US3852088A - Security document system and method - Google Patents

Security document system and method Download PDF

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Publication number
US3852088A
US3852088A US00235980A US23598072A US3852088A US 3852088 A US3852088 A US 3852088A US 00235980 A US00235980 A US 00235980A US 23598072 A US23598072 A US 23598072A US 3852088 A US3852088 A US 3852088A
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US
United States
Prior art keywords
copiers
ink
indicia
background
blue
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US00235980A
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English (en)
Inventor
R Godlewski
R Harris
M Tinghitella
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
International Business Machines Corp
Original Assignee
International Business Machines Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by International Business Machines Corp filed Critical International Business Machines Corp
Priority to US00235980A priority Critical patent/US3852088A/en
Priority to CA163,472A priority patent/CA990319A/en
Priority to JP48016684A priority patent/JPS5139854B2/ja
Priority to FR7306797A priority patent/FR2177292A5/fr
Priority to SE7302775A priority patent/SE379866B/xx
Priority to IT21311/73A priority patent/IT981201B/it
Priority to CH362373A priority patent/CH573312A5/xx
Priority to AT225773A priority patent/AT327231B/de
Priority to DE2313101A priority patent/DE2313101A1/de
Priority to ES412798A priority patent/ES412798A1/es
Application granted granted Critical
Publication of US3852088A publication Critical patent/US3852088A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G07—CHECKING-DEVICES
    • G07F—COIN-FREED OR LIKE APPARATUS
    • G07F7/00—Mechanisms actuated by objects other than coins to free or to actuate vending, hiring, coin or paper currency dispensing or refunding apparatus
    • G07F7/08—Mechanisms actuated by objects other than coins to free or to actuate vending, hiring, coin or paper currency dispensing or refunding apparatus by coded identity card or credit card or other personal identification means
    • G07F7/086—Mechanisms actuated by objects other than coins to free or to actuate vending, hiring, coin or paper currency dispensing or refunding apparatus by coded identity card or credit card or other personal identification means by passive credit-cards adapted therefor, e.g. constructive particularities to avoid counterfeiting, e.g. by inclusion of a physical or chemical security-layer
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
    • B41M3/00—Printing processes to produce particular kinds of printed work, e.g. patterns
    • B41M3/14—Security printing
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03C—PHOTOSENSITIVE MATERIALS FOR PHOTOGRAPHIC PURPOSES; PHOTOGRAPHIC PROCESSES, e.g. CINE, X-RAY, COLOUR, STEREO-PHOTOGRAPHIC PROCESSES; AUXILIARY PROCESSES IN PHOTOGRAPHY
    • G03C5/00—Photographic processes or agents therefor; Regeneration of such processing agents
    • G03C5/08—Photoprinting; Processes and means for preventing photoprinting
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G21/00—Arrangements not provided for by groups G03G13/00 - G03G19/00, e.g. cleaning, elimination of residual charge
    • G03G21/04—Preventing copies being made of an original
    • G03G21/043—Preventing copies being made of an original by using an original which is not reproducible or only reproducible with a different appearence, e.g. originals with a photochromic layer or a colour background
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S283/00—Printed matter
    • Y10S283/902—Anti-photocopy

