US PATENT SUBCLASS 528 / 173
.~.~.~ Carboxylic acid or derivative is a reactant

Current as of: June, 1999
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528 /   HD   SYNTHETIC RESINS OR NATURAL RUBBERS -- PART OF THE CLASS 520 SERIES

*  DD  SYNTHETIC RESINS (Class 520, Subclass 1) {23}
86  DF  .~ FROM PHENOL, PHENOL ETHER, OR INORGANIC PHENOLATE {15}
171  DF  .~.~ Sulfur reactant contains sulfur directly bonded to oxygen {3}
173.~.~.~ Carboxylic acid or derivative is a reactant

DEFINITION

Classification: 528/173

(under subclass 171) Subject matter wherein a carboxylic acid or derivative is a reactant.

(1) Note. A derivative of a carboxylic acid for purposes of this class is limited to esters, amides, imides, lactams, salts, anhydrides, nitriles, lactones, and acyl halides.

(2) Note. The carboxylic acid or derivative may be in any one of the reactants and the sulfur-to-oxygen bond may be in any of the other reactants, or they may be in the same phenolic or nonphenolic reactant.

SEE OR SEARCH THIS CLASS, SUBCLASS:

170, for imides.

271, for a definition of the term "carboxylic acid or derivative thereof".