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:
Nov. 02, 1999
Filed:
Oct. 23, 1996
Applicant:
Inventors:
Yoji Arita, Kanagawa, JP;
Mitsunori Mochida, Kanagawa, JP;
Assignee:
Mitsubishi Chemical Corporation, Tokyo, JP;
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G11B / ; B23K / ;
U.S. Cl.
CPC ...
4286 / ; 428 653 ; 428141 ; 4286 / ; 4286 / ; 2191216 ; 21912165 ; 21912166 ; 21912176 ; 21912178 ;
Abstract
The present invention relates to a magnetic recording medium comprising at least a magnetic layer, optionally by means of an under layer and an intermediate layer thereon, on a non-magnetic substrate and, occasionally a protective layer disposed on the magnetic layer, wherein projections each of a shape having a plurality of protrusions per one projection are formed by the number of from 10 to 10.sup.6 per 1 mm.sup.2 by irradiation of energy beam to a surface of at least one of the substrate, the under layer, the intermediate layer, the magnetic layer and the protective layer.