Glass manufacturing – Processes – Forming product or preform from molten glass
Reexamination Certificate
2002-10-22
2010-06-22
Lopez, Carlos (Department: 1791)
Glass manufacturing
Processes
Forming product or preform from molten glass
C065S033100, C065S033100
Reexamination Certificate
active
07739885
ABSTRACT:
Provided are a method for producing a glass suitable for an information recording medium required to have high qualities, a process for the production of a glass substrate blank from the above glass and a process for the production of a glass substrate from the above blank. The method is for the production of a glass containing an alkali metal element by melting a glass material in a glass melting apparatus and uses, as said melting apparatus, a melting apparatus whose glass-contact portion is made of a material containing zirconium and containing substantially no alkali metal element. In the process for the production of a glass substrate blank, the glass obtained by the above method is press-molded or is subjected to a float process, and in the process for the production of a glass substrate, the above glass substrate blank is lapped and polished.
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Machine translation of JP 2000-302560 retrieved from http://www19.ipdl.ncipi.go.jp/PA1/cgi-bin/PA1INIT?1102431898753 on Jun. 19, 2006.
Ogino Kazuo
Suzuki Koji
Hoya Corporation
Lopez Carlos
Nixon & Vanderhye P.C.
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