Security document having a security thread embedded therein and

Details Security document having a security thread embedded therein and Security document having a security thread embedded therein and

1985-12-23

1988-07-12

Bell, Paul A.

Printed matter

Having revealable concealed information, fraud preventer or...

Utilizing electromagnetic radiation

283904, 428915, B42D 1500

Patent

active

047565578

ABSTRACT:
In order to increase the protection of security documents such as ban notes, etc., against forgery, security threads are embedded in the document which have at least two areas extending in the longitudinal direction of the thread and differing in their physical properties. The thread is preferably a coextruded multicomponent synthetic thread whose individual components contain additives such as dyes or fluorescent substances and/or particles having electrical or magnetic properties. The testing of the authenticity of the security thread is directed toward the presence of these additives and their mutual geometrical distribution in certain areas of the security thread.

REFERENCES:
patent: 2143406 (1939-01-01), Chamberlain
patent: 3728521 (1973-04-01), Borough et al.
patent: 3880706 (1975-04-01), Williams
patent: 4183989 (1980-01-01), Tooth
patent: 4265703 (1981-05-01), Terliska
patent: 4371196 (1983-02-01), von Kempski et al.
patent: 4524276 (1985-06-01), Ohtombe
patent: 4618167 (1986-10-01), Whitehead
European Search Report.
"Synthesefasern", Bela von Kalfai, Verlag Chemie 1982, pp. 124-129.

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