US Patent 7481955 Photochromic materials comprising metallocenyl groups
Patent 7481955 was granted and assigned to Transitions Optical on January, 2009 by the United States Patent and Trademark Office.
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Various non-limiting embodiments of the present invention relate to photochromic materials having a metallocenyl group. More particularly, various non-limiting embodiments disclosed herein provide photochromic materials including an indeno-fused naphthopyran, such as an indeno[2′,3′:3,4]naphtho[1,2-b]pyran, and a metallocenyl group bonded to at least one available position on the indeno-fused naphthopyran. Other non-limiting embodiments disclosed herein provide photochromic composition and photochromic articles, such as but not limited to ophthalmic lens, which include the disclosed photochromic materials and method of making the same.
US Patent 07481955 Photochromic materials comprising metallocenyl groups US Patent 7481955 Photochromic materials comprising metallocenyl groups
US Patent 07481955 Photochromic materials comprising metallocenyl groups
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