Fluorescent lamp having improved barrier layer

Details Fluorescent lamp having improved barrier layer Fluorescent lamp having improved barrier layer

2005-10-25

2008-09-23

Williams, Joseph L. (Department: 2889)

Electric lamp and discharge devices

With luminescent solid or liquid material

With gaseous discharge medium

C313S484000, C313S489000, C313S635000

Reexamination Certificate

active

07427829

ABSTRACT:
A mercury vapor discharge fluorescent lamp having a barrier layer and a phosphor layer. The barrier layer comprises yttria-coated alumina particles. The barrier layer is preferably at least 11 weight percent yttria. Preferably the yttrium-coated alumina particles are provided in an aqueous suspension and are then substantially separated from the dissolved salts therein before being combined into a coating suspension for coating the lamp.

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