US PATENT SUBCLASS 208 / 429
.~.~ Distinct addition zones


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

400  DF  BY TREATMENT OF SOLID MINERAL, E.G., COAL LIQUEFACTION, ETC. {13}
428  DF  .~ Including contact with extraneous additive other than hydrogen, e.g., solvent, etc. {7}
429.~.~ Distinct addition zones


DEFINITION

Classification: 208/429

Distinct addition zones:

(under subclass 428) Subject matter in which additive comes into contact with feedstock in a plurality of distinct contact zones.

(1) Note. The same additive may be employed in each contacting zone.

(2) Note. An extraction which occurs in a contacting zone may extract or dissolve desired hydrocarbon fractions or may be a mere washing or leaching of inorganic components, etc.