Definitions

  • ABSTRACT Illegal or unauthorized reproduction of classified or copyrighted indicia by a variety of convenience office copiers operating in different energy ranges is inhibited.
  • This indicia is pressure-transferred from a typewriter ribbon or carbon-like sheet, or printed directly, with an ink of one color onto a masking background of another color provided on an opaque substrate.
  • the ink is light reflective to those convenience office copiers, like the Xerox 2400, that operate predominantly in the blue spectral region, and also to those thermographic copiers, like the 3M Thermofax copiers, that operate in the infrared spectral range, so that these copiers will not see the indicia.
  • the ink is at least partially light absorptive to those copiers, like the currently marketed IBM Copier, that operate predomi
  • FIG. 2 i AM t -4 500 400 5'00 bOU l VlSIBLE SPEClRUM l (00 8'00 060 idno WAVE LENGlH (MILLIMICRONS) LIGHT 25% FINE TINT FORMAT NEGATIVE 25% COARSE TINT DUPLICATING FILM FIG. 2
  • FIG. 1 is a diagram depicting the operating energy levels for three distinct classes of commercially available convenience office copiers that peak at different wavelengths, and the reflectance characteristics of applicants distinctive ink and background relative thereto;
  • FIG. 2 is a diagrammatic showing of the process by which the masking background is prepared.
  • FIG. 3 is an enlarged fragmentary view of applicants distinctive masking background.
  • curve A depicts the approximate operating energy range of one class of electrostatic convenience copiers that operates predominantly in the blue region of the electromagnetic spectrum with ergy range of still another class of copiers, namely thermographic copiers, that employ infrared light sources and depend upon the absorption of infrared radiation for the production of legible copy; this class includes the 3M Thermofax copiers.
  • thermographic copiers that employ infrared light sources and depend upon the absorption of infrared radiation for the production of legible copy; this class includes the 3M Thermofax copiers.
  • curve D is included to depict the approximate reflectance characteristics of the conventional uncoated white-bond copy papers normally used with electrostatic copiers of the types depicted in curves A, B.
  • Curve E is included to depict the approximate reflectance of a typical black ink.
  • Curve F depicts the relative reflectance of applicants distinctive bright blue ink, hereinbelowdescribed, for printing the classified indicia; whereas curve G depicts the relative reflectance of the ink in applicants distinctive, masking background.
  • These curves D, E, F, G show reflectance characteristics in percentage, referenced against manganese oxide as as measured by a Beckman DK-2A Spectroreflectometer, at various wavelengths as measured in millimicrons.
  • applicants bright blue ink is a non-light absorptive (i.e., reflective) to electrostatic copiers having operating energy peaks within the blue spectral region and to thermographic copiers; hence, indicia imprinted in such ink will not be seen by such copiers.
  • such ink is sufficiently light absorptive to copiers having operating energy peaks within the green and blue-green regions that it will be seen by such copiers; but these copiers will fail to distinguish the indicia printed in said ink from a distinctive camouflaging background that is not objectionable from a human factors standpoint.
  • This masking or camouflaging background preferably is of a color, such as hereinafter disclosed, the absorbs light to a greater degree than the blue ink in all classes of copiers operating predominantly in the blue, green, bluegreen or infrared regions.
  • the background is similar to black.
  • the reasons for the background are (a) to mask the indicia that would otherwise legibly reproduce in those copiers operating predominantly in the blue-green to green re gion, and (b) provide deteriorated, though legible, reproduction of the indicia in broad spectrum white-light copiers, such as the Xerox 4000 and 7000, and zincoxide coated paper copiers, such as the Bruning 2000.
  • the masking background is very absorptive (i.e., exhibits low reflectance) through the visible region of the spectrum, including the blue, blue-green, and green regions.
  • the background is somewhat less absorptive in the infrared region, a comparison of curves G and F shows that the background is nevertheless more absorptive than the blue ink in said region.
  • the background is somewhat absorptive, although to a lesser degree than the blue ink, in the wavelengths between the green and infrared regions.
  • OPERATION was typed onto 20-pound bond white paper.
  • the format may be typed onto any photographically acceptable surface or substrate in lieu of the 20-pound bond white paper. Also be repeated in close proximity to a similar letter or symbol.
  • the composite master negative is created by conventional exposure controlmethods that will insure exact dot-for-dot reproduction; e.g., by use of gray scales, star targets, dot form scales, and resolution line
  • the mezzo tints used were those commercially available from Direct Image Corp., Monterey Park, Calif.
  • the duplicating film used was that designated as MRK 471 CRW-4 sold by E.I. du Pont de Nemours and Co.,
  • the master composite negative created in the manner just described was then used to prepare a lithographic plate in conventional manner.
  • the negative may be used to prepare other types of printing plates (e.g., relief printing plates) suitable for the particular printing process to be employed.
  • the color of the masking background is critical in that it must absorb light to a greater degree than the pigment in all copiers operating predominantly in blue-green to green region.
  • the Pantone Matching System developed by Pantone Press, Inc. expresses colors in a certified matching system that is well known as a standard to those skilled in the art. This system, in which all constituents are expressed in parts by weight, defines the PMS 456 ink formulation as:
  • the confidential or copyrighted indicia which is not to be machine copied was printed on the masking back ground by applicants blue ink, which was specially formulated to match the spectrally blind region of the Xerox 2400 copier.
