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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.:

US 8966939 B1

PDFFull Text
Date of Patent:
Mar. 03, 2015

Filed:

Mar. 10, 2011

Method for producing glass substrate for information recording medium

Applicant:

Hazuki Nakae, Kyoto, JP;

Inventor:

Hazuki Nakae, Kyoto, JP;

Assignee:

Hoya Corporation, Tokyo, JP;

Attorney:

Brinks Gilson & Lione

Primary Examiner:

Kevin M Bernatz

Assistant Examiner:

Louis Falasco

Int. Cl.
CPC ...
B24B 7/00 (2006.01); C03C 3/04 (2006.01); B24B 37/04 (2012.01); G11B 5/84 (2006.01); C03C 3/095 (2006.01); C08C 19/00 (2006.01); G11B 5/73 (2006.01);
U.S. Cl.
CPC ...
G11B 5/8404 (2013.01); C03C 3/095 (2013.01); C08C 19/00 (2013.01); G11B 5/7315 (2013.01);
Abstract

Disclosed is a method of producing a glass substrate for an information recording medium including a rough polishing step of performing a rough polishing on a glass material containing 0.01 to 2 mass % of cerium oxide; a washing step of washing the glass material after the rough polishing step, so that the cerium content of the glass material surface becomes 0.125 ng/cmor less; and a precision polishing step of performing precision polishing on the glass material after the washing step by cyclically using a polishing material containing colloidal silica.

Find Patent Forward Citations

Nakae, Hazuki. (2015). Method for producing glass substrate for information recording medium (U.S. Patent No. 8966939). U.S. Patent and Trademark Office. https://idiyas.com/patent/badge/8966939

Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile

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