Printed security with hallmarks

Details Printed security with hallmarks Printed security with hallmarks

1984-08-23

1986-05-27

Pitts, Harold I.

Registers

Records

Magnetic

235448, 235451, G06K 1906

Patent

active

045917078

ABSTRACT:
This invention relates to a security paper with a hallmark in the form of a coating applied by vacuum deposition techniques to the surface of a paper substrate. The coating is very thin and almost invisible to the naked eye even as a metal layer, although permitting accurate automatic or machine examination for verification purposes. the absorption of the hallmarks in a certain range of the wavelength of the spectrum, the exiting spcetrum of luminescence, the photoconductivity and/or the electrical conductivity of the hallmarks are characteristics used during the automatic examination of the authenticity of the security paper.

REFERENCES:
patent: 3829373 (1974-08-01), Kuehnle
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
patent: 4455039 (1984-06-01), Weitzen

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