US PATENT SUBCLASS 264 / 676
.~.~ Containing nitrogen gas, noble gas, or inert gas, per se

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}
674  DF  .~ Involving specified composition of heating atmosphere, other than air {2}
676.~.~ Containing nitrogen gas, noble gas, or inert gas, per se

DEFINITION

Classification: 264/676

Containing nitrogen gas, noble gas, or inert gas per se:

(under subclass 674) Process wherein a gaseous composition contains either nitrogen, a noble gas, or a gaseous environment identified solely as being inert; excluding nitrogen gas, noble gas, or inert gas which would naturally be present in air.