The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Sep. 15, 2009
Filed:
Aug. 24, 2005
Masaki Hayashi, Osaka, JP;
Naoki Koishi, Osaka, JP;
Masahiro Hata, Osaka, JP;
Shuuji Yano, Osaka, JP;
Masaki Hayashi, Osaka, JP;
Naoki Koishi, Osaka, JP;
Masahiro Hata, Osaka, JP;
Shuuji Yano, Osaka, JP;
Nitto Denko Corporation, Ibaraki-shi, JP;
Abstract
A retardation film which hardly causes shift or unevenness in retardation values and which has a refractive index profile of nx>nz>ny (that is, 0<Rth[590]/Re[590]<1) is provided. A retardation film according to an embodiment of the present invention comprises a stretched polymer film containing a styrene-based resin and a polycarbonate-based resin, which satisfies the following expressions (1) and (2):100 nm≦Re[590]≦350 nm  (1)0.2≦Rth[590]/Re[590]≦0.8  (2)