US4442170A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Security document with security features in the form of luminescing substances
Assignee: GAO Gesellschaft fuer Automation und Organisation mbH
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Filing: 1981-05-29
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Granted: 1984-04-10
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Expires: 2001-05-29
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
2026-10-25 08:30
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: 17
Claim 1
Independent Claim
89 words
Security document with security features comprising: a substrate material; and a luminescing substance combined with said carrier material, said luminescing substance having a known excitation spectrum and a known emission spectrum wherein at least a portion of said excitation spectrum and at least 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 whereby said luminescing substance operates in a quasi-resonant mode.
Claim 2
Dependent Claim
89 words
Security document with security features comprising: a substrate material; and a luminescing substance combined with said carrier material, said luminescing substance having a known excitation spectrum and a known emission spectrum wherein at least a portion of said excitation spectrum and at least 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 whereby said luminescing substance operates in a quasi-resonant mode.
Claim 3
Dependent Claim
36 words
Security document according to claim 1 wherein said luminescing material includes a masking substance which has an absorption spectrum including portions of the excitation and emission spectrums which lie outside of said narrow band of wavelengths.
Claim 4
Dependent Claim
19 words
Security document according to claim 1 or 2 wherein said narrow wavelength band has a width of 100 nm.
Claim 5
Dependent Claim
29 words
Security document according to claim 2 wherein said masking substance is a material selected from the group consisting of dyestuffs, colored pigments, infrared absorbers, ultraviolet absorbers, and mixtures thereof.
Claim 6
Dependent Claim
16 words
Security document according to claim 2 wherein the luminescence materials are mixed with the masking materials.
Claim 7
Dependent Claim
16 words
Security document according to claim 2 wherein the luminescence materials are coated with the masking substances.
Claim 8
Dependent Claim
16 words
Security document according to claim 2 wherein the luminescence materials are overprinted with the masking materials.
Claim 9
Dependent Claim
15 words
Security document according to claim 1 wherein the luminescing substance comprises printing on said substrate.
Claim 10
Dependent Claim
19 words
Security document according to claim 1 wherein the luminescing substrate is distributed throughout the volume of said substrate material.
Claim 11
Dependent Claim
39 words
Security document according to claim 1 including an optically transparent layer connected to said substrate material, said optically transparent layer being optically more highly refractive than its surroundings, wherein said luminescing substance is inlaid in said optically transparent layer.
Claim 12
Dependent Claim
20 words
Security document according to claim 10 wherein the optically transparent, more highly refractive layer comprises at least one glass fiber.
Claim 13
Dependent Claim
20 words
Security document according to claim 10 wherein the optically transparent, more highly refractive layer comprises at least one plastic fiber.
Claim 14
Dependent Claim
20 words
Security document according to claim 10 wherein the optically transparent, more highly refractive layer comprises at least one plastic foil.
Claim 15
Dependent Claim
16 words
Security document according to claim 1 wherein said narrow wavelength has a width of 50 nm.
Claim 16
Dependent Claim
17 words
Security document according to claim 1 wherein said narrow wavelength band is identical with said overlapping portion.
Claim 17
Dependent Claim
15 words
Security document according to claim 1 wherein said narrow wavelength band frames said overlapping portion.
References Cited (Backward Citations)
DE449133C
Cited
DE497037C
Cited
US2704634A
Cited
US3208009A
Cited
US3473027A
Cited
GB1186253A
Cited
DE1524711A1
Cited
US3412245A
Cited
US3480877A
Cited
US3455577A
Cited
US3533176A
Cited
US3525698A
Cited
DE1599011A1
Cited
DE2102120A1
Cited
US3654463A
Cited
GB1326665A
Cited
DE2318716A1
Cited
US3928226A
Cited
GB1484471A
Cited
DE2547768A1
Cited
US4047033A
Cited
US4202491A
Cited
DE2745301A1
Cited
US4152483A
Cited
DE2754369A1
Cited
DE2903073A1
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-04-10 | 1987-10-10 | 1988-04-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-04-10 | 1991-10-10 | 1992-04-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-04-10 | 1995-10-10 | 1996-04-10 | $7700.00 | Window Closed / Lapsed |