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

1997-03-31

1998-06-30

Tran, Huan H.

Incremental printing of symbolic information

Thermal marking apparatus or processes

347221, 503201, 503206, 503226, B41M 526, B41M 528, B41J 232

Patent

active

057741603

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: 5532200 (1996-07-01), Gundjian
patent: 5682193 (1997-10-01), Gundjian

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