US PATENT SUBCLASS 264 / 674
.~ Involving specified composition of heating atmosphere, other than air

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

DEFINITION

Classification: 264/674

Involving specified composition of heating atmosphere other than air:

(under subclass 603) Process wherein the constitution of gaseous environment utilized during a heating step is specified, excluding the inherent composition of natural air.

(1) Note. Merely, specifying that the heating step takes place in air or under atmospheric conditions will not be

sufficient for placement under this subclass.

SEE OR SEARCH THIS CLASS, SUBCLASS:

646, Utilizing chemically reactive atmosphere other than air during sintering to convert precursor to ceramic material.