Glass manufacturing – Processes – Fining or homogenizing molten glass
Reexamination Certificate
2002-06-07
2009-02-17
Griffin, Steven P. (Department: 1791)
Glass manufacturing
Processes
Fining or homogenizing molten glass
C065S134100, C501S066000, C501S067000
Reexamination Certificate
active
07490486
ABSTRACT:
The process of producing a refined borosilicate glass includes preparing a glass batch with a composition in wt. % on the basis of oxide content of SiO2,65-82; Al2O3, 2-8; B2O3, 5-13; MgO+CaO+SrO +BaO+ZnO, 0-7; ZrO2, 0-2; and Li2O+Na2O+K2O, 3-10; adding 0.05 wt. % to 0.6 wt. % of sulfate(s) expressed as SO3to the glass batch as the refining agent; melting the glass batch including the refining agent to form melted glass; and then hot-shaping the borosilicate glass. The refining agent may also include from 0.01 wt. % to 0.6 wt. % of F−or from 0.015 wt. % to 0.6 wt. of Cl−. The sulfate is preferably an alkali metal and/or alkaline earth metal sulfate or sulfates.
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Kass Christof
Naumann Karin
Ott Franz
Griffin Steven P.
Lazorcik Jason L.
Schott AG
Striker Michael J.
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