CA2032587A1 - Data carrier having a liquid crystal security element - Google Patents
Data carrier having a liquid crystal security elementInfo
- Publication number
- CA2032587A1 CA2032587A1 CA2032587A CA2032587A CA2032587A1 CA 2032587 A1 CA2032587 A1 CA 2032587A1 CA 2032587 A CA2032587 A CA 2032587A CA 2032587 A CA2032587 A CA 2032587A CA 2032587 A1 CA2032587 A1 CA 2032587A1
- Authority
- CA
- Canada
- Prior art keywords
- liquid crystal
- security element
- data carrier
- plastics
- crystal security
- 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.)
- Granted
Links
- 239000004973 liquid crystal related substance Substances 0.000 title abstract 2
- 229920000106 Liquid crystal polymer Polymers 0.000 abstract 2
- 239000004977 Liquid-crystal polymers (LCPs) Substances 0.000 abstract 2
- 239000003086 colorant Substances 0.000 abstract 1
- 239000000463 material Substances 0.000 abstract 1
- 239000000047 product Substances 0.000 abstract 1
- 239000011265 semifinished product Substances 0.000 abstract 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B42—BOOKBINDING; ALBUMS; FILES; SPECIAL PRINTED MATTER
- 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
- B42D25/00—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof
- B42D25/30—Identification or security features, e.g. for preventing forgery
- B42D25/36—Identification or security features, e.g. for preventing forgery comprising special materials
- B42D25/364—Liquid crystals
-
- 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
- B42—BOOKBINDING; ALBUMS; FILES; SPECIAL PRINTED MATTER
- 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
- B42D25/00—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B42—BOOKBINDING; ALBUMS; FILES; SPECIAL PRINTED MATTER
- 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
- B42D25/00—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof
- B42D25/30—Identification or security features, e.g. for preventing forgery
- B42D25/355—Security threads
-
- B42D2033/26—
Landscapes
- Engineering & Computer Science (AREA)
- Computer Security & Cryptography (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Chemical & Material Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Credit Cards Or The Like (AREA)
- Liquid Crystal (AREA)
- Burglar Alarm Systems (AREA)
- Laminated Bodies (AREA)
Abstract
A data carrier such as an identity card or a paper of value protected against attempted forgery using color copiers and containing an optically variable security element made of a liquid crystal material. The security element. e.g. a safeguarding thread, has a plastics-like layer made of a liquid crystal polymer which shows a pronounced play of colors at room temperature. The plastics-like properties of liquid crystal polymers permit easy processing into a semifinished product or into the finished product, so that completely different types of security elements can be produced.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DEP3942663.7 | 1989-12-22 | ||
DE3942663A DE3942663A1 (en) | 1989-12-22 | 1989-12-22 | DATA CARRIER WITH A LIQUID CRYSTAL SECURITY ELEMENT |
Publications (2)
Publication Number | Publication Date |
---|---|
CA2032587A1 true CA2032587A1 (en) | 1991-06-23 |
CA2032587C CA2032587C (en) | 1996-07-09 |
Family
ID=6396250
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
CA002032587A Expired - Fee Related CA2032587C (en) | 1989-12-22 | 1990-12-18 | Data carrier having a liquid crystal security element |
Country Status (6)
Country | Link |
---|---|
EP (1) | EP0435029B2 (en) |
JP (1) | JP3244278B2 (en) |
AT (1) | ATE126135T1 (en) |
CA (1) | CA2032587C (en) |
