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. 05, 1993
Filed:
Sep. 08, 1992
Applicant:
Inventors:
Noriaki Tani, Chiba, JP;
Kyuzo Nakamura, Chiba, JP;
Michio Ishikawa, Chiba, JP;
Masanori Hashimoto, Chiba, JP;
Yoshifumi Ota, Chiba, JP;
Assignee:
Nihon Shinku Gijutsu Kabushiki Kaisha, Chigasaki, JP;
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G11B / ; B32B / ;
U.S. Cl.
CPC ...
428 64 ; 428 65 ; 428336 ; 428694 ; 428900 ; 428663 ; 427130 ; 427131 ;
Abstract
A magnetic recording medium suitable for high-density recording which comprises a non-magnetic substrate disk, at least one magnetic layer and at least one protective layer, the magnetic layer and the protective layer being formed in succession on the non-magnetic substrate disk, wherein the non-magnetic substrate disk comprises a glass substrate and at least one non-magnetic metallic film provided on the glass substrate, and the non-magnetic metallic film is provided on a surface thereof with a multitude of fine concentric grooves.