Neutral-color gray photochromic synthetic resin article
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United States of America Patent
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app pub date -
Aug 18, 2005
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Feb 19, 2003
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Abandoned
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Abstract
A neutral-color gray photochromic synthetic resin article which remains almost completely color-neutral or gray both during darkening as well as during fade. The synthetic resin article according to the invention may be employed as a neutral-color gray photochromic ophthalmic lens.
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