US PATENT SUBCLASS 503 / 221
.~.~.~ Fluoran or derivative

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  DF  .~.~ Furanone moiety-containing {1}
221.~.~.~ Fluoran or derivative {1}
222  DF  .~.~.~.~> Molecule having plural fluorans or more than three rings fused together

DEFINITION

Classification: 503/221

Fluoran or derivative:

(under subclass 200) Subject matter wherein the color-former

is 0-phenolphthalien anhydride (dihydroxydiphenyl phthalide anhydride) or compound derived from it by substitution for a hydrogen. [figure]