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:
Jan. 01, 2008
Filed:
Dec. 03, 2003
Kengo Kainuma, Nagano, JP;
Tatsumi Kawata, Nagano, JP;
Kunio Hibino, Osaka, JP;
Tomokazu Tokunaga, Hyogo, JP;
Kengo Kainuma, Nagano, JP;
Tatsumi Kawata, Nagano, JP;
Kunio Hibino, Osaka, JP;
Tomokazu Tokunaga, Hyogo, JP;
Fuji Electric Device Technology Co., Ltd, Tokyo, JP;
Matsushita Electric Industrial Co. Ltd, Osaka, JP;
Abstract
A method of manufacturing a glass substrate for a storage medium by pressing a glass material between an upper and a lower dies. The method includes a heating step of heating the glass material arranged between the upper and lower dies, a pressing step of pressing the heated glass material via the upper and lower dies, and a cooling step of having, after the pressing step, a cooling member contact the upper and lower dies to cool them together with the molded glass material arranged between the upper and lower dies. During the heating step and the pressing step, a vacuum atmosphere is maintained in a space containing the dies and the glass material. When the pressing step has completed, an inert gas is filled in the space to set a pressure in the space equal to an ambient pressure.