US4371196A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Security filament as protection against fraud
Assignee: Agfa Gevaert AG
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Filing: 1981-03-27
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Granted: 1983-02-01
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Expires: 2001-03-27
Abstract
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.
Inventors
- 👤 Walter von Kempski
- 👤 Fritz Kirstein
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 00:53
CPC Classifications
B; B42; B42D; B42D25/00; B42D25/30; B42D25/355; B41; B41M; B41M3/00; B41M3/14; B42D25/20; B42D25/23; B42D25/24; B42D25/29; B42D25/36; B42D25/373; B42D25/40; B42D25/45; B42D25/465; B42D25/47; D; D21; D21H; D21H21/00; D21H21/14; D21H21/40; D21H21/42; G; G06; G06K; G06K19/00; G06K19/06; G06K19/08; G06K19/10; G07; G07D; G07D7/00; G07D7/06; G07D7/12; B42D2033/00; B42D2033/04; B42D2033/10; B42D2033/32; B42D2035/02; B42D2035/06; B42D2035/08; B42D2035/16; B42D25/309; Y; Y10; Y10S; Y10S428/00; Y10S428/916
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
54 words
In combination, a thread having longitudinal grooved and raised portion surface formations, formed into the circumference of the longitudinal thread and providing a visibly identifiable cross-section in said thread, said surface formations extending longitudinally of said thread along a substantial part of its length, and a card carrying said thread in a visible position.
Claim 2
Dependent Claim
54 words
In combination, a thread having longitudinal grooved and raised portion surface formations, formed into the circumference of the longitudinal thread and providing a visibly identifiable cross-section in said thread, said surface formations extending longitudinally of said thread along a substantial part of its length, and a card carrying said thread in a visible position.
Claim 3
Dependent Claim
19 words
The combination of claim 1 characterised in that the thread is produced from a metal or a metal alloy.
Claim 4
Dependent Claim
16 words
The combination of claim 1 characterised in that the thread is made of glass or plastics.
Claim 5
Dependent Claim
15 words
The combination as claimed in claim 1, wherein the thread is bonded to said card.
Claim 6
Dependent Claim
21 words
The combination as claimed in claim 4, having a covering film covering the thread, said thread being visible through the film.
Claim 7
Dependent Claim
25 words
The combination of claim 5 characterised in that at least one thread is bonded permanently to a document and is protected by a lacquer layer.
Claim 8
Dependent Claim
21 words
The combination as claimed in claim 1, wherein the surface formations are produced by drawing the thread through a calibrating device.
Claim 9
Dependent Claim
19 words
The combination as claimed in claim 1, wherein additional radial surface formations are longitudinally spaced apart on said thread.
References Cited (Backward Citations)
US3533176A
Cited
GB1507288A
Cited
US4186943A
Cited
US4183989A
Cited
US4183989B1
Cited
US4290630A
Cited
GB2015429B
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-01-31 | 1986-08-02 | 1987-02-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-01-31 | 1990-08-02 | 1991-02-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-01-31 | 1994-08-02 | 1995-02-01 | $7700.00 | Window Closed / Lapsed |