Electroless deposition of cobalt-ironphosphorous magnetic material

Claim 1

A METHOD OF EFFECTING THE ELECTROLESS DEPOSITION OF A FERROMAGNETIC ALLOY CONSISTING OF ABOUT 90% BY WEIGHT COBALT AND SUBSTANTIALLY EQUAL, MINOR AMOUNTS BY WEIGHT OF IRON AND PHOSPHORUS FROM AN ELECTROLESS PLATING SOLUTION ONTO A SURFACE OF A SUBSTRATE MADE UP OF POLYETHYLENE TEREPHTHALATE RESIN WHICH COMPRISES COATING SAID SURFACE OF SAID SUBSTRATE WITH A LAYER OF ADHESIVE MATERIAL, CONTACTING THE ADHESIVE COATED SURFACE WITH AN AQUEOUS PALLADIUM-CONTAINING SOLUTION, CONTACTING THE THUS-TREATING SURFACE WITH AN AQUEOUS SOLUTION CONTAINING A WATER-SOLUBLE SALT OF A METAL SELECTED FROM THE GROUP CONSISTING OF TIN AND TITANIUM AND CONTACTING THE RESULTING TREATED SURFACE OF SAID SUBSTRATE WITH AN AQUEOUS ELECTROLESS PLATING SOLUTION HAVING THE COMPOSITION 20-40 GRAMS PER LITER COBALT SULFATE, 40-80 GRAMS PER LITER AMMONIUM SULFATE, 100-600 GRAMS PER LITER ROCHELLE SALT, 10-30 GRAMS PER LITER SODIUM HYPOPHOPHITE, 0-1.5 CC. PER LITER OF 1.02.0 GRAMS PER LITER AQUEOUS SOLUTION OF POTASSIUM THIOCYANATE AND A MINOR AMOUNT IN THE RANGE ABOUT 1.5 GRAMS PER LITER OF FERROUS AMMONIUM SULFATE, SAID PLATING SOLUTION BEING EFFECTIVE TO ELECTROLESSLY DEPOSIT ON THE SURFACE A FERROMAGNETIC ALLOY CONSISTING ESSENTIALLY OF ABOUT 90% BY WEIGHT COBALT AND MINOR, SUBSTANTIALLY EQUAL AMOUNTS OF IRON AND PHOSPHORUS.