Security document using a variable dot screen

Details Security document using a variable dot screen Security document using a variable dot screen

1980-02-11

1982-07-27

Bell, Paul A.

Printed matter

Calendar

283 6, B42D 1500

Patent

active

043414044

ABSTRACT:
An improved copy-proof document is disclosed having a cancellation phrase and a background pattern each printed of a plurality of elements of a geometric shape having one or more smaller uncovered areas within said geometrically shaped element.

REFERENCES:
patent: 3802724 (1974-04-01), Gosnell
patent: 4175774 (1979-11-01), Tonges
patent: 4210346 (1980-07-01), Mowry, Jr.
patent: 4227719 (1980-10-01), McElligott
patent: 4227720 (1980-10-01), Mowry, Jr.
patent: 4265469 (1981-05-01), Mowry, Jr.

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