US PATENT SUBCLASS 528 / 327
.~.~.~ Heterocyclic reactant or a reactant which contains a nitrogen atom bonded directly to another nitrogen atom

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}
271  DF  .~ FROM CARBOXYLIC ACID OR DERIVATIVE THEREOF {10}
310  DF  .~.~ From imide- or lactam-containing compound, or from an amino-nitrogen containing carboxylic acid, or derivative of an amino-nitrogen-containing carboxylic acid {9}
327.~.~.~ Heterocyclic reactant or a reactant which contains a nitrogen atom bonded directly to another nitrogen atom

DEFINITION

Classification: 528/327

(under subclass 310) Subject matter wherein at least one reactant contains a heterocyclic ring atom, or wherein one reactant contains at least one nitrogen atom bonded directly to another nitrogen atom.

(1) Note. Included in this subclass are n-carboanhydrides.

SEE OR SEARCH CLASS

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