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:
Apr. 11, 2000
Filed:
Mar. 19, 1998
Fine Glass Technology Co., Ltd., Tokyo, JP;
Abstract
To propose a method of cleaning a surface of a glass substrate fabricated by a process of strengthening a surface thereof by alkaline ion exchange reaction by selectively removing alkaline metal on the surface by cleaning the surface by using an activated ionic water produced by electric polarization and as a result, to provide a glass substrate for a magnetic disk having a magnetic medium with insignificant corrosion and excellent S/N ratio, in cleaning a glass substrate for a magnetic disk using a glass substrate pulled up from a chemically strengthening treatment solution produced by an alkaline ion exchange reaction, after a final polishing step of fabricating the glass substrate for a magnetic disk, the glass substrate is cleaned by an activated anodically electrolyzed water produced by electric polarization to thereby selectively remove the alkaline metal at the vicinity of the surface.