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:
Sep. 30, 2014
Filed:
Mar. 30, 2012
Applicants:
Hideki Isono, Kofu, JP;
Hidekazu Tanino, Tokyo, JP;
Inventors:
Hideki Isono, Kofu, JP;
Hidekazu Tanino, Tokyo, JP;
Assignee:
Hoya Corporation, Tokyo, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
C03B 11/00 (2006.01); C03B 11/08 (2006.01); B32B 15/00 (2006.01);
U.S. Cl.
CPC ...
C03B 11/084 (2013.01); C03B 11/088 (2013.01); C03B 2215/03 (2013.01); C03B 2215/11 (2013.01); C03B 11/086 (2013.01); C03B 2215/50 (2013.01); C03B 2215/16 (2013.01); C03B 2215/44 (2013.01); C03B 2215/70 (2013.01);
Abstract
A manufacturing method of a sheet glass material for magnetic disk, the method includes, dropping process for dropping a lump of molten glass; pressing process for sandwiching simultaneously the lump from both sides of the dropping path of the lump with surfaces of a pair of dies facing together, and performing press forming to the lump to obtain a sheet glass material, wherein at least one of the pair of dies has a concave shape with respect to the dropping path of the lump.