Security filament as protection against fraud

Details Security filament as protection against fraud Security filament as protection against fraud

1981-03-27

1983-02-01

Ball, Michael W.

Printed matter

Calendar

283 8R, 283 57, 428916, B42D 1500

Patent

active

043711960

ABSTRACT:
The invention relates to a security filament to protect against forgery of bank notes, securities, permit cards, identity cards and passports, whereby the safety thread has a cross-sectional shape by which it can be identified optically and is provided with structural features on its surface which extend invariably over the length of the thread.

REFERENCES:
patent: 3533176 (1970-10-01), Weitzberg et al.
patent: 4183989 (1980-01-01), Tooth
patent: 4186943 (1980-02-01), Lee
patent: 4290630 (1981-09-01), Lee

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