Insulation coating and method of application thereof

Claim 1

THE METHOD OF PROVIDING AN INSULATING COATING TO SURFACES OF PORTIONS OF ELEMENTS OF ELECTRICAL MACHINES WHICH COMPRISES FLOWING OVER THE SURFACES A SLURRY OF SPECIFIC GRAVITY IN THE RANGE OF 35* TO 60* BAUME AND COMPRISED OF 50 TO 75 PARTS OF A LOWER FUSING 150 TO 250 MESH FRIT OF FUSION POINT OF ABOUT 800* TO 1200* F., 15 TO 35 PARTS OF A HIGHER FUSING 75 TO 150 MESH FRIT OF FUSION POINT 1400* TO 1600* F., 1 TO 10 PARTS SILICA, 1 TO 10 PARTS TABULAR ALUMINA, ALL PARTS BEING BY WEIGHT, SUSPENDED IN AN ORGANIC LIQUID VEHICLE OF BOILING POINT IN THE RANGE 50* TO 100* F., FOLLOWED BY STOPPING THE FLOW OF THE SLURRY AND PERMITTING THE VEHICLE TO EVAPORATE, FOLLOWED BY HEATING THE PORTION OF THE ELECTRICAL MACHINE TO A TEMPERATURE AT LEAST AS HIGH AS THE FUSION POINT OF THE LOWER FUSING FRIT TO CAUSE FUSION THEREOF, WITHOUT HEATING TO A TEMPERATURE TO EFFECT FUSION OF THE HIGHER FUSING FRIT.