Blue 3H-naphtho[2,1-b]pyran compounds and use thereof in photochromic articles

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United States of America Patent

PATENT NO 7229989
APP PUB NO 20050096467A1
SERIAL NO

10945443

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Abstract

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Photochromic 3H-naphtho[2,1-b]pyran compounds corresponding to formula I ##STR00001## in which the groups R.sub.1 to R.sub.7 and B' have defined meanings and the use of such photochromic compounds in synthetic resin articles of all types, particularly for ophthalmic purposes. The photochromic 3H-naphtho[2,1-b]pyran derivatives have particularly long-waved absorption maxima in the open form, and when used in photochromic eyeglass lenses, produce essentially blue color tones which have a high darkening capacity.

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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
Mann, Claudia Munich, DE 16 175
Melzig, Manfred Wessling, DE 42 566
Weigand, Udo Munich, DE 28 188

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