US PATENT SUBCLASS 521 / 33
.~.~.~.~ Treated with sulfur-containing material

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  DF  .~.~.~ Solid polymer derived from ethylenically unsaturated reactant only {2}
33.~.~.~.~ Treated with sulfur-containing material

DEFINITION

Classification: 521/33

(under subclass 31) Subject matter wherein the solid polymer is chemically treated with a sulfur-containing material.

(1) Note. The sulfur-containing material usually renders the polymer cationic in character.