Crystalline silicas
Number of patents in Portfolio can not be more than 2000
United States of America Patent
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-
Nov 1, 1988
Grant Date -
N/A
app pub date -
Dec 19, 1983
filing date -
Dec 19, 1983
priority date (Note) -
Expired
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Abstract
A novel crystalline silica composition having a silica to alumina atomic ratio not lower than 80 and having a certain specific X-ray diffraction pattern after calcination in air for at least 3 hours at a temperature of at least 500.degree. C.
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