Apparatus and process for producing a gradient photochromic opht

Details Apparatus and process for producing a gradient photochromic opht Apparatus and process for producing a gradient photochromic opht

1976-11-08

1978-02-07

Kellogg, Arthur D.

Glass manufacturing

Processes

With chemically reactive treatment of glass preform

65103, 65111, 65269, 65288, C03B 3200

Patent

active

040724905

ABSTRACT:
A gradient photochromic ophthalmic lens blank is produced by heat treating an ophthalmic lens blank composed of potentially photochromic glass at a temperature sufficient to develop photochromic properties therein, while maintaining in proximity to a portion of the lens blank a metal heat sink with a specified heat absorbing capacity. The metal heat sink acts to provide a temperature gradient across the ophthalmic lens blank during heating, which gradient is effective to provide a gradient in photochromic properties thereacross.

REFERENCES:
patent: 3250246 (1966-05-01), Stilley et al.

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