US PATENT SUBCLASS 585 / 800
PURIFICATION, SEPARATION, OR RECOVERY

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

800PURIFICATION, SEPARATION, OR RECOVERY {7}
801  DF  .~> By conversion of solid to gas, e.g., sublimation, etc., or by melting or squeezing out liquid from solid natural source
802  DF  .~> By plural serial diverse separations {3}
812  DF  .~> By cooling of liquid to obtain solid, e.g., crystallization, etc. {4}
818  DF  .~> By membrane, selective septum, or coalescer {1}
820  DF  .~> By contact with solid sorbent {7}
832  DF  .~> Polymerization and depolymerization
833  DF  .~> By addition of extraneous agent, e.g., solvent, etc. {15}

DEFINITION

Classification: 585/800

PURIFICATION, SEPARATION, OR RECOVERY:

(under the class definition) Processes in which a mixture of a hydrocarbon compound with another substance is treated to recover that same compound in a more usable condition, that is, a purer or less undesirable condition, by a treatment which comprises separating the hydrocarbon from the other substance or making the other substance less obnoxious.

(1) Note. The other substance may be other hydrocarbons of this class (585) whether desired or not, nonhydrocarbon materials, or hydrocarbon materials classified elsewhere, the recovery of which is not desired.

(2) Note. To be classified in these subclasses (800+) the recovered hydrocarbon must enter the process and leave the

process as the same compound, even though it may be converted to an intermediate and reverted to the original compound during the course of the process.

(3) Note. In general, the subject matter provided for herein includes chemical, physical and chemical, and physical processes directed to the purification or separation of those hydrocarbon compounds covered by the definition of this class, unless such treatment is provided for elsewhere as pointed out in the notes below.

(4) Note. See the Class Definition, Lines With Other Classes and Within This Class, "Lines between Subclasses 800+ and Other Areas for a discussion of the hierarchical relationship among (1) this subclass and its indents and (2) other areas.