US PATENT SUBCLASS 252 / 301.21
.~ Optical brightening compositions

Current as of: June, 1999
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252 /   HD   COMPOSITIONS

301.16  DF  ORGANIC LUMINESCENT MATERIAL CONTAINING COMPOSITIONS {6}
301.21.~ Optical brightening compositions {6}
301.22  DF  .~.~> Heterocyclic compounds having an intercyclic acyclic methine linkage {2}
301.25  DF  .~.~> Azine containing
301.26  DF  .~.~> Six-membered ring having one hetero-N-atom
301.27  DF  .~.~> Azole containing {2}
301.31  DF  .~.~> Five-membered ring having four carbon atoms and one nitrogen atom
301.32  DF  .~.~> Hetero-S-atom or hetero-O-atom containing

DEFINITION

Classification: 252/301.21

(under subclass 301.16) Compositions which are to be applied to or incorporated in materials in order to obtain a bleaching effect or a whiter appearance in daylight.