EP0256176A1
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Security documents
Assignee: Kenrick and Jefferson Ltd
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Filing: 1986-08-07
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Granted: —
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Expires: 2006-08-07
Abstract
Abstract A security document for example a bank pass book has printed on one portion thereof an area 113 containing scrambled indicia and on another portion a transparent area 112 configured as a reading screen for unscrambling the indicia. These two portions are arranged so as to be superimpsable to enable the indicia to be read. Also disclosed is a security document which has an area consisting of a regularly lined image of the indicia on a regularly lined background the lines of the background being displaced laterally relative to the lines of the indicia, together with an overall random pattern or "noise". Photographic and computer methods of generating the scrambled indicia are disclosed.
Inventors
- 👤 Roger Hackwood
- 👤 Geoffrey Leslie Howles
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-09 07:22
CPC Classifications
B; B42; B42D; B42D25/00; B42D25/20; B42D25/29; B42D25/30; B42D25/309; G; G09; G09C; G09C5/00; B42D2033/04; B42D2033/40; B42D2035/14; B42D2035/26; B42D25/318; B42D25/40; B42D25/48; B42D25/485
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
44 words
A security docuent having marked thereon an area consisting of a regularly lined image of indicia on a regularly lined background, the lines of the background being displaced laterally relative to the lines in the indicia, together with an overal random pattern or "noise".
Claim 2
Dependent Claim
44 words
A security docuent having marked thereon an area consisting of a regularly lined image of indicia on a regularly lined background, the lines of the background being displaced laterally relative to the lines in the indicia, together with an overal random pattern or "noise".
Claim 3
Dependent Claim
25 words
A seccurity document as claimed in Claim 1 in which the overal random pattern is provided in the form of random gaps in the lines.
Claim 4
Dependent Claim
29 words
A security document as claimed in Claim 1 in which the overall random pattern is provided in the form of random images superimpsed on the spaces between the lines.
Claim 5
Dependent Claim
29 words
A security document as claimed in any preceding claim in which the lines are straight and parallel and of width equal to the width of the spaces between them.
Claim 6
Dependent Claim
91 words
A method of producing scrambled indicia for printing on a security document as claimed in Claim 1 comprising photographically producing positive and negative transparencies of the indicia, positive and negative transparencies of a line screen and a transparency of the random pattern and photographically printing on the same sheet of photographic material registered images of (a) one transparency of the indicia through one transpareny of the line screen, (b) the other transparency of the indicia through the other transparency of the line screen and (c) the transparency of the random pattern.
Claim 7
Dependent Claim
28 words
A method as claimed in Claim 5 in which the line screen consists of straight lines of width equal to the width of the spaces between the lines.
Claim 8
Dependent Claim
90 words
A method of producing scrambled indicia for printing on a security document as claimed in Claim 1 comprising line sanning the indicia to be scrambled and controlling the operation of a dot printed in accordance with the line san data so as to print lines of dots of alternate phase such that in one line dots appear only where the line scan indicates the presence of indicia snd in the next line only where the indicia are absent, dots being randomly added or omitted to create said overal random pattern.
Claim 9
Dependent Claim
32 words
A method as claimed in claim 7 in which the addition or omission of dots is effected in accordance with data previously derived by line scanning or random pattern or noise scan.
Claim 10
Dependent Claim
25 words
A method as claimed in Claim 7 in which the addition or omission of dots is effective by means of software controlled random number generation.
Claim 11
Dependent Claim
63 words
A security document having printed on one portion thereof an area of scrambled indicia and having on another portion thereof a transparent area configured as a reading sreen for unscrambling said indicia, said one portion and said other portion being so disposed on the document that the other portion can be superimposed on said one portion to enable the indicia to be read.
Claim 12
Dependent Claim
63 words
A security document having printed on one portion thereof an area of scrambled indicia and having on another portion thereof a transparent area configured as a reading sreen for unscrambling said indicia, said one portion and said other portion being so disposed on the document that the other portion can be superimposed on said one portion to enable the indicia to be read.
Claim 13
Dependent Claim
58 words
A security document as claimed in Claim 10 in the form of a book in which said other portion comprises a transparent strip attached to one marginal edge of a front cover of the book, said one portion comprising an area on the inside of a rear cover of the book or on a page of the book.
Claim 14
Dependent Claim
39 words
a security document as claimed in Claim 10 in the form of a book in which said other portion comprises a window in a cover of the book and said one portion is on a page of the book.
Claim 15
Dependent Claim
19 words
A security document as claimed in any of claims 1-4 and also in accordance with any of claims 10-12.
Claim 16
Dependent Claim
22 words
A security document substantially as hereinbefore described with reference to and as shown in Figures 17 and 18 of the accompanying drawings.
Claim 17
Dependent Claim
22 words
A security document substantially as hereinbefore described with reference to and as shown in Figures 17 and 18 of the accompanying drawings.
Claim 18
Independent Claim
21 words
A method of scrambling indicia for printing on a security document substantially as hereinbefore described with reference to Figures 1 to16.
Claim 19
Independent Claim
21 words
A method of scrambling indicia for printing on a security document substantially as hereinbefore described with reference to Figures 1 to16.
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