US PATENT SUBCLASS 501 / 68
.~.~.~.~ And aluminum or iron compound


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}
55  DF  .~.~.~ 40 percent - 90 percent by weight silica {7}
68.~.~.~.~ And aluminum or iron compound {1}
69  DF  .~.~.~.~.~> And divalent metal oxide (e.g., oxides of zinc, cadmium, beryllium, alkaline earth metal, magnesium, etc.) {1}


DEFINITION

Classification: 501/68

And aluminum or iron compound:

(under subclass 55) Compositions additionally containing compounds of aluminum or of iron.