US PATENT SUBCLASS 252 / 301.26
.~.~ Six-membered ring having one hetero-N-atom

Current as of: June, 1999
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252 /   HD   COMPOSITIONS

301.16  DF  ORGANIC LUMINESCENT MATERIAL CONTAINING COMPOSITIONS {6}
301.21  DF  .~ Optical brightening compositions {6}
301.26.~.~ Six-membered ring having one hetero-N-atom

DEFINITION

Classification: 252/301.26

(under subclass 301.21) Compositions which contain a heterocyclic compound having a hexatomic ring made up of five carbon atoms and one nitrogen atom.

SEE OR SEARCH CLASS

546, Organic Compounds,

1+, for compounds, per se, having a six-membered ring consisting of five ring carbons and one ring nitrogen.