Glass manufacturing – Processes – With chemically reactive treatment of glass preform
Patent
1988-04-13
1989-08-08
Kratz, Peter
Glass manufacturing
Processes
With chemically reactive treatment of glass preform
65 323, 501 13, C03C 406, C03C 2100
Patent
active
048549576
ABSTRACT:
A metod for making a photochromic glass article exhibiting a surface color pattern wherein a silver halide-containing photochromic glass article is treated by exposing at least a portion of the surface thereof to a patterned heat source for a time sufficient to raise the temperature of at least a part of the exposed portion above about 450.degree. C., is described. The glass may be exposed to the patterned heat source either before or after thermal reduction coloring. Patterned heating to a temperature in the transformation range of the glass is used where a post-patterning thermal reduction coloration step is to be used, in order to render the glass resistant to reduction coloration in the patterned area.
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Borrelli Nicholas F.
Sachenik Paul A.
Corning Incorporated
Kratz Peter
VAN DER Sterre Kees
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