  • This blind region is substantially identical for the Xerox 660, 720, 914, 2400, 3600I and 3600 II electrostatic copiers; andhence it is to be understood that unless otherwise specifically stated, the characteristics described with respect to the Xerox 2400 copier are deemed to apply with equal force to these other specifically identified Xerox copiers.
  • the blue ink employed in the formulation preferably has spectral characteristics similar to those shown in curve F of FIG. 1.
  • Preferred pigments for use in applicants distinctive blue ink are those of the phthalocyanine blue type which exhibit a broad reflectance curve in the blue region in which the Xerox 2400 copiers operate.
  • the background pattern serves to camouflage the indicia overprinted in the special blue ink, for a legible copy of such indicia would be reproduced by the IBM Copier in the absence of such a background.
  • the background pattern is a stronger competitor for toner than the indicia overprinted in the blue ink, thus helping to provide illegible copy when such ink and background are concurrently employed.
  • the blue ink when used in conjunction with the background pattern illustrated above and to enlarged scale in FIG. 3, affords a high degree of acceptance from a human factors standpoint, while at the same time assuring against reproduction of legible copies of the classified indicia on both the Xerox 2400 type and the IBM type electrostatic copiers and on thermographic copiers.
  • the nonrproducible classified indicia was printed in a lithographic press over a masking background that had previously been printed on a paper substrate in a lithographic press. It is to be understood, however, that this indicia can be applied by a number of other media; i.e., from a typewriter ribbon impregnated with a suitable formulation containing this special blue pigment, from a separate transfer sheet (in the nature of carbon paper) coated with a suitable formulation including such pigment, by a toner containing such pigment and used in electrostatic copiers, or by a hand-manipulated pen or pencil having an ink or lead embodying such pigment.
  • the term medium as employed in the claims is intended to be broadly construed to embrace any means, such as an ink or the other means just specified, for carrying the pigment and/or applying it as legible indicia to the masking background.
  • the masking background may take forms or employ formulations other than those herein specifically disclosed or be applied by different printing or screening techniques, so long as the color is maintained at or close to that known as PMS 456.
  • the blue ink herein disclosed when used in conjunction with the masking background above described produced legible, but hard to read, copy on most so-called broad spectrum white-light copiers, such as the Xerox 4000 and 7000 electrostatic copiers; it also produced poor quality copies in the electrostatic copiers, such as the Bruning 2000, employing zinc-oxide coated paper.
  • the method of precluding generation of legible copies of human readable indicia from a master by any one of a plurality of convenience office copiers having different operating energy ranges comprising the steps of providing an ink of a color that is highly reflective across the operating energy range of at least one group of copiers including electrostatic copiers operating predominantly in the blue region of the spectrum and thermographic copiers operating in the infrared region of the spectrum, but which ink is at least partially absorptive within different operating energy ranges of another group of copiers including electrostatic copiers operating predominantly in the green to blue-green regions of the spectrum,
  • the masking background comprises a predetermined format of a plurality of different contiguous symbols, no identical two of which are directly adjacent each other, and each of which symbols is defined by screened discontinuities.
  • a security document system comprising, in combination,
  • a medium carrying a pressure-transferrable visible ink or the like of a color that exhibits high reflectance when indicia printed therewith is sought to be reproduced in one class of convenience office copiers including electrostatic copiers that operate predominantly within the blue region of the spectrum but is at least partially absorptive when such indicia is sought to be reproduced in a different class of convenience office copiers including electrostatic copiers that operate predominantly within the green to blue-green region of the spectrum, and
  • an opaque substrate having on at least one surface a visible masking background of another color, said surface adapted to be printed over by a typewriter or the like with legible indicia from said medium,
  • said other color being one which absorbs light when the background formed thereof is reproduced thereby to inhibit reproduction of said legible indicia by any copiers operating in any of said energy ranges, inasmuch as said one class of copiers will fail to reproduce the indicia printed with said ink because of its reflectance and said different class of copiers will reproduce illegible indicia printed in said ink and masked by said background.
  • indicia is in an ink comprising a bright phthalocyanine blue pigment, and the background is essentially of a color identified as PMS 456.
  • a security document system comprising a substrate providing a surface of high brightness with a masking background applied thereto which is of a color substantially identical with that known as PMS 456, and
  • a medium for apply over the background visible indicia in a formulation comprising a bright blue phthalocyanine pigment is provided.
  • said electrostatic copiers of said one class will fail to reproduce the indicia printed in said ink because of its reflectance and said electrostatic copiers of the other class will reproduce illegible indicia printed in said ink-and masked by said background.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Computer Security & Cryptography (AREA)
  • Printing Methods (AREA)
  • Credit Cards Or The Like (AREA)
  • Combination Of More Than One Step In Electrophotography (AREA)
US00235980A 1972-03-20 1972-03-20 Security document system and method Expired - Lifetime US3852088A (en)

