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:
Apr. 09, 2002
Filed:
Dec. 20, 1999
Masaaki Otoshi, Shizuoka, JP;
Takanori Sato, Shizuoka, JP;
Yasuyuki Hosono, Shizuoka, JP;
Fumitaka Terai, Shizuoka, JP;
Kazuo Ozaki, Shizuoka, JP;
Fuji Photo Film Co., Ltd., Kanagawa, JP;
Abstract
The present invention improves the bowing phenomenon of a biaxially stretched polyester film which comprises stretching the longitudinally stretched cast film laterally at a temperature higher than the glass transition temperature of the polyester film from by 5° C. to by 50° C., staying the laterally stretched film in an intermediate zone for a period from 3 to 30 seconds which has been controlled at a temperature from higher than the lateral stretching temperature by 20° C. or more to lower than a heat setting temperature by 20° C. or less, and then heat-setting at the heat setting temperature which is lower than the melting point of the polyester film from by 30° C. to by 5° C.