US PATENT SUBCLASS 524 / 298
.~.~.~.~.~.~.~.~.~.~ Three or more carboxylic acid or ester groups

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

*  DD  SYNTHETIC RESINS (Class 520, Subclass 1) {1}
*  DD  .~ PROCESSES OF PREPARING A DESIRED OR INTENTIONAL COMPOSITION OF AT LEAST ONE NONREACTANT MATERIAL AND AT LEAST ONE SOLID POLYMER OR SPECIFIED INTERMEDIATE CONDENSATION PRODUCT, OR PRODUCT THEREOF (Class 523, subclass 1) {17}
1  DF  .~.~ Adding a NRM to a preformed solid polymer or preformed specified intermediate condensation product, composition thereof; or process of treating or composition thereof {31}
80  DF  .~.~.~ DNRM which is other than silicon dioxide, glass, titanium dioxide, water, halohydrocarbon, hydrocarbon, or elemental carbon {4}
81  DF  .~.~.~.~ Organic DNRM {21}
284  DF  .~.~.~.~.~ Carboxylic acid or derivative and wherein the derivative is other than a metal salt DNRM {3}
287  DF  .~.~.~.~.~.~ Aryl group {5}
294  DF  .~.~.~.~.~.~.~ Two or more carboxylic acids or ester groups each directly attached to a nuclear carbon of the same aryl group through the carbonyl of the carboxylic acid or ester group {1}
295  DF  .~.~.~.~.~.~.~.~ A single aryl group {1}
296  DF  .~.~.~.~.~.~.~.~.~ Only two carboxylic acid or ester groups directly attached to an aryl group, e.g., phthalic acid, etc. {2}
298.~.~.~.~.~.~.~.~.~.~ Three or more carboxylic acid or ester groups

DEFINITION

Classification: 524/298

Three or more carboxylic acid or ester groups:

(under subclass 296) Subject matter wherein the carboxylic acid or ester derivative contains three or more COOH or COOR groups, only two of which are directly attached through the carbon atom of the COOH or COOR group to the aryl ring, e.g., etc. [figure]