EP0279880A1
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Security paper for currency and banknotes
Assignee: Crane and Co Inc
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Filing: 1987-02-24
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Granted: —
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Expires: 2007-02-24
Abstract
Abstract Security devices in the form of metallized plastic films (11, 13) are incorporated within a security paper such as banknotes (10) and other valuable documents during the papermaking process for viewing solely by means of transmitted light. The devices (11, 13) comprise printing (12) of extreme fine line clarity and high opacity such that legibility is possible by means of transmitted light while remaining completely indiscernible under reflected light.
Inventors
- 👤 Timothy T. Crane
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-09 05:46
CPC Classifications
B; B41; B41M; B41M3/00; B41M3/14; B42; B42D; B42D25/00; B42D25/20; B42D25/29; B42D25/30; B42D25/351; B42D25/355; B42D25/36; B42D25/373; D; D21; D21H; D21H21/00; D21H21/14; D21H21/40; D21H21/44; G; G07; G07D; G07D7/00; G07D7/02; G07D7/026; G07D7/06; G07D7/12; Y; Y10; Y10S; Y10S283/00; Y10S283/901; Y10S428/00; Y10S428/916
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
98 words
Security paper comprising: a rectangular sheet of paper having first and second opposing planar surfaces defining a paper thickness and a paper length; first printed indicia legible on both said surfaces under reflective illumination for identifying the subject of said paper; and second printed indicia intermediate said first and second surfaces at a predetermined location along said paper length for providing authenticity to said paper, said second printed indicia being undetectable to the unaided eye under reflective illumination while becoming legible in transmitted illumination through both said surfaces and said paper thickness being uniform along said paper length.
Claim 2
Dependent Claim
98 words
Security paper comprising: a rectangular sheet of paper having first and second opposing planar surfaces defining a paper thickness and a paper length; first printed indicia legible on both said surfaces under reflective illumination for identifying the subject of said paper; and second printed indicia intermediate said first and second surfaces at a predetermined location along said paper length for providing authenticity to said paper, said second printed indicia being undetectable to the unaided eye under reflective illumination while becoming legible in transmitted illumination through both said surfaces and said paper thickness being uniform along said paper length.
Claim 3
Dependent Claim
18 words
The security paper of claim 1, wherein said second printed indicia comprises metal characters on a plastic strip.
Claim 4
Dependent Claim
14 words
The security paper of claim 1, wherein said second printed indicia comprises numeric characters.
Claim 5
Dependent Claim
14 words
The security paper of claim 1, wherein said second printed indicia comprises alphanumeric characters.
Claim 6
Dependent Claim
39 words
The security paper of claims 1 to 4, wherein said sheet of paper further comprises a pair of first and a pair of second opposing sides, said first sides being longer than said second sides to define a rectangle.
Claim 7
Dependent Claim
24 words
The security paper of claim 2, wherein said plastic strip extends between said first sides and across said second sides at said predetermined location.
Claim 8
Dependent Claim
18 words
The security paper of claim 6, wherein said plastic strip extends a predetermined distance from a center line.
Claim 9
Independent Claim
131 words
A method of forming a security paper comprising the steps of: providing a continuous plastic film having metal indicia on at least one surface; inserting said metallized plastic film within a paper fiber slurry at a predetermined location in a papermaking machine during dewatering of said fiber slurry before said fiber is consolidated into a continuous paper web; consolidating said piper fiber into a continuous paper web having said metallized plastic film contained within said paper web; and heating and pressing said paper web and said metallized plastic film to form a finished paper having said metallized plastic film intermediate first and second opposing surfaces, said metal indicia being undetectable to the unaided eye under reflective illumination and becoming legible in transmitted illumination through both said surfaces at said predetermined location.
Claim 10
Independent Claim
131 words
A method of forming a security paper comprising the steps of: providing a continuous plastic film having metal indicia on at least one surface; inserting said metallized plastic film within a paper fiber slurry at a predetermined location in a papermaking machine during dewatering of said fiber slurry before said fiber is consolidated into a continuous paper web; consolidating said piper fiber into a continuous paper web having said metallized plastic film contained within said paper web; and heating and pressing said paper web and said metallized plastic film to form a finished paper having said metallized plastic film intermediate first and second opposing surfaces, said metal indicia being undetectable to the unaided eye under reflective illumination and becoming legible in transmitted illumination through both said surfaces at said predetermined location.
Claim 11
Dependent Claim
15 words
The method of claim 8, wherein said plastic comprises polyester and said metal comprises aluminum.
Claim 12
Dependent Claim
55 words
The method of claim 8 or 9 including the step of forming said finished paper into a plurality of rectangular sheets having a pair of first opposing sides longer than a pair of second opposing sides to define a rectangle whereby said metallized plastic film extends along said rectangle parallel to said second opposing sides.
References Cited (Backward Citations)
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