Printed matter – Having revealable concealed information – fraud preventer or... – Cryptogram
Patent
1992-10-29
1994-04-12
Eley, Timothy V.
Printed matter
Having revealable concealed information, fraud preventer or...
Cryptogram
283 17, 283902, 380 54, B42D 1500
Patent
active
053019814
ABSTRACT:
A copy preventing sheet-form screen comprises a lenticular screen formed by a sheet of transparent plastic material having, a series of adjacent lens portions with major optical axes perpendicular to the front face and a series of light blocking striae located spaced apart underlying respective lens portions. The striae extend across a major part of the major optical axes so that when covering a sheet printed with meaningful information, the screen enables the information to be easily seen when viewed obliquely in ambient white light but prevents a meaningful copy thereof being made by conventional, perpendicularly aligned, phototransference techniques. The screen can be attached to the printed sheet by adhesive or formed as an adhesive tape to cover only preselected areas of printing. The screen may also form one or both sides of a security envelope enclosing the printed sheet and sealed by a security label carrying an authorized signature.
REFERENCES:
patent: 3151520 (1964-10-01), Nadean
patent: 3178993 (1965-04-01), Ferris et al.
patent: 4498736 (1985-02-01), Griffin
patent: 4557505 (1985-12-01), Schaefer et al.
patent: 4912761 (1990-03-01), Tan et al.
patent: 5071061 (1991-12-01), Willis
patent: 5197663 (1993-03-01), Stude
Docusafe, Ltd.
Eley Timothy V.
Fridie Jr. Willmon
Usher Robert W. J.
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