US PATENT SUBCLASS 264 / 647
.~.~ Nitrogen

Current as of: June, 1999
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264 /   HD   PLASTIC AND NONMETALLIC ARTICLE SHAPING OR TREATING: PROCESSES

603  DF  OUTSIDE OF MOLD SINTERING OR VITRIFYING OF SHAPED INORGANIC ARTICLE OR PREFORM {30}
646  DF  .~ Utilizing chemically reactive atmosphere other than air, per se, during sintering to convert precursor to ceramic material {2}
647.~.~ Nitrogen

DEFINITION

Classification: 264/647

Nitrogen:

(under subclass 646) Process wherein the reactive gaseous agent is nitrogen.