US PATENT SUBCLASS 501 / 139
.~.~.~.~.~ And trivalent metal oxide

Current as of: June, 1999
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501 /   HD   COMPOSITIONS: CERAMIC

1  DF  CERAMIC COMPOSITIONS {15}
134  DF  .~ Titanate, zirconate, stannate, niobate, or tantalate or oxide of titanium, zirconium, tin, niobium, or tantalum containing (e.g., dielectrics, etc.) {1}
135  DF  .~.~ Alkaline earth or magnesium containing {1}
136  DF  .~.~.~ Titanate containing {1}
137  DF  .~.~.~.~ Barium titanate {2}
139.~.~.~.~.~ And trivalent metal oxide

DEFINITION

Classification: 501/139

And trivalent metal oxide:

(under subclass 137) Subject matter additionally containing an oxide of a trivalent metal.