Use of encapsulated ink for enhancing postage meter security

Details Use of encapsulated ink for enhancing postage meter security Use of encapsulated ink for enhancing postage meter security

1994-06-20

1995-05-09

Yan, Ren

Printing

Embossing or penetrating

Special-article machines

101 16, 101 27, 101 32, B41F 1902

Patent

active

054130379

ABSTRACT:
Apparatus and method for enhancing the security of mechanical postage meters through use of an encapsulated fluorescence quenching substance. An encapsulated quenching substance is blended with red fluorescent inks that are used to print postage indicia. The fluorescent quenching substance that is encapsulated has the characteristic of reacting with the fluorescent dye in the ink to cause a bathochromic shift of the wave length where reflectance occurs. By designing the printhead of the postage meter in an appropriate way, a portion of the encapsulated substance can be ruptured during printing of the postage indicia, thereby providing an area where the bathochromic shift has occurred. Thereafter, the indicia can be exposed to ultraviolet light and a determination can be made whether the postage indicia has been printed by a postage meter by inspecting the portion of the indicia where a bathochromic shift is expected.

REFERENCES:
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patent: 4641346 (1987-02-01), Clark et al.
patent: 4649266 (1987-03-01), Eckert
patent: 4920361 (1990-04-01), Arahara et al.
patent: 4933849 (1990-06-01), Connell et al.
patent: 5114478 (1992-05-01), Auslander et al.

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