US PATENT SUBCLASS 501 / 138
.~.~.~.~.~ And divalent metal oxide other than alkaline earth oxide or magnesium 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}
138.~.~.~.~.~ And divalent metal oxide other than alkaline earth oxide or magnesium oxide

DEFINITION

Classification: 501/138

And divalent metal oxide other than alkaline earth oxide or magnesium oxide:

(under subclass 137) Subject matter additionally containing an oxide of a divalent metal other than an alkaline earth metal or magnesium.

(1) Note. The Alkaline earth includes calcium, strontium and barium.