US PATENT SUBCLASS 203 / 68
.~.~ Hydrocarbon


Current as of: June, 1999
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203 /   HD   DISTILLATION: PROCESSES, SEPARATORY

50  DF  ADDING MATERIAL TO DISTILLAND EXCEPT WATER OR STEAM PER SE {2}
57  DF  .~ Organic compound {8}
68.~.~ Hydrocarbon {2}
69  DF  .~.~.~> Aromatic
70  DF  .~.~.~> Acyclic


DEFINITION

Classification: 203/68

(under subclass 57) Processes in which the compound is a hydrocarbon.

(1) Note. For purposes of this and indented subclasses the term "hydrocarbon" is limited to compounds consisting of carbon and hydrogen.

SEE OR SEARCH THIS CLASS, SUBCLASS:

12+, for a process of separating only water in which a hydrocarbon is the azeotroping agent.

43+, for a process in which the extracting liquid is a hydrocarbon.

52, for a process of adding a mixture of hydrocarbons to assist separation during distillation. SEE OR SEARCH CLASS

208, Mineral Oils: Processes and Products,

337, for a process of fraction- ating mineral oil using a hydrocarbon as a solvent.

585, Chemistry of Hydrocarbon Compounds, appropriate subclasses for compounds which consist of carbon and hydrogen only.