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. 24, 1997
Applicant:
Inventors:
Kunio Takeuchi, Hachioji, JP;
Teruki Kitayama, Ome, JP;
Assignee:
Hoya Corporation, Tokyo, JP;
Primary Examiner:
Int. Cl.
CPC ...
G11B 5/66 ;
U.S. Cl.
CPC ...
G11B 5/66 ;
Abstract
A glass substrate contains at least ZrO,and Li,O. In this event, ZrO,has a content which falls within the range between 0.6 and 1.9 mol % while Li,O has a content which falls within the range between 6 and 14 mol %. Thus, the contents of ZrO,and Li,O are restricted to a predetermined range. Consequently, the projections of the undissolved substance of ZrO,are not formed on the surface of the glass substrate. As a result, the glass substrate having the flat surface can be obtained.
Takeuchi, Kunio. (2001). Glass substrate for information recording medium and magnetic recording medium having the substrate (U.S. Patent No. 6187441). U.S. Patent and Trademark Office. https://idiyas.com/patent/badge/6187441
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile