US PATENT SUBCLASS 503 / 210
.~ Heavy metal reactant

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}
210.~ Heavy metal reactant {1}
211  DF  .~.~> Metal of atomic number 22-30 {1}

DEFINITION

Classification: 503/210

Heavy metal reactant:

(under subclass 200) Subject matter in which the color is developed by a chemical change in a compound containing a metal having a specific gravity greater than 4.0.

(1) Note. Excluded here, by the definition of "heavy metal", are the alkali metals, the alkaline earth metals, magnesium and aluminum.