US PATENT SUBCLASS 521 / 31
.~.~.~ Solid polymer derived from ethylenically unsaturated reactant only

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}
25  DF  .~ ION-EXCHANGE POLYMER OR PROCESS OF PREPARING {7}
30  DF  .~.~ Chemically treated solid polymer {3}
31.~.~.~ Solid polymer derived from ethylenically unsaturated reactant only {2}
32  DF  .~.~.~.~> Treated with nitrogen-containing material
33  DF  .~.~.~.~> Treated with sulfur-containing material

DEFINITION

Classification: 521/31

(under subclass 30) Subject matter wherein the ion-exchange polymer is derived by the polymerization of only ethylenically unsaturated reactants.

SEE OR SEARCH CLASS

520, Synthetic Resins or Natural Rubbers, the Glossary, for a definition of the term "ethylenically unsaturated".