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 /   HD   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.