US PATENT SUBCLASS 521 / 39
.~.~ From aldehyde or derivative

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}
39.~.~ From aldehyde or derivative

DEFINITION

Classification: 521/39

(under subclass 25) Subject matter wherein an ion-exchange polymer is derived from an aldehyde or derivative thereof.

SEE OR SEARCH CLASS

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

528, Synthetic Resins or Natural Rubbers,

230, for a clarification of the term "aldehyde derivative".