US PATENT SUBCLASS 528 / 163
.~.~.~.~ Nitrogen-containing reactant is a heterocyclic ring compound containing at least one nitrogen atom as a ring member or is nitrogen-containing aromatic compound

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}
86  DF  .~ FROM PHENOL, PHENOL ETHER, OR INORGANIC PHENOLATE {15}
129  DF  .~.~ With aldehyde or derivative {18}
162  DF  .~.~.~ With nitrogen-containing reactant {2}
163.~.~.~.~ Nitrogen-containing reactant is a heterocyclic ring compound containing at least one nitrogen atom as a ring member or is nitrogen-containing aromatic compound

DEFINITION

Classification: 528/163

(under subclass 162) Subject matter wherein the nonphenolic or nonaldehyde or derivative nitrogen reactant (1) contains at least one atom of nitrogen as a ring atom of a heterocyclic ring, or (2) is a compound having at least one nitrogen atom and at least one aromatic ring.

SEE OR SEARCH CLASS

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