US PATENT SUBCLASS 585 / 840
.~.~.~.~ Later agent is hydrocarbon

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

800  DF  PURIFICATION, SEPARATION, OR RECOVERY {7}
833  DF  .~ By addition of extraneous agent, e.g., solvent, etc. {15}
836  DF  .~.~ Different, sequentially used agents {3}
839  DF  .~.~.~ Later agent disengages earlier, e.g., decomplexing agent, etc. {1}
840.~.~.~.~ Later agent is hydrocarbon

DEFINITION

Classification: 585/840

Later agent is hydrocarbon:

(under subclass 839) Subject matter in which a later agent which disengages an earlier agent is a hydrocarbon.

(1) Note. Patents appearing in this subclass are not cross-referenced to subclass 867.