EP0453131A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Security paper and method of manufacturing same
Assignee: Crown Paper Co
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Filing: 1991-04-04
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Granted: —
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Expires: 2011-04-04
Abstract
Abstract A security paper comprising a first layer of paper having an inner surface and an outer surface, a second layer of paper having an inner surface and an outer surface, and an authentication indicator disposed on an inner surface of at least one of said layers of paper; the inner surfaces of said layers of paper being affixed relative to each other to form a lamination with said authentication indicator being disposed therebetween and said authentication indicator being substantially imperceptible in said security paper in reflected light of visible wavelength. In a preferred embodiment, the security paper includes two layers of paper each having predetermined mechanical properties, color and optical density. Authentication indicia are printed on the inner surface of at least one layer. The indicia are formed of a chemically, mechanically and thermally stable medium. A chemically, mechanically and thermally stable adhesive permanently adheres the inner surfaces of the layers together. The color and optical density of the layers, the color, color intensity and optical density of the medium and the color and optical density of the adhesive are chosen to render the authentication indicia substantially imperceptible in reflected light but detectable in transmitted light.
Inventors
- 👤 Richard W. Detrick
- 👤 Kim W. Robinson
- 👤 Robert Patterson
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-09 05:44
CPC Classifications
B; B42; B42D; B42D25/00; B42D25/40; B42D25/45; B32; B32B; B32B29/00; B32B29/002; B32B29/06; B32B7/00; B32B7/04; B32B7/12; B42D25/20; B42D25/29; B42D25/30; B42D25/333; B42D25/351; B42D25/36; B42D25/369; B42D25/378; B42D25/387; D; D21; D21H; D21H21/00; D21H21/14; D21H21/40; D21H21/42; D21H21/44; B32B2305/00; B32B2305/34; B32B2307/00; B32B2307/40; B32B2307/422; B32B2554/00; B42D2035/36
Claims Analysis
Total Claims: 26
Claim 1
Independent Claim
87 words
A security paper comprising: a first layer of paper having an inner surface and an outer surface; a second layer of paper having an inner surface and an outer surface; and an authentication indicator disposed on an inner surface of at least one of said layers of paper; the inner surfaces of said layers of paper being affixed relative to each other to form a lamination with said authentication indicator being disposed therebetween and said authentication indicator being substantially imperceptible in said security paper in reflected light.
Claim 2
Dependent Claim
31 words
A security paper according to claim 1 in which said authentication indicator is detectable in said security paper by submitting the paper to examination by radiation, other than in reflected light.
Claim 3
Dependent Claim
38 words
A security paper according to claim 2 in which said authentication indicator is detectable in said paper by at least one of the following means, namely in transmitted radiation in the visible spectrum, under non-visible irradiation and magnetically.
Claim 4
Dependent Claim
23 words
A security paper according to claim 1 or claim 2 or claim 3 wherein said authentication indicator is a detectable universal product code.
Claim 5
Dependent Claim
26 words
A security paper as claimed in any one of claims 1 to 4 further including adhesive affixing said inner surfaces of said layers of paper together.
Claim 6
Dependent Claim
22 words
A security paper according to claim 5 wherein the adhesive has greater resistance to chemical, thermal and mechanical degradation than said layers.
Claim 7
Dependent Claim
17 words
A security paper according to claim 5 or claim 6 wherein the adhesive is a thermosetting adhesive.
Claim 8
Dependent Claim
26 words
A security paper according to any one of claims 5 to 7 wherein the adhesive is selected from carboxylated polymers, thermosetting acrylics and N-methylol acrylamide interpolymers.
Claim 9
Dependent Claim
20 words
A security paper according to any one of claims 5 to 8 wherein the adhesive includes a pigment or dye.
Claim 10
Dependent Claim
55 words
A security paper according to any one of claims 1 to 9 wherein the light scattering, absorbtion reflectance and transmission characteristics of the layers, authentication indicator, and adhesive where present, are such that said indicator is detectable in said paper in transmitted light but substantially imperceptible in said paper in reflected light of visible wavelength.
Claim 11
Dependent Claim
62 words
A security paper according to any one of claims 1 to 9 wherein the color and optical characteristics of the layers, and adhesive where present, and the color, color intensity and optical characteristics of the authentication indicator are such that said indicator is detectable in said paper in transmitted light but substantially imperceptible in said paper in reflected light of visible wavelength.
