US PATENT SUBCLASS 585 / 817
.~.~.~ Before crystal formation

Current as of: June, 1999
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585 /   HD   CHEMISTRY OF HYDROCARBON COMPOUNDS

800  DF  PURIFICATION, SEPARATION, OR RECOVERY {7}
812  DF  .~ By cooling of liquid to obtain solid, e.g., crystallization, etc. {4}
816  DF  .~.~ With addition of extraneous material {1}
817.~.~.~ Before crystal formation

DEFINITION

Classification: 585/817

Before crystal formation:

(under subclass 816) Subject matter in which the material is added before the chilling step is completed.

(1) Note. The added material often is one which forms a complex with a component of the mixture.