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. 06, 2001
Filed:
Sep. 17, 1998
Applicant:
Inventors:
Assignee:
Mitsubishi Chemical Corporation, Tokyo, JP;
Primary Examiner:
Int. Cl.
CPC ...
G11B 5/60 ;
U.S. Cl.
CPC ...
G11B 5/60 ;
Abstract
A magnetic recording medium substrate comprising glass, wherein the substrate uniformly recess minute grooves having a length and a width in the range of from 0.001 to 1 &mgr;m on the whole surface and an area percentage of grooves having a length or a width exceeding 1 &mgr;m is at most 0.5% of the glass substrate.