Glass manufacturing – Processes – Forming product or preform from molten glass
Reexamination Certificate
2008-07-08
2008-07-08
Griffin, Steven P. (Department: 1791)
Glass manufacturing
Processes
Forming product or preform from molten glass
C065S061000, C065S065000, C065S112000
Reexamination Certificate
active
11079596
ABSTRACT:
Molten glass is press-molded by a metallic die in which a cylindrical body is provided in a vertically standing manner at a central part of a bottom surface of a bottomed hole and a molding surface corresponding to a chamfering shape of an outer peripheral edge surface of a glass substrate is consecutively formed in an inner peripheral wall, and a glass substrate precursor provided with the chamfering shape axially consecutive on an outer peripheral surface thereof and a through hole formed at a central part thereof is thereby formed. The glass substrate precursor is cut perpendicular to an axial direction to be separated into respective glass substrates. Next, the respective glass substrates are subjected to a lapping process and a polishing process, if necessary, to produce a glass substrate as a final product. According to the manufacturing method, a glass substrate for information recording medium whose inner and outer peripheral edge surfaces are chamfered can be manufactured with an improved efficiency. Further, a glass substrate having a small diameter can be manufactured with a high efficiency.
REFERENCES:
patent: 5186976 (1993-02-01), Kubo et al.
patent: 5779753 (1998-07-01), Vetter et al.
patent: 5785729 (1998-07-01), Yokokawa et al.
patent: 6096405 (2000-08-01), Takahashi et al.
patent: 6615613 (2003-09-01), Iwabuchi et al.
patent: 6845635 (2005-01-01), Watanabe et al.
patent: 7065984 (2006-06-01), Kezuka et al.
patent: 7140203 (2006-11-01), Saito et al.
patent: 2003/0134734 (2003-07-01), Nishimoto et al.
patent: 2003/0205060 (2003-11-01), Iwabuchi et al.
patent: 2000-109330 (2000-04-01), None
patent: 2003-137577 (2003-05-01), None
JP 2003137577 (Ogino Kazuo) May 14, 2003. [online] Retrieved May 31, 2008 from JPO PAJ Database:<url:http://www.19.ipdl.inpit.go.jp/PA1/cgi-bin/PA1NUMBER>.
JP 2000109330 (Kaneda Yasushi) Apr. 18, 2000. [online] Retrieved May 31, 2008 from JPO PAJ Database:<url:http://www.19.ipdl.inpit.go.jp/PA1/cgi-bin/PA1NUMBER>.
Japanese “Notification of Reasons for Refusal”, dated Feb. 5, 2008, for counterpart Japanese Patent Application No. 2004-080069, along with an English-translation thereof.
Mori Toshiharu
Sakai Shinji
Yamaguchi Yousuke
Konica Minolta Opto Inc.
Wilson DeMaris R.
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