US PATENT SUBCLASS 528 / 399
.~.~ Phosphorus reactant contains a nitrogen atom

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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}
398  DF  .~ FROM PHOSPHORUS-CONTAINING REACTANT {2}
399.~.~ Phosphorus reactant contains a nitrogen atom

DEFINITION

Classification: 528/399

(under subclass 398) Subject matter wherein at least one reactant contains at least one phosphorus atom and at least one nitrogen atom.