US PATENT SUBCLASS 501 / 67
.~.~.~.~.~.~ And zinc or zirconium

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}
65  DF  .~.~.~.~ And boron {1}
66  DF  .~.~.~.~.~ And aluminum {1}
67.~.~.~.~.~.~ And zinc or zirconium

DEFINITION

Classification: 501/67

And zinc or zirconium:

(under subclass 66) Compositions additionally containing zinc or zirconium or a compound of either of these elements.