Method of making strip electrical coils

Claim 1

IN A METHOD OF MAKING STRIP ELECTRICAL COILS FROM AN ELECTRICALLY INSULATED STRIP OF ALUMINUM WHEREIN A CONTINUOUS DIELECTRIC COATING IS APPLIED TO AT LEAST ONE OF THE SIDES OF A RELATIVELY WIDE STRIP OF ALUMINUM AND SAID WIDE STRIP IS CUT INTO A PLURALITY OF RELATIVELY NARROW STRIPS WHICH ARE EACH BARE OF SAID COATING AT THEIR EDGE PORTIONS, THE IMPROVEMENT IN COMBINATION THEREWITH COMPRISING THE STEPS OF WINDING AT LEAST ONE OF SAID RELATIVELY NARROW STRIPS INTO A ROLL IN WHICH THE BARE EDGES OF THE NARROW STRIP ARE EXPOSED AT THE END FACES OF THE ROLL, APPLYING A SEALIANG COMPOUND TO AT LEAST THE EDGE PORTIONS OF THE STRIP ON AT LEAST ONE SIDE THEREOF AND LEAVING BARE THE EDGES OF THE STRIP WHEREBY THE COMPOUND PENETRATES AND SEALS THE TURNS OF THE ROLL, IMMERSING THE ROLL IN AN AQUEOUS ELECTROLYTIC BATH AND SUBJECTING IT TO ANODIC OXIDATION TO FORM A CONTINUOUS OXIDIC DIELECTRIC FILM ON SAID BARE EDGES WITH SAID SEALING COMPOUND MAINTAINING THE ROLL FREE FROM BLOCKING BY PREVENTING PENETRATION OF THE ELECTROLYTE BETWEEN THE TURNS OF THE ROLL, UNWINDING THE EDGE ANODIZED STRIP FROM THE ROLL, AND WINDING THE RESULTANT EDGE ANODIZED STRIP INTO A ELECTRICAL COIL.