US4533244A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for authenticity determination of security documents with security features in the form of luminescing substances
Assignee: GAO Gesellschaft fuer Automation und Organisation mbH
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Filing: 1984-03-07
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Granted: 1985-08-06
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Expires: 2004-03-07
Abstract
Abstract Security paper with narrow band luminescing authenticity characteristics which can only be excited in substantially the same wavelength region in which it also emits. With these authenticity characteristics therefore the authenticity signal is overlapped or covered by the test signal of several orders of magnitude stronger. The authenticity of the security papers cannot accordingly be tested with the normal processes or devices for determining of luminescence. The test devices used take advantage of the decay behavior of the luminescence emission for detection. The authenticity characteristics can be added to the paper material, the printing ink used, further mottling fibres or security threads.
Inventors
- 👤 Wittich Kaule
- 👤 Gerhard Schwenk
- 👤 Gerhard Stenzel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 12:23
CPC Classifications
G; G06; G06K; G06K19/00; G06K19/06; G06K19/08; G06K19/10; G06K19/14; B; B41; B41M; B41M3/00; B41M3/14; B41M3/144; D; D21; D21H; D21H21/00; D21H21/14; D21H21/40; D21H21/44; D21H21/48; G07; G07D; G07D7/00; G07D7/06; G07D7/12; Y; Y10; Y10S; Y10S101/00; Y10S101/46; Y10S428/00; Y10S428/908; Y10S428/916; Y10S428/917; Y10S428/918; Y10T; Y10T428/00; Y10T428/24; Y10T428/24802; Y10T428/24893; Y10T428/24901; Y10T428/25; Y10T428/26; Y10T428/261; Y10T428/29; Y10T428/2982; Y10T428/2991; Y10T428/31504; Y10T428/31551; Y10T428/31634
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
101 words
A process for authenticity determination of a security document, comprising: providing said document with a luminescing substance having a known excitation spectrum and a known emission spectrum wherein at least a portion of said excitation spectrum and a portion of said emission spectrum are contained in a narrow band of wavelengths and at least a portion of said excitation spectrum overlaps at least a portion of said emission spectrum in said narrow wavelength band; exciting said document within said narrow band; and sensing the emissions of said security documents in said narrow band caused by said excitation in said narrow band.
Claim 2
Dependent Claim
101 words
A process for authenticity determination of a security document, comprising: providing said document with a luminescing substance having a known excitation spectrum and a known emission spectrum wherein at least a portion of said excitation spectrum and a portion of said emission spectrum are contained in a narrow band of wavelengths and at least a portion of said excitation spectrum overlaps at least a portion of said emission spectrum in said narrow wavelength band; exciting said document within said narrow band; and sensing the emissions of said security documents in said narrow band caused by said excitation in said narrow band.
Claim 3
Dependent Claim
51 words
A process according to claim 1, wherein said exciting step comprises introducing excitation radiation into an optically more highly refractive layer of said security document, which layer contains said luminescing substance, whereby said excitation radiation is totally reflected within said layer and only luminescence radiation emerging from said layer is observed.
Claim 4
Dependent Claim
14 words
A process according to claim 1, comprising sensing the decay behavior of said emissions.
Claim 5
Dependent Claim
38 words
A process according to claim 3, comprising subjecting said security document to excitation radiation with said document in a first zone, and said step of sensing comprises sensing said decay behavior with said document in a second zone.
Claim 6
Independent Claim
63 words
A device for testing a security document having an authenticity feature in the form of a luminescing substance comprising: a housing; a light source arranged in said housing; at least one photo-detector; and a transport means for transporting a security document from said light source to said at least one photo-detector, within the decay time of the luminescing material of said security document.
Claim 7
Independent Claim
63 words
A device for testing a security document having an authenticity feature in the form of a luminescing substance comprising: a housing; a light source arranged in said housing; at least one photo-detector; and a transport means for transporting a security document from said light source to said at least one photo-detector, within the decay time of the luminescing material of said security document.
Claim 8
Dependent Claim
23 words
A device according to claim 5, wherein said light source provides sufficient radiation to approximately cover the luminescing substance of said security document.
Claim 9
Dependent Claim
20 words
A device according to claim 5, wherein the transport means moves the security document continuously with a constantly defined speed.
Claim 10
Dependent Claim
33 words
A device according to claim 5, wherein the transport means comprises an electromagnetically operated claw which grasps the securty document and transports it from said light source to said at least one photo-detector.
Claim 11
Dependent Claim
29 words
A device according to claim 8, wherein the light source and the transport means are controlled by a positioning switch operated by a front edge of the security paper.
Claim 12
Dependent Claim
16 words
A device according to claim 7, wherein several photo-detectors are arranged sequentially in the transport direction.
Claim 13
Dependent Claim
36 words
A device according to claim 6, wherein said luminescing substance is divided into several coding fields, and including a plurality of photo-detectors, said photo-detectors and light source being arranged correspondingly to test said several coding fields.
Claim 14
Dependent Claim
21 words
A device according to claim 7, including means for operating said light source synchronously with the transport speed and the photo-detectors.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-08-05 | 1989-02-04 | 1989-08-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-08-05 | 1993-02-04 | 1993-08-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-08-05 | 1997-02-04 | 1997-08-06 | $7700.00 | Window Closed / Lapsed |