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Home › 6-(biphenyl-ester)-3H-naphtho[2,1-b]pyrans as photochromic dichroic dyes and optical article containing them

6-(biphenyl-ester)-3H-naphtho[2,1-b]pyrans as photochromic dichroic dyes and optical article containing them

US Patent 8436184 · Granted May 7, 2013

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