US PATENT SUBCLASS 208 / 391
.~ Inorganic (only) liquid

Current as of: June, 1999
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208 /   HD   MINERAL OILS: PROCESSES AND PRODUCTS

390  DF  TAR SAND TREATMENT WITH LIQUID {1}
391.~ Inorganic (only) liquid

DEFINITION

Classification: 208/391

Inorgnic (only) liquid:

(under subclass 390) Subject matter in which the liquid is inorganic, usually water.

(1) Note. Treatment with a solvent mixture containing any organic diluent or adjuvant in admixture with water is classified in subclass 390.

(2) Note. A multistep extraction procedure is classified in this subclass only when each extraction step uses an inorganic liquid only.