Gte Products Corporation

Gte Sylvania Incorporated

Naila Saba Jirmanus

Andre C Bouchard

John Francis Waymouth

Thomas J Sentementes

An electrically-activated photoflash lamp which includes a glass envelope, combustion-supporting (e.g. oxygen) atmosphere, a quantity of filamentary combustible material (e.g. zirconium), and an ignition means including a pair of spaced leads sealed within the envelope and a primer mass for igniting the combustible material. The primer mass includes a first quantity of substantially non-ignitable primer material having a second quantity of highly ignitable primer material located thereon. Use of the first primer material permits pulsing of the lamp in air prior to application of the second primer material to thereby assure uniform ignition voltages between lamps similarly treated. A circuit utilizing a plurality of the above lamps and a method for producing said lamps are also disclosed.

Photoflash lamp, method of making same, and photoflash circuit

A photoflash lamp having a glass envelope with an inner layer or coating of a material selected to have a low thermal conductivity and diffusivity for minimizing heat losses during the collision of molten droplets of combustible metal with the inner wall of the envelope during flashing. In this manner, radiative energy losses resulting from the droplet-wall collisions are minimized and light output is improved.

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Somerville, MA, United States of America

Naila Saba Jirmanus