US PATENT SUBCLASS 106 / 31.2
.~.~.~.~.~ Specified color former (i.e., electron donating)

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  DF  .~.~.~.~ Chromogenic (i.e., color formation by reaction of color former with color developer) {2}
31.2.~.~.~.~.~ Specified color former (i.e., electron donating) {1}
31.21  DF  .~.~.~.~.~.~> The color former contains a heterocyclic oxygen ring {1}

DEFINITION

Classification: 106/31.2

Specified color former (i.e., electron donating):

(under subclass 31.18) Compositions where the color former (electron donating or proton accepting) is identified.