Photoflash lamp

Details Photoflash lamp Photoflash lamp

1975-03-31

1976-03-30

Dority, Jr., Carroll B.

Combustion

Projector and igniter for liquid or gelled fuel slug or rod,...

F21K 502

Patent

active

039472256

ABSTRACT:
A photoflash lamp having an envelope comprised of a lead-containing glass having a low coefficient of thermal expansion and a pair of filament-supporting lead-in wires secured to the glass envelope by means of a graded seal having a lead-free intermediate expansion glass disposed between the envelope and lead-in wires. The lead-in wires are composed of an iron-nickel-cobalt alloy. The intermediate expansion glass may be in the form of a bead having its midportion between the lead-in wires stretched to protrude toward the filament to prevent post-ignition short circuits.

REFERENCES:
patent: 3506385 (1970-04-01), Weber et al.
patent: 3771941 (1973-11-01), Audesse et al.
patent: 3832124 (1974-08-01), Loughridge et al.
patent: 3897196 (1975-07-01), Saunders et al.

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