Counterfeit resistant document

Details Counterfeit resistant document Counterfeit resistant document

1978-01-05

1979-11-27

Vlachos, Leonidas

Printed matter

Calendar

283 17, 283 58, 428211, B42D 1500

Patent

active

041757769

ABSTRACT:
A counterfeit resistant document having a set of indicia on a background field. The set of indicia and the background field are characterized by different optical reflectivities for incident light having wavelengths within the response spectrum of the human eye, and are substantially non-absorbing with respect to incident light having wavelengths within the response spectrum of color xerographic copying machines. The document includes two types of ink particles deposited on a substrate, with the types of ink particles having different, non-uniform spatial distributions over the background field, and at least a first type being substantially non-absorbing with respect to light in the response spectrum of a color copier. The distributions define the indicia set by providing that substantially no ink particles of the first type overlie the substrate within the contours of the indicia, and particles of that type immediately surround those contours, so that a uniform optical reflectivity is present over the indicia and immediately surrounding the background field for incident light having wavelengths within the copier spectrum.

REFERENCES:
patent: 1002600 (1911-09-01), Morris et al.
patent: 1692405 (1928-11-01), Freeman
patent: 2255696 (1941-09-01), Clifford
patent: 3597082 (1971-08-01), James et al.
patent: 3675948 (1972-07-01), Wicker
patent: 3713861 (1973-01-01), Sharp
patent: 3852088 (1974-12-01), Godlewski
patent: 3887742 (1975-06-01), Reinnagel

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