US Patent 7480021 Optical films having reverse dispersion

Patent 7480021 was granted and assigned to Nitto Denko on January, 2009 by the United States Patent and Trademark Office.

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Is a

Patent

Patent attributes

Current Assignee

Nitto Denko

Patent Jurisdiction

United States Patent and Trademark Office

Patent Number

7480021

Date of Patent

January 20, 2009

Patent Application Number

11321345

Date Filed

December 29, 2005

Patent Primary Examiner

Frank G. Font

Patent abstract

This invention relates to an optical film comprising a first component having a birefringence dispersion of D1>1 and a second component having a birefringence dispersion of D2<1, wherein the birefringence ratio of the first and second component is delta n1/delta n2>0, wherein the optical film has a reverse birefringence dispersion of D<1.