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:
May. 23, 2017
Filed:
Dec. 20, 2011
Applicants:
Hironari Sudeji, Tokyo, JP;
Taku Hatano, Tokyo, JP;
Inventors:
Hironari Sudeji, Tokyo, JP;
Taku Hatano, Tokyo, JP;
Assignee:
ZEON CORPORATION, Tokyo, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G02B 5/30 (2006.01); B29C 55/02 (2006.01); B29D 11/00 (2006.01); B29C 55/14 (2006.01); B32B 27/08 (2006.01); B32B 27/30 (2006.01); G02F 1/13363 (2006.01);
U.S. Cl.
CPC ...
G02B 5/3083 (2013.01); B29C 55/023 (2013.01); B29C 55/143 (2013.01); B29D 11/0073 (2013.01); B29D 11/00644 (2013.01); B32B 27/08 (2013.01); B32B 27/302 (2013.01); B29K 2995/0032 (2013.01); B32B 2307/42 (2013.01); B32B 2551/00 (2013.01); G02F 1/133634 (2013.01); G02F 2001/133635 (2013.01); G02F 2201/38 (2013.01); G02F 2202/40 (2013.01); G02F 2413/11 (2013.01); G02F 2413/12 (2013.01); G02F 2413/13 (2013.01); G02F 2413/14 (2013.01);
Abstract
By provision of an A layer consisting of a resin having a positive intrinsic birefringence value; a B layer consisting of a resin containing a styrene polymer and having a negative intrinsic birefringence value; and a C layer consisting of a resin containing a polymer having an alicyclic structure, in this order; a phase difference film wherein, when the C layer is removed, retardation Re at an incident angle of 0° and retardation Rat an incident angle of 40° satisfy a relationship of 0.92≦R/Re≦1.08 is realized.