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. 21, 1992
Filed:
Oct. 12, 1989
Applicant:
Inventors:
Kazuo Endo, Yokohama, JP;
Nobuyasu Shudo, Yokohama, JP;
Chikakazu Kawaguchi, Atsugi, JP;
Yoshio Meguro, Tokyo, JP;
Masahiko Fujimoto, Yokohama, JP;
Toshifumi Takisawa, Tokyo, JP;
Masashi Inagaki, Machida, JP;
Assignee:
Diafoil Company, Limited, Tokyo, JP;
Primary Examiner:
Int. Cl.
CPC ...
G11B / ;
U.S. Cl.
CPC ...
428323 ; 428331 ; 428480 ; 428694 ; 428900 ;
Abstract
Disclosed herein is a polyester film containing specific fine spherical silica particles. The film of the present invention is especially suitable as a base film for a magnetic recording medium or dielectric for a capacitor. The films of the present invention have the markedly improved properties such as surface properties, electromagnetic properties, electrical properties, etc. due to the excellent dispersibility of the particles in the film.