US PATENT SUBCLASS 521 / 43.5
.~.~.~.~.~ Containing carboxylic acid or anhydride group

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

*  DD  SYNTHETIC RESINS (Class 520, Subclass 1) {3}
40  DF  .~ PROCESS OF TREATING SCRAP OR WASTE PRODUCT CONTAINING SOLID ORGANIC POLYMER TO RECOVER A SOLID POLYMER THEREFROM {5}
40.5  DF  .~.~ Process of treating scrap or waste product containing at least one polymer derived from ethylenic unsaturated monomers only {3}
41  DF  .~.~.~ Treating rubber (or rubberlike materials) or polymer derived from a monomer having at least two ethylenic unsaturated moieties {6}
42.5  DF  .~.~.~.~ Treating with organic chalcogen-containing material {3}
43.5.~.~.~.~.~ Containing carboxylic acid or anhydride group

DEFINITION

Classification: 521/43.5

Containing carboxylic acid or anhydride group:

(under subclass 42.5) Subject matter wherein the organic chalcogen material is a carboxylic acid or the anhydride thereof.

SEE OR SEARCH CLASS

520, Synthetic Resins or Natural Rubbers, the Glossary for a definition of the term "carboxylic acid or derivative" which discusses the nature of, inter alia, carboxylic acids and anhydrides.