US PATENT SUBCLASS 528 / 94
.~.~.~.~.~ Nitrogen material contains a nitrogen atom as part of a heterocyclic ring

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}
87  DF  .~.~ From 1,2-epoxy-containing phenolic reactant or with 1,2-epoxy-containing reactant {12}
88  DF  .~.~.~ Polymerizing in the presence of a specified material other than reactant {6}
93  DF  .~.~.~.~ Material contains a nitrogen compound {1}
94.~.~.~.~.~ Nitrogen material contains a nitrogen atom as part of a heterocyclic ring

DEFINITION

Classification: 528/94

(under subclass 93) Subject matter wherein the specified material contains a nitrogen atom as part of a heterocyclic ring.

SEE OR SEARCH CLASS

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