US PATENT SUBCLASS 75 / 243
.~.~.~ Nonmetal is elemental Carbon(C) only

Current as of: June, 1999
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75 /   HD   SPECIALIZED METALLURGICAL PROCESSES, COMPOSITIONS FOR USE THEREIN, CONSOLIDATED METAL POWDER COMPOSITIONS, AND LOOSE METAL PARTICULATE MIXTURES

300  DF  COMPOSITIONS {5}
228  DF  .~ Consolidated metal powder compositions {4}
230  DF  .~.~ With nonmetal constituent - Silicon(Si) considered a metal (e.g., cermet, etc.) {5}
243.~.~.~ Nonmetal is elemental Carbon(C) only

DEFINITION

Classification: 75/243

Nonmetal is elemental Carbon (C) only:

(under subclass 230) Composition in which the only permissible nonmetal component is carbon, and wherein the carbon is not claimed as being part of a chemical compound.

(1) Note. The claiming of a component of the composition as "steel," "cast iron" or other metal product known to contain carbon as an essential component, e.g., a "carburized" metal or alloy, is sufficient for placement in this subclass (243).

SEE OR SEARCH THIS CLASS, SUBCLASS:

230, for a composition containing elemental carbon plus a nonmetal other than oxide, carbide, boron or nitrogen.

231, for a composition wherein elemental carbon (e.g., graphite, diamond) is not claimed as such, but only designated as a lubricant, abrasive, etc.

233, for a composition containing elemental carbon in addition to an oxide.

237, for a composition containing elemental carbon in addition to a carbide. 244, for a composition containing elemental carbon in addition to nitrogen or boron.

SEE OR SEARCH CLASS

501, Compositions: Ceramic,

99+, for refractory ceramic compositions containing elemental carbon.