US PATENT SUBCLASS 106 / 31.21
.~.~.~.~.~.~ The color former contains a heterocyclic oxygen ring

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  DF  .~.~.~.~.~ Specified color former (i.e., electron donating) {1}
31.21.~.~.~.~.~.~ The color former contains a heterocyclic oxygen ring {1}
31.22  DF  .~.~.~.~.~.~.~> Fluoran or derivative containing

DEFINITION

Classification: 106/31.21

The color former contains a heterocyclic oxygen ring:

(under subclass 31.2) Compositions wherein the color former contains a heterocyclic ring having a ring oxygen atom.

(1) Note. A heterocyclic oxygen ring herein is a ring that contains carbon, oxygen, and optionally nitrogen, sulfur, selenium or tellurium as the only ring members.