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. 22, 1999
Filed:
Sep. 21, 1995
Jota Ito, Miyagi, JP;
Takashi Chiba, Miyagi, JP;
Kenichi Sato, Miyagi, JP;
Hidetoshi Honda, Miyagi, JP;
Toshiharu Uchimi, Miyagi, JP;
Taketoshi Sato, Miyagi, JP;
Yukihiro Koshika, Miyagi, JP;
Yasumi Sato, Miyagi, JP;
Sony Corporation, Tokyo, JP;
Abstract
A magnetic recording medium having a thin magnetic metal film formed by vapor deposition under an atmosphere of an introduced oxygen gas. The thickness of the surface oxide film having the degree of oxidation of 50% or higher is maintained so as to be not higher than 5% of the total film thickness of the thin magnetic metal film. The magnetic recording medium is affected to a lesser extent by the surface oxide layer such that it is superior in magnetic properties, such as coercivity, and in electromagnetic properties.