Rub-on security cards

Details Rub-on security cards Rub-on security cards

1977-07-06

1978-08-22

Van Balen, William J.

Stock material or miscellaneous articles

Web or sheet containing structurally defined element or...

Composite having voids in a component

427145, 35 9G, 428916, B41M 500, B41M 512

Patent

active

041090470

ABSTRACT:
Articles in the form of multilayered cards which contain information invisibly printed between a support member and a top member. By rubbing the exposed surface of either the support member or the top member, the information is developed into visible information which can be viewed either through one of the members, i.e., when one of the members is composed of a transparent material, or by physical separation of the members. The multilayered cards are structured similarly to multilayered carbonless copy papers. The information is protected from premature, unauthorized development and detection due to the fact that development thereof creates a chemical change in the multilayered card which cannot be reversed.

REFERENCES:
patent: 3001886 (1961-09-01), Shrewsbury et al.
patent: 3514305 (1970-05-01), Taylor
patent: 3664910 (1972-05-01), Hollie
patent: 3682673 (1972-08-01), Manske
patent: 3914511 (1975-10-01), Vassiliades
patent: 4046404 (1977-09-01), Treier

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