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:
Dec. 07, 1993
Filed:
Apr. 02, 1992
Applicant:
Inventors:
Assignees:
Toyo Boseki Kabushiki Kaisha, Osaka, JP;
Nippon Magphane Co., Ltd., Tokyo, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
B29C / ;
U.S. Cl.
CPC ...
2642107 ; 2642884 ; 2642902 ; 528272 ; 528502 ; 528503 ;
Abstract
A biaxial oriented polyester film of the present invention has a density of 1.386 g/cm.sup.3 or more. A sum Y of the coefficients of the heat shrinkage in the machine direction and in the transverse direction of the film at a temperature of 150.degree. C. is 4.5% or more, and a sum X (kg/mm.sup.2) of F.sub.5 values in the machine direction and in the transverse direction of the film and the sum Y satisfy the following expression (I):