US Patent 7557208 Naphthols useful for preparing indeno-fused photochromic naphthopyrans
Patent 7557208 was granted and assigned to Transitions Optical on July, 2009 by the United States Patent and Trademark Office.
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Patent Inventor Names
Anil Kumar0
Anu Chopra0
Clara E. Nelson0
Robert W. Walters0
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Patent abstract
Described are naphthols useful in the manufacture of novel indeno-fused photochromic naphthopyran materials.
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US Patent 07557208 Naphthols useful for preparing indeno-fused photochromic naphthopyrans US Patent 7557208 Naphthols useful for preparing indeno-fused photochromic naphthopyrans
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Patent Number
07557208
Patent Number
7557208
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US Patent 07557208 Naphthols useful for preparing indeno-fused photochromic naphthopyrans
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Is a
Current assignee
Patent jurisdiction
Patent number
07557208
Date of patent
July 7, 2009
Patent application number
12268653
Date Filed
November 11, 2008
Patent primary examiner
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