US PATENT SUBCLASS 503 / 219
.~.~ And identified inorganic electron acceptor (developer), other than mere clay

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}
219.~.~ And identified inorganic electron acceptor (developer), other than mere clay

DEFINITION

Classification: 503/219

And identified inorganic electron acceptor (developer) other than mere clay:

(under subclass 218) Subject matter in which a claim names an inorganic material other than clay, which has acid characteristics sufficient to bring out the color-former contacted therewith.

(1) Note. This subclass provides for clay which has been subjected to a specified treatment to alter or enhance its activity or characteristics.