US PATENT SUBCLASS 562 / 485
.~.~.~.~ Purification or recovery per se

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

*  DD  ORGANIC COMPOUNDS (Class 532, Subclass 1) {41}
400  DF  .~ Carboxylic acids and salts thereof {14}
405  DF  .~.~ Aromatic {13}
480  DF  .~.~.~ Polycarboxylic acids or salts thereof {7}
485.~.~.~.~ Purification or recovery per se {2}
486  DF  .~.~.~.~.~> By crystallization
487  DF  .~.~.~.~.~> By reaction of undesired component

DEFINITION

Classification: 562/485

Purification or recovery, per se:

(under subclass 480) Processes which are directed to the purification, separation, or recovery of aromatic polycarboxylic acids.

(1) Note. See subclasses 408+, and particularly subclass 414 for patents which claim the combination of formation of a carboxyl group by oxidation followed by a significant purification or recovery step.

(2) Note. See (1) Note (b) under subclass 400 for the placement of patents claiming the purification or recovery of an acid combined with a salt forming or salt hydrolysis step.