US PATENT SUBCLASS 252 / 301.29
.~.~.~ Tri- or tetrazoles

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}
301.27  DF  .~.~ Azole containing {2}
301.29.~.~.~ Tri- or tetrazoles

DEFINITION

Classification: 252/301.29

(under subclass 301.27) Compositions in which the ring contains three or four nitrogen atoms.

SEE OR SEARCH CLASS

548, Organic Compounds,

250, 269.4 for tri- or tetrazole compounds, per se.