Photochromic double-fused naphthopyrans

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United States of America Patent

PATENT NO 9151872
APP PUB NO 20140235876A1
SERIAL NO

14347009

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Abstract

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The present invention relates to photochromic double-fused naphthopyrans of the general formula (I) or (II) and the use thereof in plastics of all kinds, particularly for ophthalmic purposes. The photochromic compounds according to the invention are characterized by two distinct absorption bands of the open form in the visible wavelength range, i.e. two conventional photochromic dyes, each having only one discrete absorption band, can be replaced with dye molecules of this type. The compounds according to the invention, moreover, have a very good lifetime with a very high performance.

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Patent Owner(s)

Patent OwnerAddress
RODENSTOCK GMBHELSENHEIMERSTR 33 MÜNCHEN 80687

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Rohlfing, Yven München, DE 11 13
Weigand, Udo München, DE 28 188
Zinner, Herbert Rohrbach, DE 17 204

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