US PATENT SUBCLASS 501 / 65
.~.~.~.~ And boron

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.~.~.~.~ And boron {1}
66  DF  .~.~.~.~.~> And aluminum {1}

DEFINITION

Classification: 501/65

And boron:

(under subclass 55) Compositions additionally containing boron or a boron compound.