Security documents

Details Security documents Security documents

1993-03-22

1994-11-22

Goodrow, John

Radiation imagery chemistry: process, composition, or product th

Imaged product

Antifraud or antitampering

430 47, G03G 1522

Patent

active

053668332

ABSTRACT:
A method for making security documents using an electro photographic printer, particularly a photocopier or laser printer, includes the step of exposing the printed image to an accelerator, in liquid or vapour form. Under the influence of the accelerator, a second dye contained in the toner, used in producing the image, migrates into the document, thereby producing a second image in the paper in registration with the printed image. The process is applicable to images created on paper, security paper, and synthetic papers.

REFERENCES:
patent: 4579754 (1986-04-01), Maurer et al.
patent: 4680458 (1987-07-01), Drexler
patent: 4903254 (1990-02-01), Haas

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