US PATENT SUBCLASS 503 / 220
.~.~ Furanone moiety-containing

Current as of: June, 1999
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503 /   HD   RECORD RECEIVER HAVING PLURAL INTERACTIVE LEAVES OR A COLORLESS COLOR FORMER, METHOD OF USE, OR DEVELOPER THEREFOR

200  DF  HAVING A COLORLESS COLOR-FORMER, DEVELOPER THEREFOR, OR METHOD OF USE {16}
218  DF  .~ Identified color-former {4}
220.~.~ Furanone moiety-containing {1}
221  DF  .~.~.~> Fluoran or derivative {1}

DEFINITION

Classification: 503/220

Furanone moiety-containing:

(under subclass 218) Subject matter wherein the color-former contains the phthalide or furanone moiety, viz.: [figure]