US PATENT SUBCLASS 503 / 224
.~.~ Polyphenylmethane 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}
224.~.~ Polyphenylmethane moiety-containing

DEFINITION

Classification: 503/224

Polyphenylmethane moiety-containing:

(under subclass 218) Subject matter in which the color-former molecule has a single acyclic carbon atom between at least two benzene rings.