US PATENT SUBCLASS 252 / 502
.~ Elemental carbon containing

Current as of: June, 1999
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252 /   HD   COMPOSITIONS

500  DF  ELECTRICALLY CONDUCTIVE OR EMISSIVE COMPOSITIONS {6}
502.~ Elemental carbon containing {5}
503  DF  .~.~> With free metal
504  DF  .~.~> With carbide
505  DF  .~.~> With radioactive material
506  DF  .~.~> With metal compound {3}
510  DF  .~.~> With organic component {1}

DEFINITION

Classification: 252/502

(under subclass 500) Compositions which contain as an ingredient elemental carbon.

(1) Note. Where the composition or device is composed of carbon obtained from either plural sources or from natural fibers, the patent is classified in this and indented subclasses.

SEE OR SEARCH THIS CLASS, SUBCLASS:

510+, for compositions wherein an organic component is present in addition to the elemental carbon, even if the organic component is to be subsequently carbonized in whole or in part.

SEE OR SEARCH CLASS

201, Distillation: Processes, Thermolytic, appropriate subclasses for a process of carbonizing carbonaceous material.

423, Chemistry of Inorganic Compounds, 445+, for carbon, per se, including manufacturing processes involving a chemical reaction.

501, Compositions: Ceramic,

99+, for refractory composition containing elemental carbon.

516, Colloid Systems and Wetting Agents; Subcombinations Thereof; Processes of Making, Stabilizing, Breaking, or Inhibiting,

901, for a collection of art under the Class definition which discloses subject matter relating to a colloid system comprising substantially pure elemental Carbon in one of its various forms such as graphite, lamp black, carbon black, fullerenes.