US PATENT SUBCLASS 501 / 52
.~.~.~.~ And aluminum or beryllium

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}
41  DF  .~.~ Nonsilicate oxide glasses {4}
49  DF  .~.~.~ Boron containing {2}
52.~.~.~.~ And aluminum or beryllium

DEFINITION

Classification: 501/52

And aluminum or beryllium:

(under subclass 49) Compositions additionally containing aluminum or beryllium, or a compound of either of these elements.