US PATENT SUBCLASS 208 / 303
.~.~ Plural treating stages

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

177  DF  REFINING {23}
299  DF  .~ With solid catalyst or absorbent {8}
303.~.~ Plural treating stages

DEFINITION

Classification: 208/303

(under subclass 299) Processes wherein mineral oil is subjected to a plurality of distinct refining treatments, solid catalyst or adsorbent being employed in each of the treatments.