US PATENT SUBCLASS 568 / 753
.~.~.~.~.~.~ Of polyhydroxy phenol

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}
753.~.~.~.~.~.~ Of polyhydroxy phenol

DEFINITION

Classification: 568/753

Of polyhydroxy phenol:

(under subclass 749) Processes wherein the compound separated contains plural -OH groups.

(1) Note. This subclass provides for processes directed to separating such compounds as resorcinol, pyrogallol, hydroquinone, catechol, etc.