US PATENT SUBCLASS 252 / 301.31
.~.~ Five-membered ring having four carbon atoms and one nitrogen 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}
301.31.~.~ Five-membered ring having four carbon atoms and one nitrogen atom

DEFINITION

Classification: 252/301.31

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

SEE OR SEARCH CLASS

548, Organic Compounds,

400+, for compounds, per se, having a five-membered ring composed of four carbon atoms and one nitrogen atom.