US PATENT SUBCLASS 501 / 143
.~.~ And flint or feldspar

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

1  DF  CERAMIC COMPOSITIONS {15}
141  DF  .~ Clay containing (e.g., porcelain, earthenware, etc.) {3}
143.~.~ And flint or feldspar {1}
144  DF  .~.~.~> Kaolin (e.g., ball clay, fire clay, etc.) containing

DEFINITION

Classification: 501/143

And flint or feldspar:

(under subclass 141) Compositions additionally containing flint or feldspar.