US PATENT SUBCLASS 106 / 31.16
.~.~.~.~ Chromogenic (i.e., color formation by reaction of color former with color developer)

Current as of: June, 1999
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106 /   HD   COMPOSITIONS: COATING OR PLASTIC

*  DD  COATING OR PLASTIC COMPOSITIONS {40}
31.01  DF  .~ Marking {14}
31.13  DF  .~.~ Inks {6}
31.14  DF  .~.~.~ Invisible {4}
31.16.~.~.~.~ Chromogenic (i.e., color formation by reaction of color former with color developer) {2}
31.17  DF  .~.~.~.~.~> Specified developer (i.e., electron acceptor) {1}
31.2  DF  .~.~.~.~.~> Specified color former (i.e., electron donating) {1}

DEFINITION

Classification: 106/31.16

Chromogenic (i.e., color formation by reaction of color former with color developer):

(under subclass 31.14) Compositions which develop a color by contacting a color former compound (electron donor) with a color developer compound (electron acceptor) in a manner to cause reaction.