Method and apparatus for printing and prevention of copying of p

Details Method and apparatus for printing and prevention of copying of p Method and apparatus for printing and prevention of copying of p

1998-01-26

2000-08-15

Hilten, John S.

Typewriting machines

Code-printing typewriter

Including coded ink

382101, 705405, 705408, B41J 530

Patent

active

061025925

ABSTRACT:
Postage indicia are printed on mail items using an ink having a characteristic such that the ink is rendered invisible when subjected to light or light and heat of sufficient intensity. When an attempt is made to copy the imprint of a postage indicia on a mail item for which proper accounting has been effected the imprint is subjected to a butst of light or light and heat and the ink becomes invisible and prevents copying of the imprint. The imprint of the postage indicium may overly and obscure a void mark which becomes visible and is copied in the event of attempting to copy the original authentic postage indicium.

REFERENCES:
patent: 4900904 (1990-02-01), Wright et al.
patent: 5302825 (1994-04-01), Abumehdi et al.
International Search Report with enclosures.

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