US PATENT SUBCLASS 106 / 31.14
.~.~.~ Invisible

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.~.~.~ Invisible {4}
31.15  DF  .~.~.~.~> Fluorescent
31.16  DF  .~.~.~.~> Chromogenic (i.e., color formation by reaction of color former with color developer) {2}
31.23  DF  .~.~.~.~> Erasable composition
31.24  DF  .~.~.~.~> Protein, carbohydrate, or wax containing

DEFINITION

Classification: 106/31.14

Invisible:

(under subclass 31.13) Coating or plastic compositions specifically designed to be an invisible ink, which may be activated by any known means to produce a visible ink (e.g., by the action of heat, light, or other subsequent treatment).

SEE OR SEARCH CLASS

520, Synthetic Resins or Natural Rubbers, appropriate

subclasses, particularly Class 523,

161, for a composition containing a synthetic resin or natural rubber having utility as an invisible ink or to processes of preparing said composition.