Method of using thermochromic material on security documents and

Details Method of using thermochromic material on security documents and Method of using thermochromic material on security documents and

1995-05-01

1998-10-27

Fridie, Jr., Willmon

Printed matter

Method

283 70, B42D 1500

Patent

active

058269150

ABSTRACT:
A method of document security comprising providing a substrate having a spot of thermochromic material printed thereon capable of undergoing a reversible color change upon exposure to heat, associating alpha instructional information with the spot, reproducing the alpha information on a second substrate, and subjecting the second substrate to heat to determine whether the document is original or authentic.

REFERENCES:
patent: 4944450 (1990-07-01), Schmidt
patent: 5193854 (1993-03-01), Borowski, Jr. et al.
patent: 5209513 (1993-05-01), Batelli et al.
patent: 5281570 (1994-01-01), Hasegawa et al.
patent: 5282651 (1994-02-01), Alonso
patent: 5338067 (1994-08-01), Gundjian
patent: 5533759 (1996-07-01), Jeffers
patent: 5536046 (1996-07-01), Chang

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