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. 04, 2014
Filed:
Jan. 24, 2008
Ryuuichi Kashima, Shinjuku-ku, JP;
Hideki Isono, Shinjuku-ku, JP;
Shinji Eda, Shinjuku-ku, JP;
Tomotaka Yokoyama, Shinjuku-ku, JP;
Tadashi Tomonaga, Shinjuku-ku, JP;
Kraisorn Phandon, Amphur Muang, TH;
Weeraphan Yayod, Amphur Muang, TH;
Ryuuichi Kashima, Shinjuku-ku, JP;
Hideki Isono, Shinjuku-ku, JP;
Shinji Eda, Shinjuku-ku, JP;
Tomotaka Yokoyama, Shinjuku-ku, JP;
Tadashi Tomonaga, Shinjuku-ku, JP;
Kraisorn Phandon, Amphur Muang, TH;
Weeraphan Yayod, Amphur Muang, TH;
Hoya Corporation, Tokyo, JP;
Hoya Glass Disk (thailand) Ltd., Lamphun, TH;
Abstract
To provide a magnetic-disk glass substrate manufacturing method that can reduce the inner diameter dimensional error. A magnetic-disk glass substrate manufacturing method of this invention including a chemical strengthening step of bringing a plurality of glass substratesinto contact with chemical strengthening treatment solutions of a plurality of chemical strengthening treatment baths, respectively, to chemically strengthen the glass substrates further includes an inner diameter measuring step of measuring the inner diameter of each of the glass substratesbefore the chemical strengthening step, a grasping step of grasping a variation of the inner diameter of the glass substrateto be generated by the chemical strengthening step for each of the chemical strengthening treatment baths, and a combination determining step of determining the chemical strengthening treatment baths, that perform chemical strengthening, based on the variations so that the inner diameters of the glass substrates, whose inner diameters are measured, after the chemical strengthening step become a desired value. In the chemical strengthening step, the glass substratesare chemically strengthened in the determined chemical strengthening treatment baths, respectively.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile