Non-counterfeitable documents

Details Non-counterfeitable documents Non-counterfeitable documents

1978-05-15

1979-12-04

Spicer, Jr., Robert L.

Printed matter

Calendar

283 6, 427 7, 428916, B42D 1500

Patent

active

041768590

ABSTRACT:
An invalidating marking appears on photoreproductions of security documents such as checks, bonds, stock certificates, lottery tickets, and currency. The invalidating marking is disguised on the original by use of disguising markings and printing the invalidating mark and the background with different line screen frequencies.

REFERENCES:
patent: 3414998 (1968-12-01), Berger
patent: 3852088 (1974-12-01), Godlewski et al.
patent: 4095824 (1978-06-01), Bachman
patent: 4118122 (1978-10-01), Rees et al.

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