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. 26, 1999
Filed:
Dec. 23, 1997
Applicant:
Inventor:
Kazuo Tachiwana, Tokyo, JP;
Assignee:
Hoya Corporation, Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G11B / ;
U.S. Cl.
CPC ...
428 642 ; 428145 ; 428410 ; 428426 ; 428432 ; 4286 / ; 4286 / ; 428900 ; 427128 ; 427129 ; 427130 ; 427131 ;
Abstract
A highly reliable information recording medium capable of meeting a higher rotation speed of a drive device and a smaller thickness and a higher recording density of an information recording medium can be produced by using, as a substrate, chemically reinforced glass obtained from chemically reinforceable glass having an SiO.sub.2 --Al.sub.2 O.sub.3 --R.sub.2 O total content of more than 98% by weight and having a specific modulus of at least 30.times.10.sup.2.