Substituted phenanthropyrans

Number of patents in Portfolio can not be more than 2000

United States of America Patent

PATENT NO 7229576
APP PUB NO 20060219990A1
SERIAL NO

11377357

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Abstract

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The present invention relates to specific photochromic phenanthropyrans as well as to their use in synthetic resin materials of all types, especially for ophthalmic purposes. In particular, the present invention relates to photochromic compounds derived from 2H-phenanthro[2,1-b]pyrans and 3H-phenanthro[3,4-b]pyrans, which in the open form have especially long wavelength absorption maxima, but in the unexcited state are still colorless.

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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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