Claim 12
Dependent Claim
19 words
A security paper as claimed in any one of claims 2 to 9 wherein said authentication indicator is fluorescent.
Claim 13
Dependent Claim
17 words
A security paper as claimed in claim 12 when said authentication indicator fluoresces in ultra violet light.
Claim 14
Dependent Claim
26 words
A security paper according to any one of claims 1 to 13 wherein at least one of said layers of paper includes a dye or pigment.
Claim 15
Dependent Claim
32 words
A security paper according to any one of claims 1 to 14 wherein said authentication indicator comprises indicia printed on an inner surface of at least one of said layers of paper.
Claim 16
Dependent Claim
14 words
A security paper according to claim 15 wherein said indicia are printed in ink.
Claim 17
Dependent Claim
47 words
A security paper according to any one of claims 1 to 16 wherein said authentication indicator comprises first authentication indicia printed in a first medium and second authentication indicia printed in a second medium, said indicia being printed on at least one of said layers of paper.
Claim 18
Dependent Claim
42 words
A security paper according to claim 17, wherein first authentication indicia are printed on the inner surface of one layer in a first medium; and second authentication indicia are printed on the inner surface of the other layer in a second medium.
Claim 19
Dependent Claim
22 words
A security paper according to claim 17 or claim 18 wherein said second medium is substantially the same as said first medium.
Claim 20
Dependent Claim
28 words
A security paper according to claim 17, 18 or 19 wherein said second authentication indicia comprise a watermark and the second medium is oil or a chemical treatment.
Claim 21
Dependent Claim
51 words
A security paper according to any one of claims 1 to 20 wherein said authentication indicator includes at least one of the following; namely, a half tone design; a stripe disposed in a predetermined spatial relation to at least one edge of said at least one layer; and optically readable characters.
Claim 22
Dependent Claim
130 words
A security paper is claimed in claim 5 comprising: a lamination of a plurality of layers of paper, each said layer having predetermined mechanical, color and optical characteristics, said lamination including adhesive permanently adhering interior surfaces of said sheets together to form said lamination, said adhesive having predetermined color and optical characteristics and having greater resistance to chemical, thermal and mechanical degradation than said layers; and authentication indicia printed in a chemically, thermally and mechanically stable medium on at least one interior surface of at least one of said layers, said medium having predetermined color and optical characteristics; the color and optical characteristics of said layers, said adhesive and said medium combining to render said authentication indicia detectable in transmitted light but substantially imperceptible in reflected light of visible wavelength.
Claim 23
Independent Claim
81 words
A method of manufacturing composite security paper as claimed in any one of claims 1 to 23 said method comprising the steps of: providing at least two layers of paper each having an inner surface and an outer surface; printing said authentication indicator on said inner surface of at least one of said layers; applying adhesive to at least one of said inner surfaces of said layers; and adhesively joining the respective inner surfaces of said layers to form a lamination.
Claim 24
Dependent Claim
18 words
A method according to claim 23 wherein said printing step uses offset printing, flexographic printing, or rotogravure printing.
Claim 25
Dependent Claim
17 words
The method according to claim 23 or claim 24 wherein adhesive is applied flexographically or by rotogravure.
Claim 26
Dependent Claim
157 words
A document authentication system comprising: a document comprising a lamination of a plurality of layers of paper, each said layer having predetermined mechanical, color and optical characteristics, said lamination including adhesive permanently adhering inner surfaces of said layers together to form said lamination, said adhesive having predetermined color and optical characteristics and having greater resistance to chemical, thermal and mechanical degradation than said layers; and authentication indicia printed in a chemically, thermally and mechanically stable medium on at least one interior surface of at least one sheet, said medium having predetermined color and optical characteristics; the color and optical characteristics of said sheets, said adhesive and said medium combining to render said authentication indicia detectable in transmitted light of a predetermined wavelength and substantially imperceptible in reflected light of visible wavelength; a source of light of said predetermined wavelength; and means permitting selective placement of said document in position to transmit therethrough said light of predetermined wavelength.
References Cited (Backward Citations)
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