Document security system

Details Document security system Document security system

1984-05-08

1986-04-15

Bell, Paul A.

Printed matter

Having revealable concealed information, fraud preventer or...

Utilizing superposed layers

283 93, 283902, 355133, B42D 1500

Patent

active

045823464

ABSTRACT:
A protected document includes background printed background matter and line pattern printed warning indicia. The warning indicia is slurrable upon copying to become visible.

REFERENCES:
patent: 4168088 (1979-09-01), Somlyody
patent: 4310180 (1982-01-01), Mowry, Jr. et al.
patent: 4351547 (1982-09-01), Brooks
patent: 4420175 (1983-12-01), Mowry, Jr. et al.
Xerox Corporation Internal Memo May 22, 1975, from R. F. Lehman to A. Morganstein.

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