US PATENT SUBCLASS 568 / 761
.~.~.~.~.~.~ From oil or tar derived from fossil fuel or wood

Current as of: June, 1999
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568 /   HD   ORGANIC COMPOUNDS -- PART OF THE CLASS 532-570 SERIES

*  DD  ORGANIC COMPOUNDS (Class 532, Subclass 1) {4}
300  DF  .~ OXYGEN CONTAINING (E.G., PERCHLORYLBENZENE, ETC.) {11}
700  DF  .~.~ Hydroxy containing (H of -OH may be replaced by a Group IA or IIA light metal) {10}
715  DF  .~.~.~ Benzene ring containing {8}
716  DF  .~.~.~.~ Phenols (H of -OH may be replaced by a Group IA or IIA light metal) {14}
749  DF  .~.~.~.~.~ Purification or recovery {10}
761.~.~.~.~.~.~ From oil or tar derived from fossil fuel or wood {1}
762  DF  .~.~.~.~.~.~.~> Alkali metal hydroxide utilized

DEFINITION

Classification: 568/761

From oil or tar derived from fossil fuel or wood:

(under subclass 749) Processes wherein the compound is separated from oil or tar derived from fossil fuel or wood.

(1) Note. Included herein are processes of separating phenols from petroleum and tars from coke ovens or from the destructive distillation of wood, lignite, or coal.