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:
Jul. 18, 1995
Filed:
Jul. 26, 1993
Applicant:
Inventors:
Assignee:
Toyo Boseki Kabushiki Kaisha, Osaka, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
B32B / ; B32B / ; B32B / ; G11B / ;
U.S. Cl.
CPC ...
428329 ; 428323 ; 428328 ; 428331 ; 428480 ; 4286 / ; 4286 / ; 428910 ; 528279 ; 528280 ; 528282 ; 528283 ; 524444 ; 524492 ; 524493 ; 524497 ; 524442 ;
Abstract
A biaxially oriented polyester film of a polyester composed of an aromatic dicarboxylic acid as a major acid component and at least one glycol component, said polyester film containing 100-20000 ppm of a particulate compound oxide composed of two or more metals (selected from Al, B, Si, Ti, Zr, W, and Fe) and oxygen whose average primary particle diameter is 0.005-0.1 .mu.m. The compound oxide contains 0.1-5 wt % by weight of chlorine. The polyester film finds use as a base film for magnetic tape with improved scratch resistance.