US PATENT SUBCLASS 501 / 31
.~.~.~ Uncombined silica containing (e.g., sand)

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}
27  DF  .~.~ Glass batch forming compositions (i.e., glass batch compositions) {4}
31.~.~.~ Uncombined silica containing (e.g., sand)

DEFINITION

Classification: 501/31

Uncombined silica containing (e.g., sand):

(under subclass 27) Compositions which contain uncombined silica as an ingredient of the batch.

(1) Note. The uncombined silica is typically disclosed to be sand.