Security threads

Details Security threads Security threads

1994-01-19

1995-11-07

Cangialosi, Salvatore

Cryptography

By modifying optical image

380 59, 283 72, 283 85, H04L 900, B42D 1500

Patent

active

054653010

ABSTRACT:
A security thread (11) for use in security articles (10), includes a substrate having a coating on one or both sides thereof, the coating containing a thermochromic material selected from pigments and dyestuffs which changes from coloured to colourless when the temperature of the pigment or dyestuff is changed to the activation temperature. The thermochromic material may be coloured when the temperature is below the activation temperature and become colourless when the material is at the activation temperature or above. The thread (11) is for security paper (10) for use in producing banknotes and the like.

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patent: 4425161 (1984-01-01), Shibahashi et al.
patent: 4451521 (1984-03-01), Kaule et al.
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patent: 5093184 (1992-05-01), Edwards
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patent: 5260582 (1993-11-01), Danek et al.
patent: 5308992 (1994-05-01), Crame et al.
patent: 5324567 (1994-06-01), Bratchley et al.
patent: 5413839 (1995-05-01), Chatwin et al.

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