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:
Oct. 29, 2002
Filed:
Jun. 27, 2000
Fumiyoshi Kirino, Tokyo, JP;
Nobuyuki Inaba, Hasuda, JP;
Hiroki Yamamoto, Hitachi, JP;
Ken Takahashi, Tokai, JP;
Takashi Naitou, Hitachiota, JP;
Motoyasu Terao, Hinode, JP;
Sumio Hosaka, Hinode, JP;
Eiji Koyama, Tsuchiura, JP;
Hiroki Kuramoto, Yokohama, JP;
Other;
Abstract
The magnetic recording medium includes an underlayer formed of an inorganic compound layer, and a magnetic layer formed over the underlayer . The inorganic compound layer as the underlayer has crystal grains and at least one kind of oxide, the crystal grains having as main elements at least one of cobalt oxide, chromium oxide, iron oxide and nickel oxide, the at least one kind of oxide lying as a non-crystalline phase in grain boundaries between the crystal grains and selected from among silicon oxide, aluminum oxide, titanium oxide, tantalum oxide and zinc oxide.