US PATENT SUBCLASS 501 / 54
.~.~.~ More than 90 percent by weight silica

Current as of: June, 1999
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501 /   HD   COMPOSITIONS: CERAMIC

1  DF  CERAMIC COMPOSITIONS {15}
11  DF  .~ Glass compositions, compositions containing glass other than those wherein glass is a bonding agent, or glass batch forming compositions {11}
53  DF  .~.~ Silica containing {3}
54.~.~.~ More than 90 percent by weight silica

DEFINITION

Classification: 501/54

More than 90 percent by weight silica:

(under subclass 53) Subject matter wherein the silica comprises over 90 percent by weight of the total composition.