G - Physics – 03 – F
Patent
G - Physics
03
F
95/14, 283/26, 8
G03F 5/14 (2006.01)
Patent
CA 1110476
ABSTRACT OF THE DISCLOSURE A latent image of an object which appears to be invisible to the unaided eye is formed on a substrate by photographing the object through a half tone screen to produce at least one halftone image of the object, thereafter placing the halftone image in reg- istry with a strip of light sensitive film and a dark screen having therein a plurality of extremely small apertures arranged in parallel rows oriented in predetermined angular offset relation, for instance 30° to the rows of halftone dots forming the halftone image, exposing the strip of film to the halftone image through the small openings in the screen, developing the exposed film to produce thereon the latent image of the object, and then imprinting the latent image on said substrate. The printed image can be viewed through another dark screen having apertures smaller than those in the first-named screen, and will appear automatically on the face of any print made of the substrate by means of a xerographic process or the like. -1-
320767
Haggquist Benjamin J.
Marks & Clerk
LandOfFree
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