Step gradient photochromic glass body and process

Details Step gradient photochromic glass body and process Step gradient photochromic glass body and process

1984-12-18

1986-09-30

Schor, Kenneth M.

Glass manufacturing

Processes

With chemically reactive treatment of glass preform

501 13, C03C 406

Patent

active

046145303

ABSTRACT:
A step gradient photochromic glass body is produced by illuminating a selected region of a photochromic glass during isothermal heat treatment with light of a specified energy and intensity while shielding the rest of the glass. The regions of glass exposed to this light during heat treatment are arrested in the development of their photochromic properties, while those regions which are simultaneously shielded from light develop their photochromic properties normally. The light gradient across the glass body during heat treatment is effective to provide a similar gradient in photochromic properties thereacross.

REFERENCES:
patent: 3617316 (1971-11-01), Suzuki
patent: 3725028 (1973-04-01), Cramer
patent: 4148661 (1979-04-01), Kerko

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