Glass manufacturing – Processes – With chemically reactive treatment of glass preform
Reexamination Certificate
2007-10-05
2010-11-30
Lopez, Carlos (Department: 1791)
Glass manufacturing
Processes
With chemically reactive treatment of glass preform
C065S030130, C065S030140
Reexamination Certificate
active
07841210
ABSTRACT:
In a method of manufacturing a glass substrate for an information recording medium including a step for chemically strengthening the glass substrate by contacting the glass substrate with chemical strengthening processing liquid containing chemical strengthening salt, concentration of Fe and Cr is 500 ppb or less in said chemical strengthening salt, respectively. The concentration may be detected by the use of an ICP (Inductively Coupled Plasma) emission spectrometry analyzing method or a fluorescent X-ray spectroscopy analyzing method.
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Ikeda Hiroaki
Mukai Yumi
Ozawa Jun
Sasaki Kazuna
Suzuki Masaru
Hoya Corporation
Lopez Carlos
Sughrue & Mion, PLLC
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