Latent image printing process and apparatus and substrate theref

Details Latent image printing process and apparatus and substrate theref Latent image printing process and apparatus and substrate theref

1996-05-23

1997-10-28

Tran, Huan H.

Incremental printing of symbolic information

Thermal marking apparatus or processes

347221, B41J 232, B41M 526, B41M 528

Patent

active

056821930

ABSTRACT:
A latent image printing method and apparatus uses a substrate with one main surface having a covering comprising one of a first pair of a color developer and color former dye defining a background color in conjunction with the one main surface, wherein the color developer and the color former dye react when mixed to produce a first spectral response which is visible relative to the background color and a continuous coating over the covering which is non-porous with respect to the other of the pair and solvent-resistant to the other of the pair. The coating above selected portions of the covering corresponding to a desired latent image is removed.

REFERENCES:
patent: 5424266 (1995-06-01), Gundjian
patent: 5476830 (1995-12-01), Gundjian
patent: 5532200 (1996-07-01), Gundjian

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