Electric lamp and discharge devices – With luminescent solid or liquid material – With gaseous discharge medium
Reexamination Certificate
2005-07-19
2005-07-19
Guharay, Karabi (Department: 2879)
Electric lamp and discharge devices
With luminescent solid or liquid material
With gaseous discharge medium
C313S485000
Reexamination Certificate
active
06919679
ABSTRACT:
An electric lamp is provided having a luminescent layer on the lamp envelope that produces visible light when impinged by ultraviolet radiation generated within the lamp. An undercoat for the electric lamp increases the luminous efficacy of the lamp. The undercoat comprises a particulate non-fluorescent material derived from a sintered mixture of an aluminum oxide material and a getter material which reacts with contaminants present in the lamp.
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