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:
Aug. 26, 2008
Filed:
Mar. 27, 2003
Applicants:
Yuriko Kudoh, Osaka, JP;
Kazuishi Mitani, Osaka, JP;
Yasuhiro Saito, Osaka, JP;
Inventors:
Assignee:
Hoya Corporation, Tokyo, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
C03C 21/00 (2006.01);
U.S. Cl.
CPC ...
Abstract
Prior to conducting chemical strengthening treatment by contacting a glass with a potassium-containing chemical strengthening treating solution, oxidation treatment is conducted to iron-containing particles adhered to a surface of the glass as a pre-step, and the glass is then chemically strengthened. The oxidation treatment is a heat treatment conducted at 80-400° C. in the air. A glass substrate for an information recording medium is obtained by the method.