6% BY WEIGHT OF AN IMPALABLE REFRACTORY POWDER PLACING SAID MIKXTURE OF METALS AND REFRACTORY POWDER UPON SAID FERROUS PART TO BE IMPREGNATED, HEATING THE PART WITH SAID MIXTURE THEREON TO A TEMPERATURE ABOVE THE MELTING POINT OF THE CUPREOUS METAL IN SAID MIXTURE AND BELOW THE MELTING POINT FOR A TIME SUFFICIENT TO CAUSE SAID CUPREOUS METAL TO MELT AND TO DISSOLVE AT LEAST A PORTION OF THE FERROUS METAL MIXED THEREWITH WHILE SAID DISSOLVED METAL IS BEING RETAINED WITHIN KTHE MASS OF SAID REFRACTORY POWDER CONTINUING THE HEATING UNTIL THE MOLTEN COPPER WITH THE IRON DISSOLVED THEREIN FLOWS INTO THE FERROUS PART ADJACENT SAID MIXTURE, AND FINALLY REMOVING THE RSIDUE OF THE SAID MIXTURE FROM THE SURFACE OF SAID PART.