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:
Jan. 16, 2018
Filed:
Nov. 16, 2011
Norikazu Yasutomo, Otsu, JP;
Norikazu Yasutomo, Otsu, JP;
KANEKA CORPORATION, Osaka-shi, Osaka, JP;
Abstract
A method for producing a stretched film comprising a first step of stretching a long film by increasing a holding distance in the width direction and a second step of shrinking by decreasing the holding distance in the width direction. One side edge of the long film has a traveling direction with at least three bending travels, while the other side edge has a traveling direction with at least two bending travels. The first step or the second step performs the bending travel at one or both of the side edges. The first step or the second step has a traveling trajectory in which the both side edges of the long film travel to the same side. The method achieves suppression of wrinkles formed on the stretched film, limitation of biaxiality of the stretched film, and provides a stretched film having optical properties suitably usable as a retardation plate.