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:
Jun. 16, 1992
Filed:
Mar. 21, 1989
Applicant:
Inventors:
Takashi Hase, Kobe, JP;
Hiromi Matsumura, Kobe, JP;
Yoshihiko Onishi, Kobe, JP;
Hidetaka Hayashi, Kobe, JP;
Motoharu Sato, Mohka, JP;
Assignee:
Kabushiki Kaisha Kobe Seiko Sho, Kobe, JP;
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G11B / ;
U.S. Cl.
CPC ...
428694 ; 428900 ; 428 64 ;
Abstract
Magnetic recording media, wherein a substrate of Al-Mg alloy prepared from aluminum metal at a purity of higher than 99.99% is surface finished by electrolytic abrasive polishing and a thin film layer of ferromagnetic material is formed thereover as a recording layer. The Al-Mg alloy is preferably prepared by rapid-cooling solidification.