US PATENT SUBCLASS 503 / 217
.~.~ And 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}
216  DF  .~ Identified organic electron acceptor (developer) other than phenolic resin {1}
217.~.~ And identified color-former

DEFINITION

Classification: 503/217

And identified color-former:

(under subclass 216) Subject matter in which a claim names a substance which, under the influence of contact with the developer, changes from colorless or otherwise ineffective for to a colored form or other state suitable for recording information.