Title: Security filament as protection against fraud

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.

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Inventors: Von, Kempski Walter (Leverkusen, DE)
Kirstein, Fritz (Cologne, DE)

Application Number: 06/248471
Filing Date: 1981-03-27
Publication_date: 1983-02-01
Assignee: AGFA GEVAERT AG (DE)

Primary Class(es): 283/72 283/57, 428/916
Other Classes: B41M3/14; B42D15/00; B44F1/12; D21H21/42; G06K19/10; G07D7/12; D21H21/40; G07D7/00; B42D15/00
US Patent Ref:

3533176	October, 1970	Weitzberg et al.	40/22	IDENTIFICATION DOCUMENT AND MATERIAL FOR ITS MANUFACTURE
4183989	January, 1980	Tooth	428/916	Security papers
4186943	February, 1980	Lee	283/9R	Security devices
4290630	September, 1981	Lee	283/8R	Security devices

Other Refs: GB1507288GB2015429

April, 1978
September, 1979

Primary Examiner: Ball, Michael W.
Assistant Examiner:
Attorney: Connolly, And Hutz

Claims:

We claim