Gte Sylvania Incorporated

Gte Products Corporation

Richard M Coppola

Martin P Schrank

Thomas J Sentementes

Eugene A Castello

Murthy S Ayyagari

A contrast enhanced electroluminescent device employs a chromium oxide-chromium cermet as the contrast enhancing material.

Contrast enhanced electroluminescent device

A dichroic coating is deposited on a cylindrical lamp envelope from an evaporation source while the envelope is heated and rotated. The thickness of the coating is monitored by measuring the intensity of light beamed on and reflected from a flat plate in line of sight with the evaporation source.

Method of coating lamp envelope with heat reflecting filter

A method of coating the glass envelope of a photoflash lamp with a thermoplastic material, the method comprising: preheating the glass envelope at a predetermined temperature for approximately one minute; immersing the heated envelope into a fluidized bed of powdered thermoplastic material from 1 to 5 seconds; removing the coated lamp from the fluidized bed; and postheating the coated envelope at a predetermined temperature for about 1 minute. To assist in preventing inadvertent flashing during these steps, the lamp can be held by a heat sink structure gripping the ignition leads or primer tube.

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Beverly, MA, United States of America

Richard M Coppola