Printed matter – Having revealable concealed information – fraud preventer or... – Utilizing electromagnetic radiation
Patent
1988-10-18
1990-07-31
Dees, Jose
Printed matter
Having revealable concealed information, fraud preventer or...
Utilizing electromagnetic radiation
430 10, 430394, 430396, 430494, 283 67, 283 74, 283902, 1014501, 101468, B42D 1500
Patent
active
049445332
ABSTRACT:
There is provided a process for preparing a film positive sheet for a forging-by-copying-proof print in which a first background image sheet is placed on a first latent image sheet, an unexposed film having a photosensitive membrane on the undersurface is placed on the background sheet to provide a primary three-layer film structure, the three-layer film structure is illuminated to partially expose the film, the first latent image and background sheets are replaced by second latent image and second background sheets, respectively, to provide a secondary three-layer film structure, the secondary three-layer film structure is illuminated to completely expose the partially exposed film and the second latent image and background sheets are removed from the secondary three-layer structure to thereby provide a film positive sheet for a forging-by-copying-proof print. Then, a forging-by-copying-proof print is prepared from the film positive sheet by a printing method such as offset or relief printing.
Dees Jose
Hosokawa Printing Co., Ltd.
Weddington J.
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