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. 18, 2011
Filed:
Oct. 22, 2003
Applicants:
Yasuhiro Saito, Osaka, JP;
Toshiaki Hashimoto, Osaka, JP;
Yuriko Kudoh, Osaka, JP;
Inventors:
Assignee:
Hoya Corporation, Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
B24B 1/00 (2006.01); B24B 7/19 (2006.01); B24B 7/30 (2006.01); G11B 7/24 (2006.01);
U.S. Cl.
CPC ...
Abstract
A method for manufacturing a glass substrate for an information recording medium having a high level of cleanness and superior smoothness. The manufacturing method includes washing a disk-shaped glass plate with an acid washing liquid, removing at least part of a surface layer, which is formed on the surface of the glass plate, by performing grinding with diamond abrasion grains, and washing the surface with a neutral or alkaline washing liquid.