US PATENT SUBCLASS 521 / 35
.~.~.~ Solid polymer derived 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}
30  DF  .~.~ Chemically treated solid polymer {3}
35.~.~.~ Solid polymer derived from aldehyde or derivative {2}
36  DF  .~.~.~.~> Treated with nitrogen-containing material
37  DF  .~.~.~.~> Treated with sulfur-containing reactant

DEFINITION

Classification: 521/35

(under subclass 30) Subject matter wherein the solid polymer is derived from an aldehyde or derivative thereof.

SEE OR SEARCH CLASS

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

528, Synthetic Resins or Natural Rubbers,

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