Copy-proof sheet

Details Copy-proof sheet Copy-proof sheet

1990-12-03

1992-01-07

Echols, P. W.

Printed matter

Having revealable concealed information, fraud preventer or...

Utilizing electromagnetic radiation

283902, B42D 1500

Patent

active

050784285

ABSTRACT:
A copy-proof sheet having a longitudinal axis, and being constituted by a background and at least one latent mark, at least one of the background and the latent mark being formed of multi-line images of about 65-line 10% which are reproducible on a copy obtained from the sheet, the other of the background and the latent mark being formed of fine mesh images of about 150-line 10% which are not reproducible on a copy obtained from the sheet; the background and latent mark being distinguishable on the obtained copy due to a difference in color tone; the multi-line images being made up of longitudinal line-containing and lateral line-containing square areas each having sides of about 3 mm long; each longitudinal line-containing square area being made up of lines oriented parallel to the longitudinal axis of the sheet, and each lateral line-containing square area being made up of lines oriented normal to the longitudinal axis; and the longitudinal line-containing and lateral line-containing squares being juxtaposed alternately with an inclination 45.degree. to the longitudinal axis.

REFERENCES:
patent: 4227719 (1980-10-01), McElligott et al.
patent: 4420175 (1983-12-01), Mowry, Jr.
patent: 4582346 (1986-04-01), Caprio et al.
patent: 4944533 (1990-07-01), Tsuchiya

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