Photochromic 3H-naphtho[2,1-b]-pyran compounds and photochromic articles produced therewith
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United States of America Patent
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Nov 22, 2005
Grant Date -
Dec 30, 2004
app pub date -
Jul 2, 2004
filing date -
Jan 3, 2002
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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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