US PATENT SUBCLASS 208 / 192
.~.~.~ With preliminary treatment of oil

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

177  DF  REFINING {23}
189  DF  .~ Sweetening {6}
191  DF  .~.~ With copper compounds {3}
192.~.~.~ With preliminary treatment of oil

DEFINITION

Classification: 208/192

(under subclass 191) Processes combined with a nonconversion treatment of the mineral oil prior to the sweetening treatment with a copper compound.

(1) Note. The preliminary treatment may, for example, include a removal of some other contaminant prior to the sweetening treatment.