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:
Sep. 28, 1999
Filed:
Mar. 05, 1997
Kei Mizutani, Sagamihara, JP;
Hideaki Watanabe, Sagamihara, JP;
Teijin Limited, Osaka, JP;
Abstract
A biaxially oriented polyester film for a magnetic recording medium, which is formed from a polyester composition comprising at least one member of fine particulate agglomerates selected from the group consisting of alumina fine particulate agglomerates and fine particulate agglomerates of a composite oxide comprising alumina and other metal oxide(s) in a proportion of 0.05 to 1% by weight of the polyester, the fine particulate agglomerates having an average particle diameter of 0.005 to 0.5 .mu.m and having been surface-treated with an alkali metal salt of a polyvalent carboxylic acid; and other inert fine particles different from the above fine particulate agglomerates and having an average particle diameter of 0.2 to 2.0 .mu.m in a proportion of 0.05 to 5% by weight of the polyester; and a biaxially oriented laminate polyester film for a magnetic recording medium comprising a polyester film layer of the above polyester composition as at least one surface layer.