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

Patent attributes

Current Assignee

Transitions Optical

Patent Jurisdiction

United States Patent and Trademark Office

Patent Number

7557208

Patent Inventor Names

Anil Kumar0

Robert W. Walters0

Clara E. Nelson0

Anu Chopra0

Date of Patent

July 7, 2009

Patent Application Number

12268653

Date Filed

November 11, 2008

Patent Primary Examiner

‌

Kamal A Saeed

Patent abstract

Described are naphthols useful in the manufacture of novel indeno-fused photochromic naphthopyran materials.

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