US PATENT SUBCLASS 501 / 4
.~.~ Silica containing crystalline phase (e.g., stuffed quartz, crystobalite, etc.)
Current as of:
June, 1999
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501 /
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COMPOSITIONS: CERAMIC
1
DF
CERAMIC COMPOSITIONS
{15}
2
DF
.~ Devitrified glass-ceramics {4}
4
.~.~ Silica containing crystalline phase (e.g., stuffed quartz, crystobalite, etc.)
DEFINITION
Classification: 501/4
Silica containing crystalline phase (e.g., stuffed quartz, cristobalite, etc.):
(under subclass 2) Subject matter wherein the crystalline phase comprises silica.
(1) Note. The crystalline phase may comprise, e.g., the so-called stuffed quartz, cristobalite (a crystalline form of SiO2), etc.
