US PATENT SUBCLASS 501 / 97.3
.~.~.~.~.~ With alkaline earth metal compound

Current as of: June, 1999
Click HD for Main Headings
Click for All Classes

Internet Version by PATENTEC © 1999      Terms of Use


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  DF  .~.~.~ Silicon nitride containing (Si3N4) {2}
97.2  DF  .~.~.~.~ With trivalent metal compound (e.g., yttrium, rare earth, or aluminum compound, etc.) {1}
97.3.~.~.~.~.~ With alkaline earth metal compound

DEFINITION

Classification: 501/97.3

With alkaline earth metal compound:

(under subclass 97.2) Compositions additionally containing an alkaline earth metal compound.