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US4451521A
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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 fur AUTOMATION und ORGAISATION MBH 8000 MUENCHEN 70 GERMANY
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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 PCT No. PCT/DE81/00081 Sec. 371 Date Oct. 23, 1981 Sec. 102(e) Date Oct. 23, 1981 PCT Filed May 29, 1981 PCT Pub. No. WO81/03510 PCT Pub. Date Dec. 10, 1981.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
2026-11-05 23:07
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: 30
Claim 1
Independent Claim
62 words
Security document with authenticity characteristics comprising: a substrate and a luminescing substance, wherein the luminescing substance is constructed to exhibit, when excited, luminescence emission only in the invisible region of the optical spectrum, said luminescing substance comprising a luminophore combined with an absorbing material having an absorption spectrum which includes a portion of the visible spectrum in which said luminophore emits radiation.
Claim 2
Dependent Claim
62 words
Security document with authenticity characteristics comprising: a substrate and a luminescing substance, wherein the luminescing substance is constructed to exhibit, when excited, luminescence emission only in the invisible region of the optical spectrum, said luminescing substance comprising a luminophore combined with an absorbing material having an absorption spectrum which includes a portion of the visible spectrum in which said luminophore emits radiation.
Claim 3
Dependent Claim
13 words
Security document according to claim 1, wherein the absorbing material is a pigment.
Claim 4
Dependent Claim
13 words
Security document according to claim 2, wherein the absorbing material is a dyestuff.
Claim 5
Dependent Claim
20 words
Security document according to claim 2, wherein the luminescing substance is a mixture of the luminophore and the absorbing material.
Claim 6
Dependent Claim
18 words
Security document according to claim 2, wherein the luminescing substance comprises a luminophore coated with the absorbing material.
Claim 7
Dependent Claim
19 words
Security document according to claim 2, wherein the luminescing substance comprises a luminophore layer coated with the absorbing material.
Claim 8
Dependent Claim
22 words
Security document according to claim 1, wherein the luminophore has a broad band emission spectrum which includes portions of the visible spectrum.
Claim 9
Dependent Claim
13 words
Security document according to claim 7, wherein the luminophore is an organic compound.
Claim 10
Dependent Claim
13 words
Security document according to claim 8, wherein the luminophore is a laser dyestuff.
Claim 11
Dependent Claim
109 words
Security document with authenticity features, comprising: a substrate and a luminescing substance, wherein the luminescing substance is constructed to exhibit, when excited, luminescence emission only in the invisible region of the optical spectrum, said luminescing substance comprising a host matrix doped with a material from the group consisting of the rare earth metals and lanthanides of atomic number 58 to 71, wherein the absorption spectrum of the host matrix includes a portion of the visible spectrum and is such that in the visible region of the optical spectrum it absorbs strongly at least at those wave lengths at which the dopant luminesces and accordingly suppresses the undesired visible luminescences.
Claim 12
Dependent Claim
109 words
Security document with authenticity features, comprising: a substrate and a luminescing substance, wherein the luminescing substance is constructed to exhibit, when excited, luminescence emission only in the invisible region of the optical spectrum, said luminescing substance comprising a host matrix doped with a material from the group consisting of the rare earth metals and lanthanides of atomic number 58 to 71, wherein the absorption spectrum of the host matrix includes a portion of the visible spectrum and is such that in the visible region of the optical spectrum it absorbs strongly at least at those wave lengths at which the dopant luminesces and accordingly suppresses the undesired visible luminescences.
Claim 13
Dependent Claim
29 words
Security document according to claim 10, wherein the host matrix comprises as an element absorbing in the visible spectral region a metal of the sub-groups VI, VII or VIII.
Claim 14
Dependent Claim
19 words
Security document according to claim 10, wherein the dopant has an emission spectrum including portions of the visible spectrum.
Claim 15
Dependent Claim
57 words
Security document according to claim 10, wherein the host matrix has a perovskite structure according to the general formula AXO 3 , wherein A represents a material selected from the group consisting of: bismuth, a rare earth metal, and a combination of bismuth and a rare earth metal, and X represents one or more absorbing transition metals.
Claim 16
Dependent Claim
19 words
Security document according to claim 13, where X is selected from the group consisting of cobalt, nickel, and iron.
Claim 17
Dependent Claim
29 words
Security document according to claim 10, wherein the host matrix has a structure selected from the group consisting of: a garnet structure, a perovskite structure and a ferrite structure.
