US PATENT SUBCLASS 501 / 51
.~.~.~.~.~ And zirconium, titanium, tantalum, or niobium


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}
50  DF  .~.~.~.~ And yttrium or rare earth (i.e., elements with atomic numbers 39, 57-71, or 89+) {1}
51.~.~.~.~.~ And zirconium, titanium, tantalum, or niobium


DEFINITION

Classification: 501/51

And zirconium, titanium, tantalum, or niobium:

(under subclass 50) Compositions additionally containing zirconium, titanium, tantalum, or niobium, or a compound of any of these elements.