US PATENT SUBCLASS 562 / 590
.~.~.~ Polycarboxylic

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}
512  DF  .~.~ Acyclic {14}
590.~.~.~ Polycarboxylic {7}
591  DF  .~.~.~.~> Preparation by isomerization
592  DF  .~.~.~.~> Preparation by hydrogenation
593  DF  .~.~.~.~> Purification or recovery per se
594  DF  .~.~.~.~> Element other than C,H,O,N, or halogen
595  DF  .~.~.~.~> Unsaturated
596  DF  .~.~.~.~> Halogen
597  DF  .~.~.~.~> Oxalic acid per se or salt thereof

DEFINITION

Classification: 562/590

Polycarboxylic:

(under subclass 512) Compounds wherein the acid contains more than one carboxyl group.

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

SEE OR SEARCH CLASS

554, Organic Compounds,

1+, particularly subclass 166 for polycarboxylic acids derived by introducing additional carboxyl groups into higher fatty acids without cleavage.