Printed security with hallmarks

Details Printed security with hallmarks Printed security with hallmarks

1985-01-02

1987-09-08

Morgenstern, Norman

Printed matter

Method

Identifying

283 83, 283 92, 20419228, 427 7, 427157, B42D 1500

Patent

active

046919406

ABSTRACT:
The invention relates to a printed security with a hallmark in the form of a coating applied in a vacuum to the surface of the security. This coating is so thin that it is almost invisible even as a metal layer, while at the same time permitting accurate automatic examination. The absorption characteristics of the security are preferably measured in a certain range of the wavelength of the spectrum.

REFERENCES:
patent: 2872341 (1959-02-01), Stein
patent: 3506556 (1970-04-01), Gilery et al.
patent: 3829373 (1974-08-01), Kuehnle
patent: 3905887 (1975-09-01), Kuehnle
patent: 3984587 (1976-10-01), Lipp
patent: 4000458 (1976-12-01), Lorimer et al.
patent: 4114032 (1978-09-01), Brosow et al.
patent: 4146792 (1979-03-01), Stenzel et al.
patent: 4157784 (1979-06-01), Grottrup et al.
patent: 4181251 (1980-01-01), Becker

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