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:
Dec. 30, 2003
Filed:
Aug. 09, 2001
Applicant:
Inventors:
Hiroshi Tomiyasu, Tokyo, JP;
Junichi Horikawa, Tokyo, JP;
Teiichiro Umezawa, Tokyo, JP;
Kenji Ayama, Tokyo, JP;
Tomotaka Yokoyama, Tokyo, JP;
Assignee:
Hoya Corporation, , JP;
Primary Examiner:
Int. Cl.
CPC ...
G11B 5/66 ; G11B 5/70 ; H01J 1/00 ;
U.S. Cl.
CPC ...
G11B 5/66 ; G11B 5/70 ; H01J 1/00 ;
Abstract
A magnetic recording medium that is high coersive force, hard to receive influence of thermal fluctuation, and brings about a considerable improvement of S/N ratio, and in which at least an underlayer and a magnetic layer are sequentially laminated on a substrate, wherein a pre-coat layer is interposed between said underlayer and said substrate and said pre-coat layer is constructed by sequentially laminating a lower layer containing Ni and P and an upper layer made of a Cr alloy.