Priority Applications (10)

Application Number Priority Date Filing Date Title
US00235980A US3852088A (en) 1972-03-20 1972-03-20 Security document system and method
CA163,472A CA990319A (en) 1972-03-20 1973-02-08 Security document system and method
JP48016684A JPS5139854B2 (ru) 1972-03-20 1973-02-12
FR7306797A FR2177292A5 (ru) 1972-03-20 1973-02-20
SE7302775A SE379866B (ru) 1972-03-20 1973-02-28
IT21311/73A IT981201B (it) 1972-03-20 1973-03-08 Sistema e procedimento per impe dipe la riproduzione di documen ti mediante le copiatrici da uf ficio
CH362373A CH573312A5 (ru) 1972-03-20 1973-03-13
AT225773A AT327231B (de) 1972-03-20 1973-03-14 Verfahren zum herstellen von schriftstucken oder druckwerken
DE2313101A DE2313101A1 (de) 1972-03-20 1973-03-16 Verfahren und farbstoff zum schutz von schriftstuecken oder druckwerken gegen unbefugtes kopieren
ES412798A ES412798A1 (es) 1972-03-20 1973-03-17 El metodo de impedir la generacion de copias legibles de signos que pueden ser leidos por una persona, a partir de unoriginal.

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US00235980A US3852088A (en) 1972-03-20 1972-03-20 Security document system and method

Publications (1)

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US3852088A true US3852088A (en) 1974-12-03

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US00235980A Expired - Lifetime US3852088A (en) 1972-03-20 1972-03-20 Security document system and method

Country Status (10)

Country Link
US (1) US3852088A (ru)
JP (1) JPS5139854B2 (ru)
AT (1) AT327231B (ru)
CA (1) CA990319A (ru)
CH (1) CH573312A5 (ru)
DE (1) DE2313101A1 (ru)
ES (1) ES412798A1 (ru)
FR (1) FR2177292A5 (ru)
IT (1) IT981201B (ru)
SE (1) SE379866B (ru)

