US PATENT SUBCLASS 562 / 400
.~ Carboxylic acids and 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.~ Carboxylic acids and salts thereof {14}
401  DF  .~.~> Racemization or separation of optical isomers {1}
403  DF  .~.~> Hydrophenanthrene nucleus {1}
405  DF  .~.~> Aromatic {13}
497  DF  .~.~> Preparing alicyclic acids by carbonylation
498  DF  .~.~> Plural alicyclic rings {2}
503  DF  .~.~> Cyclopentyl (e.g., prostoglandins, etc.) {1}
505  DF  .~.~> Cyclobutyl
506  DF  .~.~> Cyclopropyl
507  DF  .~.~> Alicyclic acids having an element other than oxygen, carbon, or hydrogen
508  DF  .~.~> Alicyclic acids having an oxy, aldehyde, or ketone group
509  DF  .~.~> Alicyclic polycarboxylic acids
510  DF  .~.~> Alicyclic acids having unsaturation
511  DF  .~.~> Naphthenic acids or salts thereof
512  DF  .~.~> Acyclic {14}

DEFINITION

Classification: 562/400

Carboxylic acids and salts thereof:

(under subclass 1) Compounds under Class 532, ... wherein the acid function is a carboxyl group or a salt thereof.

(1) Note. Classification of salt formation from an acid or acid formation from the salt.

As a general rule a multistep synthesis is classified on the basis of the product produced by the last step of the synthesis. The formation of a salt from the corresponding acid or the "springing" of the acid from the corresponding salt is a synthesis step. However, these steps are so commonly used in final recovery procedures of a synthesis, that classification of a process on the basis of the general rule would result in distortion of the placement of patents where special process subclasses have been provided.

(a)

In this classification, where special process subclasses have been provided and the last step of a claimed process appropriate thereto recites a salt formation or a hydrolysis of the salt to the acid, the patent has been placed in the appropriate process subclass.

(b)

As a general rule, a claimed process which combines synthesis steps with purification or recovery is classified with the

synthesis. In those cases where a subclass has been provided for purification or recovery, per se, and the claimed process appropriate thereto recites a broadly defined salt formation of the correspondidng acid or a broadly defined hydrolysis of a salt to the corresponding acid, the patent has been placed in the appropriate purification or recovery subclass. Where the claimed purification or recovery recites a significant salt formation step or a significant hydrolysis of a salt to the corresponding acid, the patent has been placed in the appropriate product subclass and cross-referenced to the purification or recovery subclass. (2) Note. This subclass is residual for alicyclic carboxylic acids not provided for in subclasses 497-511.

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