Oxygen-containing heterocyclic fused naphthopyrans

Details Oxygen-containing heterocyclic fused naphthopyrans Oxygen-containing heterocyclic fused naphthopyrans

2005-11-08

2005-11-08

Solola, Taofiq (Department: 1626)

Organic compounds -- part of the class 532-570 series

Organic compounds

Heterocyclic carbon compounds containing a hetero ring...

C549S384000

Reexamination Certificate

active

06963003

ABSTRACT:
This invention relates to novel naphthopyrans having an oxygen-containing heterocyclic group F annelated on the i, j, or k side of the naphthopyran ring, having certain substituents at the 2, 5, and 6 positions of the naphthopyran ring. These naphthopyrans may have the formula (I) presented below:These compounds (I) have interesting photochromic properties. Also related to this invention are host materials that contain such naphthopyran compounds, and articles such as ophthalmic lenses or other plastic transparencies that incorporate the naphthopyran compounds.

REFERENCES:
patent: 6630597 (2003-07-01), Lin et al.
patent: 6686468 (2004-02-01), Mann et al.

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