Glass-ceramics process for their preparation and use
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United States of America Patent
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Aug 12, 2003
Grant Date -
N/A
app pub date -
Feb 7, 2000
filing date -
Aug 11, 1997
priority date (Note) -
Expired
status (Latency Note)
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Abstract
The present invention refers to glass-ceramics consisting of the mixtures (I): ZrO.sub.2 --SiO.sub.2 --Me.sup.II O, or (II) SiO.sub.2 --Me.sup.III O.sub.2 --Me.sup.II O, wherein: Me.sup.II is chosen in the group consisting of: Ca, Ba, Mg, Zn or mixture thereof; Me.sup.III is chosen in the group consisting of Al, B or mixtures thereof; each of the above said constituents being present in determined quantities; the invention refers also to a process for preparing the glass-ceramics above defined; porcelain stonewares and glazes containing them and their use for preparing ceramic items.
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