US PATENT SUBCLASS 208 / 326
.~.~.~.~ Hetero-N-containing

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

308  DF  FRACTIONATION {5}
311  DF  .~ Liquid extraction with solvents {11}
322  DF  .~.~ Organic solvent containing {8}
325  DF  .~.~.~ Heterocyclic {2}
326.~.~.~.~ Hetero-N-containing

DEFINITION

Classification: 208/326

(under subclass 325) Processes wherein the heterocyclic compound contains nitrogen in the ring.

(1) Note. This subclass contains, for example, extraction processes using pyridine or morpholine as the solvent.