US4756557A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Security document having a security thread embedded therein and methods for producing and testing the authenticity of the security document
Assignee: GAO Gesellschaft fuer Automation und Organisation mbH
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Filing: 1985-12-23
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Granted: 1988-07-12
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Expires: 2005-12-23
Abstract
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.
Inventors
- 👤 Wittich Kaule
- 👤 Gerhard Stenzel
- 👤 Jurgen Moll
- 👤 Gerhard Schwenk
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 02:47
CPC Classifications
D; D21; D21H; D21H21/00; D21H21/14; D21H21/40; D21H21/44; D21H21/48; B; B42; B42D; B42D25/00; B42D25/30; B42D25/355; G; G06; G06K; G06K19/00; G06K19/06; G06K19/08; G06K19/10; G07; G07D; G07D7/00; G07D7/04; G07D7/06; G07D7/12; G07D7/121; Y; Y10; Y10S; Y10S283/00; Y10S283/904; Y10S428/00; Y10S428/914; Y10S428/915
Claims Analysis
Total Claims: 29
Claim 1
Independent Claim
78 words
A security document comprising at least one elongated security thread said security thread being at least partially embedded within said document, said thread being visually detectable in incident and/or transmitted light said security thread further comprising a plurality of areas extending homogeneously along the entire length of the thread, said areas differing in terms of their detectable physical properties and being arranged so that said detectable physical properties can be visually detected from a surface of said document.
Claim 2
Dependent Claim
78 words
A security document comprising at least one elongated security thread said security thread being at least partially embedded within said document, said thread being visually detectable in incident and/or transmitted light said security thread further comprising a plurality of areas extending homogeneously along the entire length of the thread, said areas differing in terms of their detectable physical properties and being arranged so that said detectable physical properties can be visually detected from a surface of said document.
Claim 3
Dependent Claim
15 words
The security document as in claim 1, wherein said areas have different spectral remitting/transmitting properties.
Claim 4
Dependent Claim
50 words
The security document as in claim 2, wherein said security thread further comprises three areas extending continuously in the longitudinal direction of said thread; wherein said areas are arranged as a center area and outer areas, said outer areas having at least one physical property differing from said center area.
Claim 5
Dependent Claim
16 words
The security document as in claim 3, wherein said outer areas have the same physical property.
Claim 6
Dependent Claim
14 words
The security document as in claim 1, wherein said areas have different fluorescence properties.
Claim 7
Dependent Claim
50 words
The security document as in claim 5, wherein said security thread further comprises three areas extending continuously in the longitudinal direction of said thread; wherein said areas are arranged as a center area and outer areas, said outer areas having at least one physical property differing from said center area.
Claim 8
Dependent Claim
16 words
The security document as in claim 6, wherein said outer areas have the same physical property.
Claim 9
Dependent Claim
36 words
The security document as in claim 4 wherein said areas are adjacent and comprise fluorescent substances such that emitted light of fluorescent substance of one area excites the fluorescent substance of an adjacent area to emit.
Claim 10
Dependent Claim
50 words
The security document as in claim 8, wherein said security thread further comprises three areas extending continuously in the longitudinal direction of said thread; wherein said areas are arranged as a center area and outer areas, said outer areas having at least one physical property differing from said center area.
Claim 11
Dependent Claim
16 words
The security document as in claim 9, wherein said outer areas have the same physical property.
Claim 12
Dependent Claim
17 words
The security document as in claim 1, wherein said areas further comprises different magnetic and/or electric properties.
Claim 13
Dependent Claim
50 words
The security document as in claim 11 wherein said security thread further comprises three areas extending continuously in the longitudinal direction of said thread; wherein said areas are arranged as a center area and outer areas, said outer areas having at least one physical property differing from said center area.
Claim 14
Dependent Claim
16 words
The security document as in claim 12, wherein said outer areas have the same physical property.
Claim 15
Dependent Claim
22 words
The security document as in claim 1, wherein said areas differ visibly and exhibit differing physical properties which are not detectable visually.
Claim 16
Dependent Claim
50 words
The security document as in claim 14, wherein said security thread further comprises three areas extending continuously in the longitudinal direction of said thread; wherein said areas are arranged as a center area and outer areas, said outer areas having at least one physical property differing from said center area.
Claim 17
Dependent Claim
16 words
The security document as in claim 15, wherein said outer areas have the same physical property.
Claim 18
Dependent Claim
21 words
The security document as in claim 1, wherein said security thread is a multicomponent synthetic thread manufactured using a coextrusion technique.
Claim 19
Dependent Claim
35 words
The security document as in claim 17, wherein individual components of the multicomponent synthetic thread are made of a polymer or polymer mixture either of which is provided with different additives conveying specific physical properties.
Claim 20
Dependent Claim
20 words
The security document as in claim 1, wherein said security thread further comprises a plurality of firmly interconnected single threads.
Claim 21
Dependent Claim
15 words
The security document as in claim 19, wherein said single threads are extruded synthetic threads.
Claim 22
Dependent Claim
35 words
The security document as in claim 19, wherein individual components of the multicomponent synthetic thread are made of a polymer or polymer mixture either of which is provided with different additives conveying specific physical properties.
Claim 23
Dependent Claim
20 words
The security document as in claim 1, wherein said security thread lies partly on a surface of said security document.
Claim 24
Dependent Claim
22 words
The security document as in claim 1, wherein said security thread is embedded in said security document under a transparent cover film.
Claim 25
Dependent Claim
50 words
The security document as in claim 1, wherein said security thread further comprises three areas extending continuously in the longitudinal direction of said thread; wherein said areas are arranged as a center area and outer areas, said outer areas having at least one physical property differing from said center area.
Claim 26
Dependent Claim
16 words
The security document as in claim 24, wherein said outer areas have the same physical property.
Claim 27
Dependent Claim
29 words
The security document as in claim 1, wherein the security thread is introduced into the document in such a way as to be directly visible at least in part.
Claim 28
Dependent Claim
20 words
The security document as in claim 26, wherein said security thread lies partly on a surface of the security document.
Claim 29
Dependent Claim
22 words
The security document as in claim 26, wherein said security thread is embedded in the security document under a transparent cover film.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-07-12 | 1992-01-11 | 1992-07-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-07-12 | 1996-01-11 | 1996-07-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-07-12 | 2000-01-11 | 2000-07-12 | $7700.00 | Window Closed / Lapsed |