Authenticity mark, document carrying such mark, and process and

Details Authenticity mark, document carrying such mark, and process and Authenticity mark, document carrying such mark, and process and

1989-10-10

1991-05-28

Arnold, Bruce Y.

Printed matter

Maps

350109, 40615, 283 72, G02B 5128

Patent

active

050188305

ABSTRACT:
Authenticity mark consisting of pattern of randomly divided granules attached to a delimited surface area of a substrate. The granules consist of retroreflective microspheres with a diameter smaller than 500 micron and that the number of microspheres is selected such that between 20% and 80% of the available surface of the delimited area is covered by the microspheres.

REFERENCES:
patent: 3514872 (1964-11-01), Nordgren
patent: 3801183 (1974-04-01), Sevelin et al.
patent: 3999042 (1976-12-01), Silverman et al.
patent: 4183554 (1980-01-01), Howard, Jr.
patent: 4303307 (1981-12-01), Tureck et al.
patent: 4620727 (1986-11-01), Stockburger et al.
patent: 4648932 (1987-03-01), Bailey
patent: 4688894 (1987-08-01), Hockert
patent: 4763985 (1988-08-01), Bingham
patent: 4968063 (1990-11-01), McConville et al.

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