Photochromic plastic lens and its method of manufacture
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United States of America Patent
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Jun 22, 1999
Grant Date -
N/A
app pub date -
Apr 11, 1997
filing date -
Apr 12, 1996
priority date (Note) -
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Abstract
The invention provides a commercially feasible method of manufacturing a photochromic lens on a large scale. The method involves vacuum depositing a photochromic material onto a surface of a plastic lens to form a photchromic depositied lens, and heating the photochromic deposited lens for a time and at a temperature sufficient to allow the photochromic material to permeate the lens.
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