US PATENT SUBCLASS 528 / 492
.~.~.~ Nitrogen containing

Current as of: June, 1999
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528 /   HD   SYNTHETIC RESINS OR NATURAL RUBBERS -- PART OF THE CLASS 520 SERIES

*  DD  SYNTHETIC RESINS (Class 520, Subclass 1) {23}
480  DF  .~ TREATING POLYMER CONTAINING MATERIAL OR TREATING A SOLID POLYMER OR A RESINIFIABLE INTERMEDIATE CONDENSATION PRODUCT {14}
491  DF  .~.~ Contacting with organic material {5}
492.~.~.~ Nitrogen containing

DEFINITION

Classification: 528/492

(under subclass 491) Processes wherein the organic compound is a nitrogen-containing compound.