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:
Feb. 28, 2017
Filed:
Nov. 13, 2013
Konica Minolta, Inc., Tokyo, JP;
Yuki Kaneko, Tokyo, JP;
Masataka Takimoto, Tokyo, JP;
Takashi Nanjiyou, Tokyo, JP;
Takahiro Takagi, Tokyo, JP;
Yuta Shimane, Tokyo, JP;
Masumi Nishimura, Tokyo, JP;
KONICA MINOLTA, INC., Tokyo, JP;
Abstract
The retardation film contains a cellulose ester, has a film thickness of 15 to less than 40 μm, has a film thickness variation both in the widthwise direction and lengthwise direction of 0 to 4 μm, and satisfies an Rt humidity fluctuation of 1% to 12%:(a difference of retardation(590) values in the thickness direction represented by the following formula (ii) measured at a wavelength of 590 nm after the film has been left to stand for 5 hours in each of a 23° C., 20% relative humidity environment and a 23° C., 80% relative humidity environment)/((590) value measured after the film has been left to stand for 5 hours in a 23° C., 55% relative humidity environment)×100(590)={()/2−  Formula (ii)wherein n: a refractive index in the slow axis direction in the film plane, n: a refractive index in the direction perpendicular to the slow axis in the film plane, n: a refractive index in the thickness direction of the film, and d: a film thickness.