US PATENT SUBCLASS 585 / 852
.~.~.~ Al

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}
851  DF  .~.~ Group III nontransition element-containing {1}
852.~.~.~ Al

DEFINITION

Classification: 585/852

Al:

(under subclass 851) Subject matter in which the agent contains aluminum in free or combined form.

(1) Note. Often the agent is a catalyst containing alumina or aluminum halide.