Latent image printing and development

Details Latent image printing and development Latent image printing and development

1975-09-24

1980-02-12

Robinson, Ellis P.

Stock material or miscellaneous articles

Article having latent image or transformation

35 9G, 106 21, 427145, 428199, 428411, 428537, D21H 510, B44F 110

Patent

active

041884310

ABSTRACT:
This invention relates to alkali developable, paper-based systems printed with invisible phenolphthalein inks and made reusable through many development cycles by employing critical concentrations of dye reactants in conjunction with a paper having a defined water soluble acidity-alkalinity.

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, Nov. 1945, pp. 27-30.

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