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:
Feb. 13, 2001
Filed:
Dec. 04, 1998
Applicant:
Inventor:
Tadao Katsuragawa, Kanagawa, JP;
Assignee:
Ricoh Company, Ltd., Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G11B 5/66 ;
U.S. Cl.
CPC ...
G11B 5/66 ;
Abstract
A magnetic recording medium has a transparent substrate with a plurality of grooves which extend parallel with each other at regular intervals, each of the grooves having inner side walls perpendicular to the transparent substrate and a space between adjacent side walls being constant, a magnetic material layer extending in the form of a stripe, provided on the surface of the inner side walls of each of the grooves, and a pair of dielectric multi-layers which are disposed so as to sandwich the transparent substrate therebetween.