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US3977785A (en) * 1975-01-06 1976-08-31 Xerox Corporation Method and apparatus for inhibiting the operation of a copying machine
US4066280A (en) * 1976-06-08 1978-01-03 American Bank Note Company Documents of value printed to prevent counterfeiting
US4118122A (en) * 1977-02-07 1978-10-03 Xerox Corporation Method of rendering objects uncopyable by photocopy processes
US4175776A (en) * 1978-01-05 1979-11-27 New England Mutual Life Insurance Company Counterfeit resistant document
US4175774A (en) * 1978-03-23 1979-11-27 American Standard Inc. Non-copying printed document and method of printing same
US4176859A (en) * 1978-05-15 1979-12-04 Safron Printing Company Non-counterfeitable documents
US4210346A (en) * 1977-06-23 1980-07-01 Burroughs Corporation Protected document bearing watermark and method of making
US4227719A (en) * 1978-09-20 1980-10-14 Burroughs Corporation Protection system for documents
US4227720A (en) * 1978-11-08 1980-10-14 Burroughs Corporation Protected document
US4265469A (en) * 1977-05-18 1981-05-05 Burroughs Corporation Protected document and method of making same
US4277514A (en) * 1978-03-07 1981-07-07 Toppan Printing Co., Ltd. Forgery resistant document with colored areas and method for thwarting reproduction of same
US4281921A (en) * 1979-09-17 1981-08-04 Auken John A Van Plural color anti-copying systems for xerographic and electrostatic copying machines
US4310180A (en) * 1977-05-18 1982-01-12 Burroughs Corporation Protected document and method of making same
US4325981A (en) * 1978-03-07 1982-04-20 Toppan Printing Co., Ltd. Method of preventing color accurate reproductions using color photocopiers and the like
WO1984002108A1 (en) * 1982-12-02 1984-06-07 Paper Inc Method of and apparatus for treating printed paper
EP0111597A1 (en) * 1981-05-25 1984-06-27 Nocopi International Inc. Method of rendering documents resistant to photocopying, and anti-copying paper
EP0119344A1 (en) * 1983-03-16 1984-09-26 Norman A. Gardner Method of rendering documents resistant to photocopying and anticopying paper therefor
US4586811A (en) * 1982-04-23 1986-05-06 Ricoh Company, Ltd. Confidential document reproduction prevention method
US4705300A (en) * 1984-07-13 1987-11-10 Optical Coating Laboratory, Inc. Thin film optically variable article and method having gold to green color shift for currency authentication
US4779898A (en) * 1986-11-21 1988-10-25 Optical Coating Laboratory, Inc. Thin film optically variable article and method having gold to green color shift for currency authentication
US4791449A (en) * 1986-05-30 1988-12-13 Xerox Corporation System for prevention of unauthorized copying
WO1989007819A1 (en) * 1988-02-11 1989-08-24 Vogel Peter S Document marking system
US4908873A (en) * 1983-05-13 1990-03-13 Philibert Alex C Document reproduction security system
US5216724A (en) * 1989-02-10 1993-06-01 Canon Kabushiki Kaisha Apparatus for image reading or processing
DE4241663A1 (de) * 1992-12-04 1994-06-09 Borus Spezialverfahren Verfahren zur Kennzeichnung und Erkennung eines Gegenstands
US5369273A (en) * 1992-09-08 1994-11-29 Borus Spezialverfahren Und -Gerate Im Sondermaschinen-Bau Gmbh Method for labeling an object using laser radiation
US5434649A (en) * 1988-05-13 1995-07-18 Canon Kabushiki Kaisha Device and method for controlling a color image processing apparatus in which a predetermined pattern can be identified in an original
US5444518A (en) * 1992-08-05 1995-08-22 Ricoh Company, Ltd. Image forming apparatus which adds identification information to recorded images to prevent forgery
US5475468A (en) * 1992-11-20 1995-12-12 Toppan Printing Co., Ltd. Method and copying machine for preventing illegal copying
US5487567A (en) * 1992-04-24 1996-01-30 Francois-Charles Oberthur Group Printing method and copy-evident secure document
US5713062A (en) * 1996-09-26 1998-01-27 Xerox Corporation Color mixing and control system for use in an electrostatographic printing machine
US5752152A (en) * 1996-02-08 1998-05-12 Eastman Kodak Company Copy restrictive system
US5768674A (en) * 1997-04-30 1998-06-16 Eastman Kodak Company Apparatus for creating copy restrictive media
US5823576A (en) * 1994-05-06 1998-10-20 Lew Lambert Copy-resistant document
US5983065A (en) * 1997-07-23 1999-11-09 Xerox Corporation Method of printing secure documents
US20010022667A1 (en) * 2000-03-09 2001-09-20 Akira Yoda Method, apparatus, and recording medium for outputting images
WO2006029431A2 (de) * 2004-09-14 2006-03-23 Oesterreichische Banknoten- Und Sicherheitsdruck Gmbh Sicherheitsmerkmal für sicherheitsdokumente
US20060082844A1 (en) * 2004-10-14 2006-04-20 White Don M Process color with interference pigments
US20090236844A1 (en) * 2008-02-14 2009-09-24 Documotion Research, Inc. Tamper evident materials for securely carrying information

