US PATENT SUBCLASS 528 / 216
.~.~.~.~.~ Nitrogen-containing material is a heterocyclic compound containing at least one nitrogen atom as a ring member

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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}
86  DF  .~ FROM PHENOL, PHENOL ETHER, OR INORGANIC PHENOLATE {15}
212  DF  .~.~ Phenolic reactant contains a single phenolic -OH group or a single inorganic phenolate thereof {2}
214  DF  .~.~.~ Polymerizing in the presence of a specified material other than a reactant and other than Group IA or Group IIA material as sole metal atom {2}
215  DF  .~.~.~.~ Material is a nitrogen-containing compound {1}
216.~.~.~.~.~ Nitrogen-containing material is a heterocyclic compound containing at least one nitrogen atom as a ring member

DEFINITION

Classification: 528/216

(under subclass 215) Subject matter wherein the specified nitrogen-containing material contains at least one nitrogen atom as a ring member of a heterocyclic compound.

SEE OR SEARCH CLASS

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