US PATENT SUBCLASS 521 / 38
.~.~ 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}
38.~.~ From ethylenically unsaturated reactant only

DEFINITION

Classification: 521/38

(under subclass 25) Subject matter wherein an ion-exchange polymer is derived from ethylenically unsaturated monomers only.