Radiation imagery chemistry: process – composition – or product th – Registration or layout process other than color proofing
Patent
1993-11-04
1995-11-21
Rosasco, S.
Radiation imagery chemistry: process, composition, or product th
Registration or layout process other than color proofing
430 10, 430354, 430952, 355 77, 283 91, G03F 900
Patent
active
054685818
ABSTRACT:
A security document with a design (e.g. a generally oval seal) is constructed in such a way that the design is full value halftone, such as produced from juxtaposed line screens having a frequency between 100-133 lines per inch. Negative and positive masks having an image (e.g. arabic numeral, letter, or other symbol), are used with the screens to produce a printing plate. A document is printed with the printing plate in a conventional lithographic process, and there is an overprinting on the design (at least that portion having the image) with a white opaque ink or overprint varnish to produce an image. The image is not readily visible to the naked human eye when viewed generally perpendicular to the plane of the document, but is readily visible by the naked human eye when the document is tilted so that it is viewed distinctly non-perpendicular to the plane of the document. A fluorescent material or brightener may be added to the white ink, and the image will then also be visible by shining long wave length black light on the design.
REFERENCES:
patent: 4033059 (1977-07-01), Hutton et al.
patent: 4143967 (1979-03-01), Wicker
patent: 4210345 (1980-07-01), Kosche
patent: 4265469 (1981-05-01), Mowry, Jr. et al.
patent: 4715623 (1987-12-01), Roule et al.
patent: 4932685 (1990-06-01), Mancuso
The Printing Ink Manual, Van Nostrand Reinhold, 1979, pp. 58, 128, 189, 190.
Blend Theodore
Coe Robert P.
Moore Business Forms Inc.
Rosasco S.
LandOfFree
Verification latent image does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Verification latent image, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Verification latent image will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1135875