EP0400902A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Security paper
Assignee: Portals Ltd
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Filing: 1990-05-24
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Granted: —
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Expires: 2010-05-24
Abstract
Abstract This invention is concerned with security paper (3) for bank notes, cheques and like documents in a security strip of enhanced security which is more difficult to counterfeit than the present bank notes containing window threads. Security papers according to the invention comprise at least one elongated security element (4) which security element is partially embedded within said paper with portions thereof being exposed at the surface of the paper at spaced intervals along the length of the security element at windows in the paper, said security element being visually detectable in transmitted light and being visible in the windows of the paper in reflected light, wherein the said security element comprises a plurality of layers including a support layer (11) and metallic regions (12) such that when the exposed portions of the security element are viewed in reflected light there is visible to the unaided eye in each window at least two metallic areas (1, 2) which form repeating patterns along the length of the element, with the said metallic areas being of different colour.
Inventors
- 👤 David John Edwards
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-09 23:31
CPC Classifications
B; B42; B42D; B42D25/00; B42D25/30; B42D25/355; D; D21; D21H; D21H21/00; D21H21/14; D21H21/40; D21H21/42; B42D25/36; B42D25/373; B42D25/20; B42D25/29; G; G07; G07D; G07D7/00; G07D7/003; B42D2033/10; B42D2033/20; B42D2035/36; B42D25/378; B42D25/382; B42D25/387; Y; Y10; Y10S; Y10S283/00; Y10S283/901; Y10S283/902; Y10S428/00; Y10S428/916; Y10T; Y10T428/00; Y10T428/24; Y10T428/24273; Y10T428/24322; Y10T428/24777; Y10T428/24802; Y10T428/24851; Y10T428/24868; Y10T428/24876; Y10T428/24917; Y10T428/28; Y10T428/29; Y10T428/2913; Y10T428/2933; Y10T428/294; Y10T428/2942; Y10T428/2944; Y10T428/31504; Y10T428/31678; Y10T428/31703
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
137 words
Security paper (3) which comprises at least one elongated security element (4) which security element is partially embedded within said paper with portions thereof being exposed at the surface of the paper at spaced intervals along the length of the security element at windows in the paper, said security element being visually detectable in transmitted light and being visible in the windows of the paper in reflected light, wherein the said security element comprises a plurality of layers including a support layer (11) and metallic regions (12) such that when the exposed portions of the security element are viewed in reflected light there is visible to the unaided eye in each window at least two metallic areas (1,2) which form repeating patterns along the length of the element, with the said metallic areas being of different colour.
Claim 2
Dependent Claim
137 words
Security paper (3) which comprises at least one elongated security element (4) which security element is partially embedded within said paper with portions thereof being exposed at the surface of the paper at spaced intervals along the length of the security element at windows in the paper, said security element being visually detectable in transmitted light and being visible in the windows of the paper in reflected light, wherein the said security element comprises a plurality of layers including a support layer (11) and metallic regions (12) such that when the exposed portions of the security element are viewed in reflected light there is visible to the unaided eye in each window at least two metallic areas (1,2) which form repeating patterns along the length of the element, with the said metallic areas being of different colour.
Claim 3
Dependent Claim
20 words
Paper (3) as claimed in claim 1 wherein the width of the security element (4) is from 1 to 8mm.
Claim 4
Dependent Claim
20 words
Paper (3) as claimed in claim 2 wherein the width of the security element (4) is from 1 to 3mm.
Claim 5
Dependent Claim
74 words
Paper (3) as claimed in any one of the preceding claims wherein the support layer (11) carries on one side spaced apart, selectively metallised areas (12) which form a repeating pattern along the length of the element, and on the other side of the support layer there is a continuous metal layer (14), such that, when viewed from the selectively metallised side of the element, two metallic areas (1,2) of different colour are visible.
Claim 6
Dependent Claim
28 words
Paper (3) as claimed in claim 4 wherein the selectively metallised regions (12) are aluminium and the continuous metallic layer (14) is a metal having a different colour.
Claim 7
Dependent Claim
66 words
Paper (3) as claimed in claim 4 wherein the selectively metallised regions (12) are aluminium and the continuous metallic layer (14) is also aluminium, there being positioned between the two layers of aluminium a transparent layer (11) which is coloured such that the continuous metallic layer, when viewed from the selectively metallised side has the appearance of being a different reflective colour to that of aluminium.
Claim 8
Dependent Claim
55 words
Paper (3) as claimed in any one of the preceding claims wherein the metallic areas (1,2) form a repeating pattern along the length of the element and boundaries (5) are formed between the different coloured metallic areas, of which boundaries of at least one extends to one or both edges of the security element (4).
Claim 9
Dependent Claim
33 words
Paper (3) as claimed in claim 7 wherein all of the boundaries (5) between the metallic areas (1,2) extend from one edge of the element (4) to the other edge across its width.
Claim 10
Dependent Claim
38 words
Paper (3) as claimed in any one of the preceding claims wherein the security element (4) is bonded to the paper by means of an adhesive layer (16) present on either side of the element across its width.
Claim 11
Dependent Claim
35 words
Paper (3) as claimed in any one of the preceding claims wherein the security element (4) is substantially visually symmetrical so that the appearance of the element is the same when viewed from either side.
Claim 12
Dependent Claim
34 words
Paper (3) as claimed in claim 10 wherein the security element (4) is symetrical and is formed by uniting with an adhesive (18) back-to-back two security elements as defined in claims 1 to 8.
Claim 13
Dependent Claim
29 words
Paper (3) as claimed in any one of the preceding claims wherein there is exposed in each window of the paper at least three metallic areas of different colour.
Claim 14
Dependent Claim
43 words
Paper (3) as claimed in any one of the preceding claims which comprises a continuous aluminium layer (14) wherein said layer is capable of reflecting incident light and which also transmits a visually detectable amount of the light which reaches said continuous layer.
Claim 15
Dependent Claim
21 words
Paper (3) as claimed in claim 13 wherein the continuous metal layer (14) has an optical density in the range 0.15-1.0.
Claim 16
Dependent Claim
24 words
Paper (3) as claimed in claim 13 or claim 14 wherein the continuous metal layer (14) has an optical density in the range 0.3-0.7.
Claim 17
Dependent Claim
22 words
Paper (3) as claimed in any one of the preceding claims wherein the length of the windows is from 2 to 8mm.
Claim 18
Dependent Claim
22 words
Paper (3) as claimed in any one of the preceding claims wherein the length of the windows is from 3 to 5mm.
Claim 19
Dependent Claim
40 words
Paper (3) as claimed in any one of the preceding claims which comprises a continuous metallic layer (14) or selectively metallised regions (19) which are provided by metal particles having reflective surfaces which are disposed within a transparent polymeric layer.
Claim 20
Dependent Claim
23 words
A security document, especially a bank note, when produced by printing on paper (3) as claimed in any one of the preceding claims.
References Cited (Backward Citations)
No citation records indexed.
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