Photochromic 3H-naphtho[2,1-b]-pyran compounds and...

Details Photochromic 3H-naphtho[2,1-b]-pyran compounds and... Photochromic 3H-naphtho[2,1-b]-pyran compounds and...

2005-11-22

2005-11-22

Solola, Taofiq (Department: 1626)

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

Organic compounds

Chalcogen in the nitrogen containing substituent

C544S106000, C549S389000, C501S013000, C501S040000

Reexamination Certificate

active

06967249

ABSTRACT:
Specific photochromic 3H-naphtho[2,1-b]-pyran compounds useful with various types of synthetic resin materials to form photochromic articles, especially ophthalmic lenses, and photochromic articles formed with such compounds. The compounds of the invention have especially long-wave absorption maxima in the open form thereof and enable violet to blue tints to be obtained when used in photochromic articles.

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patent: 08 157467 (1996-10-01), None
patent: 08 176139 (1996-11-01), None
patent: 98 45281 (1998-10-01), None
patent: 01 12619 (2001-02-01), None

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