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:
Aug. 09, 2016
Filed:
Apr. 27, 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 blank for magnetic disk and a method for manufacturing a glass substrate for magnetic disk are provided which are capable of producing a glass blank for magnetic disk having a good surface waviness by press forming. The method includes a forming process of press-forming a lump of molten glass using a pair of dies, wherein in the forming process, press forming is performed using thermally equalizing means for reducing a difference in temperature in the press forming surface of the die during pressing of the molten glass.