US PATENT SUBCLASS 203 / 51
.~ At least two materials

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}
51.~ At least two materials {3}
52  DF  .~.~> Mixtures of hydrocarbons
53  DF  .~.~> One material is water {2}
56  DF  .~.~> One additive an alcohol or ether

DEFINITION

Classification: 203/51

(under subclass 50) Processes in which plural materials are added.

(1) Note. Each of the added materials may be repeatedly added to the distilland at different points in the same distillation zone, for the purpose of this subclass.

(2) Note. When a series of distillations is carried out and a different substance is added in separate distillations, the process is treated as adding a single substance and classified under subclass 50 according to the claimed added substance first appearing.