US PATENT SUBCLASS 252 / 301.32
.~.~ Hetero-S-atom or hetero-O-atom containing

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}
301.32.~.~ Hetero-S-atom or hetero-O-atom containing

DEFINITION

Classification: 252/301.32

(under subclass 301.21) Compositions which contain a heterocyclic compound which contains either oxygen or sulfur as a hetero atom.

SEE OR SEARCH CLASS

549, Organic Compounds,

1+, for sulfur containing hetero rings and subclasses 200+ for hetero-O-atom compounds, per se.