Concealed magnetic indicia

Details Concealed magnetic indicia Concealed magnetic indicia

1989-06-12

1990-05-15

Watts, Douglas D.

Printed matter

Having revealable concealed information, fraud preventer or...

In incorporated magnetic material

283904, 283 74, F16L 3500

Patent

active

049252151

ABSTRACT:
A paper token upon which there is printed an indicia in a first ink which contains iron oxide particles and which indicia is overprinted with a second ink not containing magnetic particles. The first and second inks are dissolvable by the same solvent and the two inks are physically bonded together.

REFERENCES:
patent: 3684869 (1972-08-01), Reiter
patent: 3761683 (1973-09-01), Rogers
patent: 3895220 (1975-07-01), Nelson
patent: 4186944 (1980-02-01), Pearce
patent: 4455039 (1984-06-01), Weitzen et al.
patent: 4511616 (1985-04-01), Pitts et al.

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