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JPS5811172B2 (ja) * 1974-06-28 1983-03-01 株式会社クボタ ボクソウナドノ ソウコウシキアツシユクコンボウキ
JPS5811171B2 (ja) * 1974-06-28 1983-03-01 株式会社クボタ ボクソウナドノ ソウコウシキアツシユクコンボウキ
JPS5340110Y2 (ru) * 1975-09-02 1978-09-28
JPS5422689Y2 (ru) * 1975-09-19 1979-08-07
JPS585469Y2 (ja) * 1975-12-30 1983-01-29 三菱農機株式会社 ホシクサコンポウキノアツシユククドウソウチ
JPS52165066U (ru) * 1976-06-08 1977-12-14
FR2385161A1 (fr) * 1977-02-08 1978-10-20 Burroughs Corp Moyen de protection de document et document ainsi realise
JPS5545711U (ru) * 1978-09-20 1980-03-25
FR2503890A1 (fr) * 1979-09-17 1982-10-15 Auken John Van Systeme anti-copie a plusieurs couleurs pour des machines de copie xerographiques et electrostatiques
JPS58104580U (ja) * 1982-01-09 1983-07-16 三菱電機株式会社 カ−ドエツジ形コネクタ
FR2565268B1 (fr) * 1984-06-05 1987-10-30 Guerimand Voiron Support d'impression non photocopiable
JPS621557U (ru) * 1985-06-21 1987-01-07
JP2516420B2 (ja) * 1989-01-30 1996-07-24 株式会社タカキタ ロ―ルベ―ラ―
DE3905155C2 (de) * 1989-02-20 1997-12-11 Gao Ges Automation Org Datenträger, insbesondere Sicherheitsdokument mit in Farbkopierern nur verfälscht reproduzierbarem Druckbild
DE3921636C2 (de) * 1989-06-30 1998-07-09 Schwarz Druck Gmbh & Co Kg Gegen Farbkopieren geschütztes Druckerzeugnis
DE4220344C2 (de) * 1992-06-24 1994-06-23 Trautwein Gmbh & Co Gegen Vervielfältigung und/oder mißbräuchliche Entfernung und Wiederverwendung geschützte Plakette
DE29513468U1 (de) * 1995-08-22 1997-01-02 Hummel GmbH & Co., 71106 Magstadt Fälschungssicheres Dokument

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Cited By (51)

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Publication number Priority date Publication date Assignee Title
US3977785A (en) * 1975-01-06 1976-08-31 Xerox Corporation Method and apparatus for inhibiting the operation of a copying machine
US4066280A (en) * 1976-06-08 1978-01-03 American Bank Note Company Documents of value printed to prevent counterfeiting
US4118122A (en) * 1977-02-07 1978-10-03 Xerox Corporation Method of rendering objects uncopyable by photocopy processes
US4310180A (en) * 1977-05-18 1982-01-12 Burroughs Corporation Protected document and method of making same
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Also Published As

Publication number Publication date
SE379866B (ru) 1975-10-20
AT327231B (de) 1976-01-26
CA990319A (en) 1976-06-01
DE2313101A1 (de) 1973-09-27
ATA225773A (de) 1975-04-15
ES412798A1 (es) 1976-01-01
IT981201B (it) 1974-10-10
JPS496929A (ru) 1974-01-22
FR2177292A5 (ru) 1973-11-02
CH573312A5 (ru) 1976-03-15
JPS5139854B2 (ru) 1976-10-30

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