US PATENT SUBCLASS 501 / 97.1
.~.~.~ Silicon nitride containing (Si3N4)

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

1  DF  CERAMIC COMPOSITIONS {15}
94  DF  .~ Refractory {8}
96.1  DF  .~.~ Boride, silicide, nitride, oxynitride, carbonitride, or oxycarbonitride containing {7}
97.1.~.~.~ Silicon nitride containing (Si3N4) {2}
97.2  DF  .~.~.~.~> With trivalent metal compound (e.g., yttrium, rare earth, or aluminum compound, etc.) {1}
97.4  DF  .~.~.~.~> Composites (continuous matrix with dispersed phase)

DEFINITION

Classification: 501/97.1

Silicon nitride containing (Si3N4):

(under subclass 96.1) Compositions in which a component is silicon nitride (Si3N4[end subscrpt]).