US PATENT SUBCLASS 521 / 36
.~.~.~.~ Treated with nitrogen-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}
35  DF  .~.~.~ Solid polymer derived from aldehyde or derivative {2}
36.~.~.~.~ Treated with nitrogen-containing material

DEFINITION

Classification: 521/36

(under subclass 35) Subject matter wherein the solid polymer is chemically treated with a nitrogen-containing material.

SEE OR SEARCH CLASS

525, Synthetic Resins or Natural Rubbers,

472+, for a chemical modification of a solid polymeric material derived from an aldehyde or derivative thereof.