Claim 18
Dependent Claim
114 words
Security document according to claim 15, wherein the garnet structure can be described by the general formula A.sub.3 X.sub.5-2x M.sub.x M'.sub.x O.sub.12 wherein A represents a material selected from the group consisting of: yttrium, scandium, the lanthanides with the exception of neodymium, praseodymium as well as mixtures thereof with one another as well as with neodymium, praseodymium, lanthanum and bismuth, X represents a metal selected from the group consisting of: iron, aluminum, gallium and indium, M represents a metal selected from the group consisting of: iron, cobalt, nickel, manganese and zinc, M' represents an element selected from the group consisting of: silicon, germanium, tin and zirconium, and the index x has a value 0<x≦2.5.
Claim 19
Dependent Claim
117 words
Security document according to claim 15, wherein the garnet structure is described by the general formula A.sub.3-x X.sub.5-x B.sub.x M.sub.x O.sub.12 wherein A represents a material selected from the group consisting of: yttrium, scandium, the lanthanides with the exception of neodymium, praseodymium as well as mixtures thereof with one another as well as with lanthanum, praseodymium, neodymium and bismuth, B represents an element selected from the group consisting of: magnesium, calcium, strontium, barium, manganese, zinc and cadmium, X represents a metal selected from the group consisting of: iron, aluminum, gallium and indium, M represents an element selected from the group consisting of: silicon, germanium, tin, tellurium, zirconium and titanium and the index x has a value 0<x≦3.
Claim 20
Dependent Claim
81 words
Security document according to claim 15, wherein the garnet structure is described by the general formula A.sub.3 Fe.sub.5-x M.sub.x O.sub.12 wherein A represents a material selected from the group consisting of: yttrium, scandium, the lanthanides with the exception of neodymium, praseodymium, as well as their mixtures with one another as well as with neodymium, praseodymium, lanthanum and bismuth, M represents a metal selected from the group consisting of aluminum, gallium, indium and chromium, and the index x has a value 0≦x<5.
Claim 21
Dependent Claim
97 words
Security document according to claim 15, wherein the garnet structure is described by the general formula A.sub.3-2x B.sub.2x X.sub.5-x V.sub.x O.sub.12 wherein A represents a material selected from the group consisting of: yttrium, scandium, the lanthanides with the exception of neodymium, praseodymium, as well as their mixtures with one another as well as with neodymium, praseodymium, lanthanum and bismuth, B represents an element selected from the group consisting of magnesium, calcium, strontium, and barium, X represents an element selected from the group consisting of aluminum, gallium, indium and iron, and the index x has a value 0≦x<1.5.
Claim 22
Dependent Claim
77 words
Security document according to claim 10, wherein the host matrix has a ferrite structure according to the general formula M.sub.1-x.sup.2+ M'.sub.x.sup.3+ Fe.sub.x.sup.2+ Fe.sub.2-x.sup.3+ O.sub.4 wherein M denotes one or more divalent metals selected from the group consisting of: indium, cadmium, cobalt, manganese, iron, nickel, copper or magnesium, and M' stands for one or more trivalent lanthanides with atomic numbers in the range of 58 to 74, and the index x has a value between 0 and 1.
Claim 23
Dependent Claim
21 words
Security document according to claim 1, wherein the luminescing substance is provided at least partially in large areas of the substrate.
Claim 24
Dependent Claim
16 words
Security document according to claim 1, wherein the luminescing substance is mixed into the substrate composition.
Claim 25
Dependent Claim
17 words
Security document according to claim 1, wherein the luminescing substance is present in the form of strips.
Claim 26
Dependent Claim
22 words
Security document according to claim 1, wherein the luminescing substance is present as an invisible layer at least partially covering the substrate.
Claim 27
Dependent Claim
24 words
Security document according to claim 1, wherein the luminescing substance on excitation with ultraviolet light luminesces in the ultraviolet region of the optical spectrum.
Claim 28
Dependent Claim
24 words
Security document according to claim 1, wherein the luminescing substance on excitation with ultraviolet light luminesces in the infrared region of the optical spectrum.
Claim 29
Dependent Claim
24 words
Security document according to claim 1, wherein the luminescing substance on excitation with infrared light luminesces in the ultraviolet region of the optical spectrum.
Claim 30
Dependent Claim
24 words
Security document according to claim 1, wherein the luminescing substance on excitation with infrared light luminesces in the infrared region of the optical spectrum.
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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 |