DE (2) | DE3942663A1 (en) |
ES (1) | ES2075871T5 (en) |
Cited By (16)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2276883A (en) * | 1993-04-05 | 1994-10-12 | Central Research Lab Ltd | Optical material containing a liquid crystal |
US5629055A (en) * | 1994-02-14 | 1997-05-13 | Pulp And Paper Research Institute Of Canada | Solidified liquid crystals of cellulose with optically variable properties |
US5678863A (en) * | 1992-07-24 | 1997-10-21 | Portals Limited | High value documents |
US5851604A (en) * | 1994-05-06 | 1998-12-22 | Consortium Fur Elektrochemische Industrie Gmbh | Interference pigments comprising molecules fixed in a cholesteric configuration, and use thereof |
US6273473B1 (en) | 1996-10-10 | 2001-08-14 | Securency Pty Ltd | Self-verifying security documents |
US7040663B1 (en) | 1999-02-23 | 2006-05-09 | Giesecke & Devrient, Gmbh | Value document |
US7386125B2 (en) | 2002-10-28 | 2008-06-10 | Qdesign Usa, Inc. | Techniques of imperceptibly altering the spectrum of a displayed image in a manner that discourages copying |
US7728931B2 (en) | 2004-04-30 | 2010-06-01 | Giesecke & Devrient Gmbh | Security element and method for producing same |
CN102759441A (en) * | 2012-07-20 | 2012-10-31 | 西北工业大学 | Multiband polarization imaging anti-counterfeiting element identification system |
EP1226308B2 (en) † | 1999-08-31 | 2012-11-14 | Giesecke & Devrient GmbH | Safety element and a valuable object |
US8322753B2 (en) | 2006-11-22 | 2012-12-04 | Nhk Spring Co., Ltd. | Identification medium, identification method, and identification apparatus |
US8350259B2 (en) | 2008-05-30 | 2013-01-08 | Polyic Gmbh & Co. Kg | Electronic circuit |
US8432589B2 (en) | 2007-05-21 | 2013-04-30 | Ovd Kinegram Ag | Multi-layer body having optical-action elements for producing an optical effect |
US8883273B2 (en) | 2006-08-10 | 2014-11-11 | De La Rue International Limited | Photonic crystal security device |
US8927072B2 (en) | 2006-08-10 | 2015-01-06 | De La Rue International Limited | Photonic crystal security device |
US8968856B2 (en) | 2006-03-31 | 2015-03-03 | Giesecke & Devrient Gmbh | Security element and method for its production |
Families Citing this family (90)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5766738A (en) * | 1979-12-28 | 1998-06-16 | Flex Products, Inc. | Paired optically variable article with paired optically variable structures and ink, paint and foil incorporating the same and method |
GB9025390D0 (en) * | 1990-11-22 | 1991-01-09 | De La Rue Thomas & Co Ltd | Security device |
GB9106128D0 (en) * | 1991-03-22 | 1991-05-08 | Amblehurst Ltd | Article |
FR2698390B1 (en) * | 1992-11-20 | 1994-12-23 | Arjo Wiggins Sa | Security document authenticated by piezooptic effect. |
GB2283455B (en) * | 1993-11-03 | 1997-01-15 | Willett Int Ltd | Method for authenticating or confirming the integrity of a document or other ing and articles for use in the method |
EP0689065B1 (en) | 1994-06-24 | 2001-06-27 | Rolic AG | Optical component |
US5903330A (en) * | 1995-10-31 | 1999-05-11 | Rolic Ag | Optical component with plural orientation layers on the same substrate wherein the surfaces of the orientation layers have different patterns and direction |
EP0917369B1 (en) | 1996-08-05 | 2007-04-04 | Matsushita Electric Industrial Co., Ltd. | Data transmitter, data receiver, processor, equipment managing device, equipment managing system, data transmitting-receiving system, and medium |
DE19639229A1 (en) * | 1996-09-24 | 1997-06-05 | Wacker Chemie Gmbh | Composition with matrix containing pigment with angle-dependent colour in different matrix |
