US PATENT SUBCLASS 562 / 480
.~.~.~ Polycarboxylic acids or salts thereof

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.~.~.~ Polycarboxylic acids or salts thereof {7}
481  DF  .~.~.~.~> Prepared by disproportionation
482  DF  .~.~.~.~> Preparation by isomerization
483  DF  .~.~.~.~> Preparation by hydrolysis of amide, anhydride, or ester
484  DF  .~.~.~.~> Preparation by hydrolysis of nitrile
485  DF  .~.~.~.~> Purification or recovery per se {2}
488  DF  .~.~.~.~> Plural rings
489  DF  .~.~.~.~> Carboxyl not directly attached to a ring

DEFINITION

Classification: 562/480

Polycarboxylic acids or salts thereof:

(under subclass 405) Compounds wherein the acid contains more than one carboxyl group.

(1) Note. This subclass contains, for example: [figure] [figure]