Glass manufacturing – Processes – Fining or homogenizing molten glass
Reexamination Certificate
2007-06-19
2007-06-19
Hug, Eric (Department: 1731)
Glass manufacturing
Processes
Fining or homogenizing molten glass
C065S134900, C065S135100, C065S157000, C065S346000, C065S374120
Reexamination Certificate
active
10415772
ABSTRACT:
The apparatus for reduced-pressure refining of a glass melt includes a refining bank formed so that a reduced pressure is generated by a glass flow in it. The refining bank has a component, which is made from a refractory metal or refractory alloy acting as glass-contact material. The refractory metal or alloy contains molybdenum, tungsten, tantalum, and/or hafnium. The device of the present invention includes a protective gas reservoir for a protective gas and an automatically operating valve connecting the reservoir with the refining bank so that an inner side of the component that would otherwise be exposed when a pressure rise or a falling glass melt column occurs is protected from oxidation by the protective gas. A process for using the device during refining of the glass melt is also part of the invention.
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Duch Klaus-Dieter
Eichholz Rainer
Gohlke Dirk
Jakway Allen
Karetta Frank
Hug Eric
Schott AG
Striker Michael J.
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