US PATENT SUBCLASS 503 / 218
.~ Identified color-former

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.~ Identified color-former {4}
219  DF  .~.~> And identified inorganic electron acceptor (developer), other than mere clay
220  DF  .~.~> Furanone moiety-containing {1}
223  DF  .~.~> Azole moiety-containing
224  DF  .~.~> Polyphenylmethane moiety-containing

DEFINITION

Classification: 503/218

Identified color-former:

(under subclass 200) Subject matter wherein a substance is named in the claims which changes from a colored form or other state suitable for recording information.