Printed matter – Having revealable concealed information – fraud preventer or... – Utilizing electromagnetic radiation
Patent
1992-08-10
1994-03-29
Bell, Paul A.
Printed matter
Having revealable concealed information, fraud preventer or...
Utilizing electromagnetic radiation
283902, B42D 1500
Patent
active
052978150
ABSTRACT:
A security document that provides an indication it is a copy when copied by a photocopy machine has printed background pattern and warning printer matter interspersed with blank areas of a substrate to provide a distinct intermeshed pattern so that the warning printed matter is indistinguishable from the printed background by the human eye. The printed background comprises a number of parallel lines of a size such that they will be resolved by a photocopy machine, while the warning printed matter comprises geometric elements (typically circular dots) of a size less than that which can be resolved by a photocopy machine. The dots are disposed in a geometric continuation of at least some of the lines from the printed background, and are configured to form invalidating indicia of the document is copied by a photocopy machine. The printed background pattern and warning printed matter typically have a density of less than 20%, such as about 7-11%. The warning printed matter may be in the form of at least one outline letter configuration, in which case second lines, making an angle of about 20-70% with respect to the first lines, are provided within the outline letter configuration.
REFERENCES:
patent: 4780397 (1988-10-01), Tsuchiya
patent: 5149140 (1992-09-01), Mowry, Jr. et al.
patent: 5197765 (1993-03-01), Mowry, Jr. et al.
Anderson Mark J.
Roseberry Arnold
Bell Paul A.
Moore Business Forms Inc.
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