Latent image printing and development

Details Latent image printing and development Latent image printing and development

Filed on

1976-10-26

Date issued

1980-04-15

Examiner

Pianalto, Bernard D.

Patent Class

Coating processes

SubClass

Restoring or repairing

Other Related Categories

427145, 427261, B32D 3500

Type

Patent

Status

active

Patent number

041984455

Description

ABSTRACT:
This invention relates to materials and methods used in informational, testing, educational, amusement and other paper-based feedback systems embodying invisible images comprising a color-forming reactant material which can be rendered temporarily visible by the application of a coreactant. The systems may also include visible printed images and are suitable for multiple reuse.

REFERENCES:
patent: 456047 (1891-07-01), Meyer
patent: 866293 (1906-08-01), Meyer
patent: 1553556 (1925-09-01), Rogers
patent: 3363336 (1968-01-01), Skinner
patent: 3363337 (1968-01-01), Skinner
patent: 3363338 (1968-01-01), Skinner
patent: 3451143 (1969-06-01), Thomas
patent: 3508344 (1970-04-01), Thomas
patent: 3516177 (1970-06-01), Skinner
Milton Lesser, "Invisible or Sympathetic Inks", American Ink Maker, 11-45, pp. 27-30.

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