Patent US4040774A successfully refreshed from Google Patents.
Patent US4598205A successfully refreshed from Google Patents.
US4598205A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Security paper with authenticity features in the form of substances luminescing only in the invisible region of the optical spectrum and process for testing the same
Assignee: GAO Gesellschaft fuer Automation und Organisation mbH
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Filing: 1984-03-07
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Granted: 1986-07-01
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Expires: 2004-03-07
Abstract
Abstract Security paper with luminescing authenticity characteristics which after excitation with invisible light emit exclusively invisible light of different wavelengths as authenticity signal. The luminophores can be included in the printing ink used or they can be added to the paper material in the manufacture of the paper material. A corresponding test apparatus makes it possible to check the authenticity of the security paper in the presence of customers but unnoticed by them; thereby the invisibility of the test signal and the authenticity signal are taken advantage of and the test device is hidden behind a plate non-transmissive for visible light which however is transmissive for the test signal and for the authenticity signal.
Inventors
- 👤 Wittich Kaule
- 👤 Gerhard Stenzel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 13:11
CPC Classifications
C; C09; C09K; C09K11/00; C09K11/08; C09K11/77; C09K11/7766; C09K11/7767; C09K11/7769; B; B41; B41M; B41M3/00; B41M3/14; B41M3/144; B42; B42D; B42D25/00; B42D25/30; B42D25/36; B42D25/378; B42D25/382; B42D25/387; C09K11/7776; D; D21; D21H; D21H21/00; D21H21/14; D21H21/40; D21H21/44; D21H21/48; G; G06; G06K; G06K19/00; G06K19/06; G06K19/08; G06K19/10; G06K19/14; G07; G07D; G07D7/00; G07D7/06; G07D7/12; Y; Y10; Y10S; Y10S101/00; Y10S101/46; Y10S428/00; Y10S428/90; Y10S428/908; Y10S428/913; Y10T; Y10T428/00; Y10T428/24; Y10T428/24802; Y10T428/24835; Y10T428/24851; Y10T428/24868; Y10T428/24876; Y10T428/24893; Y10T428/24901; Y10T428/25; Y10T428/26; Y10T428/261; Y10T428/29; Y10T428/2982; Y10T428/2991; Y10T428/31504; Y10T428/31551; Y10T428/31634; Y10T428/31678; Y10T428/31703; Y10T428/31971; Y10T428/31993; Y10T428/31996
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
135 words
A process for testing the authenticity of security documents secured with a luminescing substance without attracting attention, comprising: exciting the security document with light from the invisible region of the optical spectrum; and sensing luminescence light emitted from said security document in the invisible region of the optical spectrum; wherein the exciting and sensing steps are performed through a plate which is separate from said security document and opaque to visible light but which allows both excitation light and also luminescence light to pass through; and wherein said exciting step is carried out by an exposure unit and said sensing step is carried out by a sensing unit and further including positioning said exposure unit and said sensing unit behind said plate so as to hide said exposure unit and said sensing unit from view.
Claim 2
Dependent Claim
135 words
A process for testing the authenticity of security documents secured with a luminescing substance without attracting attention, comprising: exciting the security document with light from the invisible region of the optical spectrum; and sensing luminescence light emitted from said security document in the invisible region of the optical spectrum; wherein the exciting and sensing steps are performed through a plate which is separate from said security document and opaque to visible light but which allows both excitation light and also luminescence light to pass through; and wherein said exciting step is carried out by an exposure unit and said sensing step is carried out by a sensing unit and further including positioning said exposure unit and said sensing unit behind said plate so as to hide said exposure unit and said sensing unit from view.
Claim 3
Dependent Claim
35 words
A process according to claim 1, wherein the exciting step comprises using UV-light for excitation of the luminescing substance and the sensing step comprises evaluating only light from the ultraviolet region of the optical spectrum.
Claim 4
Dependent Claim
35 words
A process according to claim 1, wherein the excitation step comprises using UV-light for excitation of the luminescing substance and the sensing step comprises evaluating only light in the infrared region of the optical spectrum.
Claim 5
Dependent Claim
35 words
A process according to claim 1, wherein the excitation step comprises using IR-light for excitation of the luminescing substance and the sensing step comprises evaluating only light in the ultraviolet region of the optical spectrum.
Claim 6
Dependent Claim
35 words
A process according to claim 1, wherein the excitation step comprises using IR-light for excitation of the luminescing substance and the sensing step comprises evaluating only light in the infrared region of the optical spectrum.
Claim 7
Independent Claim
96 words
A device for testing the authenticity of security documents secured with a luminescing substance without attracting attention, comprising: an exposure unit for exciting the security document with light from the invisible region of the optical spectrum; a detector unit for sensing luminescence light emitted from the security paper in the invisible region of the optical spectrum; and a plate separating said exposure unit and said detector from a security document being tested, said plate being separate from said security document, opaque to visible light and allowing both excitation light and also luminescence light to pass through.
Claim 8
Independent Claim
96 words
A device for testing the authenticity of security documents secured with a luminescing substance without attracting attention, comprising: an exposure unit for exciting the security document with light from the invisible region of the optical spectrum; a detector unit for sensing luminescence light emitted from the security paper in the invisible region of the optical spectrum; and a plate separating said exposure unit and said detector from a security document being tested, said plate being separate from said security document, opaque to visible light and allowing both excitation light and also luminescence light to pass through.
Claim 9
Dependent Claim
16 words
A device according to claim 1, wherein said plate reflects little visible light and appears black.
Claim 10
Dependent Claim
13 words
A device according to claim 7, wherein said plate comprises a Woods glass.
Claim 11
Dependent Claim
27 words
A device according to claim 7, wherein said plate comprises a tempering glass, the absorption edge of which lies outside the visible region of the optical spectrum.
Claim 12
Dependent Claim
12 words
A device according to claim 7, wherein said plate comprises dichroic material.
Claim 13
Dependent Claim
23 words
A device according to claim 7, wherein said plate comprises a plastic foil or plastic plate which contains suitable absorbing material as filler.
Claim 14
Dependent Claim
20 words
A device according to claim 6 wherein said plate strongly reflects visible light particularly specular and appears as a mirror.
Claim 15
Dependent Claim
14 words
A device according to claim 12, wherein said plate appears as a colored mirror.
Claim 16
Dependent Claim
17 words
A device according to claim 12, wherein said plate comprises semi-conductor material such as silicon or germanium.
Claim 17
Dependent Claim
14 words
A device according to claim 12, wherein said plate comprise a cold light mirror.
Claim 18
Dependent Claim
13 words
A device according to claim 12, wherein said plate comprises an interference filter.
Claim 19
Dependent Claim
22 words
A device according to claim 6 wherein said plate is positioned to hide said exposure unit and said detector unit from view.
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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) | 1989-06-30 | 1989-12-30 | 1990-07-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-06-30 | 1993-12-30 | 1994-07-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-06-30 | 1997-12-30 | 1998-07-01 | $7700.00 | Window Closed / Lapsed |