Printed matter – Having revealable concealed information – fraud preventer or... – Utilizing electromagnetic radiation
Patent
1984-09-28
1987-12-29
Goldberg, Howard N.
Printed matter
Having revealable concealed information, fraud preventer or...
Utilizing electromagnetic radiation
283 74, 283 85, 283113, 101150, 428167, G09F 300, G09F 1916
Patent
active
047156236
ABSTRACT:
A method of impressing a secret pattern on a substrate by the use of an uninked intaglio printing plate having the foreground area with a pattern of ridges and grooves which are distinctively different from the ridges and grooves in a background area enclosing the foreground area. The secret pattern may be observed only a person who is informed as to what pattern he is looking for and how to look at that pattern. Particularly, his line of sight must make a certain angle with the plane of the impressed substrate. The line of sight must also be oriented properly with respect to the background and foreground areas.
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Cantor Joshua C.
Roule Richard L.
American Bank Note Company
Goldberg Howard N.
Ross T.
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