US4451530A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Security paper with authenticity 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: 1984-05-29
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Expires: 2001-05-29
Abstract
Abstract Security papers with luminescing authenticity features worked into them or printed on them. The authenticity features used consist of a luminophore and one or more absorbing materials by which the emission and/or the excitation spectrum of the luminophore is changed in detectable fashion. The dyestuff can be present as an admixture to the luminophore, as a coating of a luminophore layer or as a coating on luminophore powder grains. For checking the authenticity of documents the emission spectrum of the luminophore is not used but the change generated by the technology used in the emission or excitation spectra.
Inventors
- 👤 Wittich Kaule
- 👤 Gerhard Schwenk
- 👤 Gerhard Stenzel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 20:34
CPC Classifications
G; G07; G07D; G07D7/00; G07D7/06; G07D7/12; G07D7/121; B; B41; B41M; B41M3/00; B41M3/14; B41M3/144; D; D21; D21H; D21H21/00; D21H21/14; D21H21/40; D21H21/44; D21H21/48; G06; G06K; G06K19/00; G06K19/06; G06K19/08; G06K19/10; G06K19/14; G07D7/1205; Y; Y10; Y10S; Y10S101/00; Y10S101/46; Y10S428/00; Y10S428/908; Y10S428/913; Y10S428/916; 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; Y10T428/31678; Y10T428/31703; Y10T428/31971; Y10T428/31993; Y10T428/31996
Claims Analysis
Total Claims: 23
Claim 1
Independent Claim
92 words
Security document with authenticity features comprising: a substrate material supporting a luminescing substance, having a known emission spectrum and a known excitation spectrum, said luminescing substance comprising a luminophore and an absorbing substance, said absorbing substance having an absorption spectrum which partly overlaps at least one of said known emission spectrum and said known excitation spectrum of the luminophore whereby said luminescing substance has an emission spectrum which is characteristically altered from said known emission spectrum whereby said characteristically altered portion of the spectrum is used for authentication of the security document.
Claim 2
Dependent Claim
92 words
Security document with authenticity features comprising: a substrate material supporting a luminescing substance, having a known emission spectrum and a known excitation spectrum, said luminescing substance comprising a luminophore and an absorbing substance, said absorbing substance having an absorption spectrum which partly overlaps at least one of said known emission spectrum and said known excitation spectrum of the luminophore whereby said luminescing substance has an emission spectrum which is characteristically altered from said known emission spectrum whereby said characteristically altered portion of the spectrum is used for authentication of the security document.
Claim 3
Dependent Claim
13 words
Security document according to claim 1, wherein said absorbing material is a dyestuff.
Claim 4
Dependent Claim
13 words
Security document according to claim 1, wherein said absorbing material is a pigment.
Claim 5
Dependent Claim
13 words
Security document according to claim 1, wherein said absorbing material is an IR-absorber.
Claim 6
Dependent Claim
13 words
Security document according to claim 1, wherein said absorbing material is a UV-absorber.
Claim 7
Dependent Claim
33 words
Security document according to claim 5, wherein said absorbing material is a mixture containing at least two materials selected from the group consisting of a dyestuff, a pigment, an IR-absorber and a UV-absorber.
Claim 8
Dependent Claim
42 words
Security document according to claim 1, wherein said luminophore has an emission spectrum which includes a portion of the visible spectrum and said absorbing material has an absorbing spectrum which includes said portion of the visible spectrum in which said luminophore emits.
Claim 9
Dependent Claim
25 words
Security document according to claim 1, wherein said absorbing material has an absorption spectrum which includes the whole visible spectral region and the rear IR.
Claim 10
Dependent Claim
37 words
Security document according to claim 1, wherein said luminophore has a known emission spectrum and said absorbing material is optically translucent in each spectral region of said emission spectrum with the exception of the visible spectral region.
Claim 11
Dependent Claim
19 words
Security document according to claim 1, wherein said luminophore emission spectrum includes the invisible region of the optical spectrum.
Claim 12
Dependent Claim
19 words
Security document according to claim 10, wherein said luminophore emission spectrum includes the infrared region of the optical spectrum.
Claim 13
Dependent Claim
22 words
Security document according to claim 1, wherein said luminophore has an excitation spectrum which includes the non-visible region of the optical spectrum.
Claim 14
Dependent Claim
15 words
Security document according to claim 10, wherein said luminophore has a broad band emission spectrum.
Claim 15
Dependent Claim
13 words
Security document according to claim 13, wherein the luminophore is a laser dyestuff.
Claim 16
Dependent Claim
15 words
Security document according to claim 10, wherein the luminophore has a narrow band emission spectrum.
Claim 17
Dependent Claim
15 words
Security document according to claim 15, wherein the luminophore is a rare earth metal luminophore.
Claim 18
Dependent Claim
20 words
Security document according to claim 1, wherein the luminescing substance is a mixture of the luminophore and the absorbing material.
Claim 19
Dependent Claim
18 words
Security document according to claim 1, wherein the luminescing substance comprises a luminophore coated with the absorbing material.
Claim 20
Dependent Claim
19 words
Security document according to claim 1, wherein the luminescing substance comprises a luminophore layer coated with the absorbing material.
Claim 21
Dependent Claim
41 words
Security document according to claim 1, wherein the absorbing material has an absorption spectrum which overlaps an edge of one of said excitation and emisson spectrums of the luminophore to damp emissions from said luminophore small values in the overlapped region.
Claim 22
Dependent Claim
30 words
Security document according to claim 1, wherein the absorbing material has an absorption spectrum which covers a narrow region of one of said excitation and emission spectrums of the luminophore.
Claim 23
Dependent Claim
30 words
Security document according to claim 21, wherein the absorbing material has an absorption spectrum which covers lines of at least one of the excitation and emission spectrums of said luminophore.
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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) | 1987-05-29 | 1987-11-28 | 1988-05-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-05-29 | 1991-11-28 | 1992-05-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-05-29 | 1995-11-28 | 1996-05-29 | $7700.00 | Window Closed / Lapsed |