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. 06, 2015
Filed:
May. 23, 2012
Hideki Isono, Kofu, JP;
Hidekazu Tanino, Akishima, JP;
Akira Murakami, Akiruno, JP;
Takashi Sato, Inagi, JP;
Masamune Sato, Kodaira, JP;
Hideki Isono, Kofu, JP;
Hidekazu Tanino, Akishima, JP;
Akira Murakami, Akiruno, JP;
Takashi Sato, Inagi, JP;
Masamune Sato, Kodaira, JP;
HOYA CORPORATION, Tokyo, JP;
Abstract
A method for manufacturing a glass substrate for magnetic disk, the internal strain of which is reduced without performing annealing treatment, is provided. The method includes a forming process of forming a plate-shaped glass blank by pressing a lump of molten glass using a pair of dies, wherein the method includes: a removing process of removing at least a part of a residual stress layer formed on the principal face of the glass blank press-formed in the forming process; and a process of forming a donut-shaped glass substrate by subjecting the glass blank after the removing process to machining.