C - Chemistry – Metallurgy – 03 – B
Patent
C - Chemistry, Metallurgy
03
B
96/76
C03B 32/02 (2006.01) C03B 32/00 (2006.01) C03B 35/20 (2006.01) C03C 4/06 (2006.01) C03C 23/00 (2006.01) G03C 1/494 (2006.01)
Patent
CA 1329038
Abstract of the Disclosure This invention is directed to a method for heat treating a sheet of a potentially photochromic glass to cause the growth of silver halide crystals therein which impart photochromic properties thereto, wherein the heat treated sheet will be essentially free from thermal deforma- tion and surface defects, and the photochromic properties exhibited therein will be essentially uniform across the area of the sheet. The method involves first placing a sheet of potentially photochromic glass on top of a sheet of carrier glass that exhibits a softening point at least 50°C higher than the temperature at which the potentially photochromic glass will be heat treated, and thereafter subjecting the stacked sheets to the heat treatment tempera- ture desired for growing silver halide crystals in the glass.
569872
Ball Edith Mary
Drake Patricia Ann
Kerko David Joseph
Corning Incorporated
Gowling Lafleur Henderson Llp
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