Method for protecting against duplication with a color copier

Details Method for protecting against duplication with a color copier Method for protecting against duplication with a color copier

1995-06-16

1999-09-14

Resan, Stevan A.

Record receiver having plural interactive leaves or a colorless

Having a colorless color-former, developer therefor, or...

Method of use, kit, or combined with marking instrument or...

503206, 503207, 283 67, 283 95, 283902, 428207, 428333, 428531, 428915, 428916, B41M 520, B42D 1500

Patent

active

RE0363065

ABSTRACT:
A method for protecting against duplication of a document with a color copier comprises providing a background color on a document having an average reflectance value and printing on the background with a contrast color having a spectral characteristic which modulates the average reflectance value by no more than 5% and has an average value equal to the average reflectance value. The contrast color is printed with a printing medium that allows activation by a rub and reveal action or by application of intense light.

REFERENCES:
patent: 4629630 (1986-12-01), Devrient
patent: 4846502 (1989-07-01), Chang
patent: 5058925 (1991-10-01), Dotson
patent: 5209515 (1993-05-01), Dotson et al.

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