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:
Jul. 15, 2003
Filed:
Jul. 05, 2000
Applicant:
Inventors:
Hideki Nagata, Kobe, JP;
Hideki Kawai, Nishinomiya, JP;
Toshiharu Mori, Settsu, JP;
Hiroshi Yuki, Shiga-Ken, JP;
Kazuhiko Ishimaru, Kaizuka, JP;
Assignee:
Minolta Co., Ltd., Osaka, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C03C 1/004 ; C03C 1/014 ;
U.S. Cl.
CPC ...
C03C 1/004 ; C03C 1/014 ;
Abstract
A glass ceramics composition for recording disk substrate consists essentially, expressed in terms of weight percent on the oxide basis, of from 65 to 80 wt % of SiO , from 3 to 15 wt % of Al O , from 3 to 15 wt % of Li O, from 0.2 to 5 wt % of P O , and from 0.1 to 15 wt % of ZrO , wherein a value of ZrO /P O is within a range from 1.1 to 8.5, expressed in terms of weight percent on the oxide basis.