Method for reducing invalid acceptances of expired printed offer

Details Method for reducing invalid acceptances of expired printed offer Method for reducing invalid acceptances of expired printed offer

1996-01-02

1998-01-13

Beck, Shrive

Coating processes

Fraud or tamper detecting

116206, 116208, 283 95, 283 51, 283901, B41M 314

Patent

active

057076804

ABSTRACT:
There is disclosed a method for the time-delayed defacement of all or part of a printed work, such as a time-dependent coupon. Such method comprises applying opaque print onto a substrate and applying an opacity-labile composition of lesser nascent opacity than the visible print onto the substrate in such a manner that a change in the opacity of the opacity-labile composition causes a time-delayed defacement of the printed substrate.

REFERENCES:
patent: 1167566 (1916-01-01), Jenkins

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