Incorporating photochromic molecules in light transmissible articles
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United States of America Patent
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Sep 28, 1999
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N/A
app pub date -
Sep 8, 1997
filing date -
Dec 16, 1994
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Abstract
A light-transmissible article formed from a polymeric material, which article includes at least one photochromic dye; and a compatible light absorbing material distributed on or within the article; the combination of photochromic dye and compatible light absorbing material is such that the depth of darkening upon activation of photochromic dye is rendered substantially uniform regardless of variations in length, thickness or local changes of surface shape.
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