General Electric Company

John E McMillan

John L Walter

James A Graves

John W Pugh

Francis W Pikus

Grant W Ticknor

George J Calevich

An electric lamp construction is described having at least one pair of conductive inlead wires of dispersion strengthened copper alloy to serve as the sole means of the physical support for a resistive incandescent filament physically connected thereto, and wherein one of said inlead wires is further electrically connected to a fuse lead of a copper solution alloy with nickel and tin. Said fuse metal produces less metal arc damage when melted during the lamp operation as compared with other fuse metals now in commercial use.

Electric lamp with external fuse lead

An improved inlead construction for an electric lamp is disclosed which utilizes an iron alloy containing sufficient silicon to avoid transformation of the inlead from the alpha ferrite phase to the gamma austenite phase at lamp operation temperatures. This precludes debilitating deformation of the inlead wires caused by on-off cycling of the lamp and concomitant cycling of the wire through the alpha to gamma transformation range. Such deformation can lead to structural or operational failure if the inleads become disconnected or electrically shorted from the resistive filament during lamp operation. In a preferred lamp construction, a pair of the improved inlead wires serve as the sole means of physical support for a resistive incandescent filament directly connected thereto and said inlead wires can further be coated with a dissimilar metal for higher lamp loading requirements in order to help avoid iron migration which can produce deterioration of the resistive incandescent filament.

Inlead construction for electric lamp

Dispersion strengthened copper leads are used for inner and/or outer leads in electric lamps.

Lamp leads

Apparatus is disclosed for forming foil leads by cross-rolling the round lead wire in successive passes through a roll press. In each pass, the lead wire is transported completely through the pinch area to form a foil having a lenticular cross section.

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Kirtland, OH, United States of America

John E McMillan