US PATENT SUBCLASS 252 / 301.22
.~.~ Heterocyclic compounds having an intercyclic acyclic methine linkage

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}
301.22.~.~ Heterocyclic compounds having an intercyclic acyclic methine linkage {2}
301.23  DF  .~.~.~> Triazines
301.24  DF  .~.~.~> Thiazoles or oxazoles

DEFINITION

Classification: 252/301.22

(under subclass 301.21) Compositions which contain a heterocyclic compound having two cyclic nuclei joined together through a straight chain linkage containing at least one methine group.