Franking machine and method of forming franking impression

Details Franking machine and method of forming franking impression Franking machine and method of forming franking impression

1991-10-10

1994-04-12

Berman, Jack I.

Radiant energy

Coded record and readers; invisible radiant energy type

283 73, 283 85, G06K 712

Patent

active

053028252

ABSTRACT:
A method of forming a franking impression on a mail item and apparatus for forming the franking impression is disclosed. Material which is switchable from one stable state to another stable state by exposure to light of predetermined wavelength is deposited on the mail item while in one state and a selected region of the deposited material is exposed to light of the predetermined wavelength to effect switching of the selected region to the other state and thereby to represent franking or other secure information.

REFERENCES:
patent: 4007462 (1977-02-01), Wetsel, Jr.

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