Printed matter – Having revealable concealed information – fraud preventer or... – Utilizing electromagnetic radiation
Patent
1991-07-12
1993-03-30
Bell, Paul A.
Printed matter
Having revealable concealed information, fraud preventer or...
Utilizing electromagnetic radiation
283 94, 283 95, 283902, B42D 1500
Patent
active
051977656
ABSTRACT:
An improved security document which protects documents from copying on color copying machines. The document has cancellation terms and background pattern in two tones. If the copier is adjusted to obscure the cancellation term on reproduced copies at one tone, the cancellation at the other tone will appear. In an alternative embodiment, the density of the cancellation term and the background pattern vary across the face of the document. In this case, the cancellation term will appear somewhere on the copy no matter what copier adjustments are made.
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Morgenstein Letter to Mr. Leonard Walle, Mar. 21, 1977.
Kane John F.
Mowry, Jr. William H.
Simpson John S.
Sink Alan L.
Stubbs George W.
Bell Paul A.
The Standard Register Company
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