Method of making small to sub-miniature sizes of electric coils

Claim 1

A METHOD OF MAKING SMALL, MINIATURE AND SUBMINIATURE SELF-SUPPORTING RELAY COILS COMPRISING PROVIDING A BOBBIN OF DIELECTRIC MATERIAL HAVING A THICKNESS NOT IN EXCESS OF 0.006 INCH, SAID BOBBIN INCLUDING A TUBULAR CYLINDER AND SEPARATE END FLANGES EACH FLANGE INCLUDING A SLEEVE FITTED ONTO SAID CYLINDER, MOUNTING SAID BOBBIN ON A MANDREL HAVING BUTTRESS ELEMENTS FOR THE FLANGES OF SAID BOBBIN, RANDOM WINDING FINE WIRE PROVISIONALLY INSULATED WITH POLYTETRAFLUOROETHYLENE ONTO SAID BOBBIN WHILE ON SAID MANDREL, WITH THE WINDING RUNNING ONTO SAID SLEEVES FOR GRIPPING SAME AGAINST SAID CYLINDER IN FORMING THE COIL, THEN SUBJECTING SAID COIL WHILE RETAINED ON SAID MANDREL TO A DRY HEAT TREATMENT IN AN OVEN AT A TEMPERATURE ON THE ORDER OF 375* F. FOR A PERIOD OF NOT LESS THAN ONE HOUR TO REMOVE ANY OUT-GASSING SUBSTANCES FROM THE COIL, AS WELL AS TO RELIEVE THE COIL OF ALL INTERNAL STRESSES, THEREAFTER AND WHILE STILL ON THE MANDREL COOLING SAID COIL TO ROOM TEMPERATURE, THE HEATING AND COOLING EFFECTING ADHERENCE OF THE TURNS OF SAID COIL TO ONE ANOTHER WITHOUT FUSION THEREOF OR USE OF BONDING MATERIALS.