# US 10,245,866 B2 · Colour imaging of security document precursors > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,245,866 B2 - Document ID: US10245866B2 - Status: Granted - Kind: B2 - Application number: 14/441,603 - Filed: 2013-11-05 - Published: 2015-10-29 - Granted: 2019-04-02 - Earliest claimed: 2012-11-12 - Assignees: Agfa-Gevaert - Applicants: Agfa-Gevaert - Inventors: Bart Waumans; Paul Callant; Bart Aerts - Web page: https://patentgrep.com/patent/US10245866B2 ## CPC - B41J 2/442: {using lasers} - B41M 3/142: {using chemical colour-formers or chemical reactions, e.g. leuco-dye/acid, photochromes} - B32B 27/36: comprising polyesters - B41J 2/435: characterised by selective application of radiation to a printing material or impression-transfer material - B41J 2/4753: {using thermosensitive substrates, e.g. paper} - B41J 3/407: for marking on special material - B41J 3/546: {Combination of different types, e.g. using a thermal transfer head and an inkjet print head} - B41M 3/14: Security printing {(securities B42D25/29)} - B41M 5/34: Multicolour thermography - B42D 25/30: Identification or security features, e.g. for preventing forgery - B42D 25/351: Translucent or partly translucent parts, e.g. windows - B42D 25/378: Special inks - B42D 25/387: absorbing or reflecting ultraviolet light - B42D 25/40: Manufacture - B42D 25/41: using electromagnetic radiation (B42D25/435 takes precedence) - B42D 25/45: Associating two or more layers - B41M 5/30: using chemical colour formers (B41M5/34 takes precedence) - B41M 5/323: Organic colour formers, e.g. leuco dyes - B41M 5/345: {by thermal transfer of dyes or pigments} - B41M 5/38207: {characterised by aspects not provided for in groups B41M5/385 - B41M5/395} - B41M 2205/42: Multiple imaging layers - B41J: TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS - B41M: PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING, (correction of typographical errors B41J; processes for applying transfer pictures or the like B44C1/16; fluid media for correction of typographical errors by coating C09D10/00; printing textiles D06P) - B32B: LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM - B42D: BOOKS; BOOK COVERS; LOOSE LEAVES; PRINTED MATTER CHARACTERISED BY IDENTIFICATION OR SECURITY FEATURES; PRINTED MATTER OF SPECIAL FORMAT OR STYLE NOT OTHERWISE PROVIDED FOR; DEVICES FOR USE THEREWITH AND NOT OTHERWISE PROVIDED FOR; MOVABLE-STRIP WRITING OR READING APPARATUS ## Abstract A method of producing a security document includes the steps of producing a first part of a color image by color laser marking a security document precursor; and producing a second part of the color image by a second imaging technique different from laser marking. The resulting security document is more difficult to falsify. ## Claims ### Claim 1 A method of producing a security document, the method comprising the steps of: producing a first portion of a colour image by laser marking a security document precursor including a laser markable layer containing a leuco dye; and producing a second portion of the colour image by an imaging technique that is different from laser marking; wherein the first portion and the second portion of the colour image are in color registration with each other to form a single image. ### Claim 2 (depends on 1) The method according to claim 1, wherein the second portion of the colour image includes one or more chromatic colours. ### Claim 3 (depends on 2) The method according to claim 2, wherein the one or more chromatic colours includes a spot colour. ### Claim 4 (depends on 1) The method according to claim 1, wherein the imaging technique is thermosublimation printing. ### Claim 5 (depends on 1) The method according to claim 1, wherein the imaging technique is inkjet printing. ### Claim 6 (depends on 5) The method according to claim 5, wherein the inkjet printing includes UV curable inkjet printing. ### Claim 7 (depends on 1) The method according to claim 1, wherein the first portion of the colour image includes two laser markable layers. ### Claim 8 (depends on 1) The method according to claim 1, wherein the security document precursor includes one or more biaxially stretched polyester films. ### Claim 9 (depends on 8) The method according to claim 8, wherein outermost films of the security document precursor are biaxially stretched polyester films. ### Claim 10 (depends on 9) The method according to claim 9, wherein at least one colour laser markable layer of the first portion of the colour image is located between two of the biaxially stretched polyester films. ### Claim 11 (depends on 8) The method according to claim 8, wherein at least one colour laser markable layer of the first portion of the colour image is located between two of the biaxially stretched polyester films. ### Claim 12 (depends on 1) The method according to claim 1, wherein the imaging technique produces a yellow colour. ### Claim 13 (depends on 1) The method according to claim 1, wherein the imaging technique is inkjet printing, xerography, or thermosublimation. ### Claim 14 (depends on 1) The method according to claim 1, wherein the first portion and the second portion together define a single multicolour image. ### Claim 15 (depends on 1) The method according to claim 1, wherein the first portion and the second portion at least partially overlap each other to define colour that is different from a colour of the first portion and a colour of the second portion. ### Claim 16 (depends on 1) The method according to claim 1, wherein the first portion of the colour image includes a first colour laser markable layer and a second colour laser markable layer, the first colour laser markable layer producing a cyan colour or a blue colour and the second colour laser markable layer producing a magenta colour or a red colour. ### Claim 17 (depends on 16) The method according to claim 16, wherein the second portion of the colour image produces a yellow colour or a green colour.