Electric lamp and discharge devices – With gas or vapor – Incandescent filament lamp
Patent
1992-06-09
1994-08-09
Yusko, Donald J.
Electric lamp and discharge devices
With gas or vapor
Incandescent filament lamp
313112, 313489, 313579, 427106, H01K 126
Patent
active
053369696
ABSTRACT:
To reduce the transmissivity of glass, and particularly quartz glass, espally highly thermally loaded quartz glass of discharge lamps or halogen incandescent lamps, a coating or glaze is applied to the bulb and adjacent regions which includes, as an ultraviolet light absorption, a glaze of a mixture of cerium fluoride (CeF.sub.3) and aluminum trioxide (Al.sub.2 O.sub.3) and silicon dioxide (SiO.sub.2), in a relationship, by weight, of about 3:1, preferably about 2:1. The weight relationship of Al.sub.2 O.sub.3 to SiO.sub.2 in the mixture is about 1.7:1. The mixture can be applied in form of an alcohol or alcohol-like suspension, after grinding to a grain size of less than 300 mesh, by spraying, dripping on, painting or the like, subsequent drying for 10 seconds, and firing in a hydrogen/oxygen flame or in an ordinary gas flame for about 2 seconds, while axially rotating the lamp bulb.
REFERENCES:
patent: 2974052 (1960-07-01), Bacon et al.
patent: 3148300 (1961-08-01), Graff
patent: 3531677 (1970-09-01), Loughridge
patent: 5214345 (1993-05-01), Saito et al.
Deisenhofer Manfred
Weiss Werner
Patel Vip
Patent-Treuhand-Gesellschaft Fuer Elektrische Gluehlampen MBH
Yusko Donald J.
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