Method and apparatus for coating electric lamp bulbs

Claim 2

APPARATUS FOR COATING PORTIONS OF THE INTERIOR OF A BULBOUS TUBULAR GLASS LAMP BULB OR THE LIKE EXCEPT THE UPPER TUBULAR PORTION WITH A FINELY DIVIDED COATING MATERIAL COMPRISING, MEANS TO ROTATE THE BULB ABOUT A GENERALLY VERTICAL AXIS ALONG ITS CENTER LINE, MEANS TO HEAT THE BULBOUS PORTION OF THE BULB TO BE COATED, A NOZZLE FOR INJECTING A SMOKE COMPRISING FINELY DIVIDED COATING MATERIAL SUSPENDED IN A GASEOUS MEDIUM UPWARD WITHIN SAID BULB AT THE LOWER END OF ITS BULBOUS PORTION WHILE IT IS BEING ROTATED AND HEATED, MEANS TO SUPPLY UNDER PRESSURE A SMOKE OF FINELY DIVIDED COATING MATERIAL TO SAID NOZZLE, OUTLET MEANS TO PERMIT THE ESCAPE FROM BENEATH THE BULBOUS PORTION WITHIN THE BULB OF EXCESS SMOKE CONTAINING COATING MATERIAL NOT ADHERED TO THE INTERIOR SURFACE OF THE LAMP BULB, MEANS TO APPLY A POTENTIAL DIFFERENCE BETWEEN THE SURFACE OF THE BULBOUS PORTION OF THE ROTATING BULB TO BE COATED AND SAID NOZZLE AS SAID CLOUD OF SMOKE IS INJECTED, AND DEFLECTION MEANS ADAPTED TO BE POSITIONED ABOVE SAID NOZZLE IN THE BULBOUS PORTION OF SAID BULB AND SPACED FROM THE SIDE WALLS THEREOF TO DEFLECT THE SMOKE FROM THE UPPER TUBULAR PORTION OF THE INTERIOR SURFACE OF THE ROTATING BULB TO BE COATED AS THE SMOKE IS INJECTED TO THEREBY PREVENT THE DEPOSITE OF COATING MATERIAL ON THE UPPER TUBULAR PORTION OF THE BULB.