US PATENT SUBCLASS 501 / 131
.~.~.~.~.~.~ Less than 40 percent by weight clay

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

1  DF  CERAMIC COMPOSITIONS {15}
94  DF  .~ Refractory {8}
126  DF  .~.~ Trivalent metal compound (e.g., iron oxide, chromium oxide, trivalent rare earth oxide, etc.) containing {2}
127  DF  .~.~.~ Aluminum compound (e.g., clay, aluminium oxide, etc.) {1}
128  DF  .~.~.~.~ And silicon compound other than clay {2}
130  DF  .~.~.~.~.~ And clay containing {1}
131.~.~.~.~.~.~ Less than 40 percent by weight clay

DEFINITION

Classification: 501/131

Less than 40 percent by weight clay:

(under subclass 130) Subject matter wherein the clay is present in a concentration greater than zero percent and less than 40 percent by weight of the total composition.