DE19645084A1 (en) * | 1996-11-01 | 1998-05-07 | Austria Card Gmbh | Identification card with additional security features and processes for their production |
FR2764314A1 (en) * | 1997-06-09 | 1998-12-11 | Arjo Wiggins Sa | Security document with integrated authentication system |
DE69832574T2 (en) * | 1997-07-29 | 2006-06-14 | Nhk Spring Co Ltd | Optical identification system with cholesteric liquid crystals |
DE19735628C2 (en) * | 1997-08-18 | 1999-10-14 | Johannes Puff | Procedure to prevent counterfeiting of a non-personal means of access authorization |
DE19737612A1 (en) * | 1997-08-28 | 1999-03-04 | Consortium Elektrochem Ind | Machine-detectable security marking, production of the security marking and security system that cannot be recognized by the eye and encompass this security marking |
DE19737618A1 (en) * | 1997-08-28 | 1999-03-04 | Consortium Elektrochem Ind | Machine-detectable security marking with increased protection against forgery, production of the security marking and security system comprising this security marking |
DE19743722A1 (en) * | 1997-10-02 | 1999-04-08 | Wacker Chemie Gmbh | Polysiloxanes with heterocyclic functions, their production and use |
US20020117845A1 (en) | 2000-01-03 | 2002-08-29 | Bundesdruckerei Gmbh | Security and/or valve document |
DE19833746A1 (en) * | 1998-07-27 | 2000-02-03 | Joergen Brosow | Security paper and method for checking authenticity of documents recorded on it protects securities like bank notes against forgery by using embedded electronic switching circuit |
JP4336008B2 (en) * | 1998-11-17 | 2009-09-30 | 日本発條株式会社 | Object identification structure and identification method |
DE19904282C2 (en) * | 1999-02-03 | 2002-05-29 | Xetos Ag | information carrier |
DE19909471A1 (en) * | 1999-03-04 | 2000-09-07 | Bayerische Motoren Werke Ag | Decorative element |
AU2792100A (en) † | 1999-04-07 | 2000-11-14 | Trub Ag | Data carrier and method for producing same |
WO2000065383A1 (en) | 1999-04-21 | 2000-11-02 | Nippon Mitsubishi Oil Corporation | Optical laminate |
ATE483590T1 (en) * | 1999-05-24 | 2010-10-15 | Toppan Printing Co Ltd | COMPOSITE COMPOSITE BODY, INFORMATION STORAGE MEDIUM AND DEVICE FOR APPLYING ANTI-COUNTERFEIT FEATURES |
JP2001091719A (en) * | 1999-09-27 | 2001-04-06 | Nippon Mitsubishi Oil Corp | Optical device and security device |
DE10007916A1 (en) | 2000-02-21 | 2001-08-23 | Giesecke & Devrient Gmbh | Multilayer laminated card with interposed security element having relief structures |
DE10008851A1 (en) † | 2000-02-25 | 2001-08-30 | Giesecke & Devrient Gmbh | Manufacturing laser-writeable data media involves applying transparent, optically variable layer then producing marking through optically variable layer by action of laser beam |
JP2002040252A (en) * | 2000-07-27 | 2002-02-06 | Shiseido Co Ltd | Optical sheet containing cholesteric liquid crystal layer, information recording body using the same, method for recording information and method for discriminating information |
GB0025096D0 (en) * | 2000-10-13 | 2000-11-29 | Bank Of England | Detection of printing and coating media |
JP2002127647A (en) | 2000-10-19 | 2002-05-08 | Nhk Spring Co Ltd | Discriminating medium of object and manufacturing method thereof |
JP4565591B2 (en) * | 2000-11-29 | 2010-10-20 | トッパン・フォームズ株式会社 | Card holding cholesteric liquid crystalline compounds |
EP1227347A1 (en) * | 2001-01-29 | 2002-07-31 | Rolic AG | Optical device and method for manufacturing same |
CA2445080A1 (en) | 2001-04-24 | 2002-10-31 | Merck Patent Gesellschaft Mit Beschraenkter Haftung | Birefringent marking |
EP1281538A3 (en) | 2001-07-02 | 2004-01-28 | MERCK PATENT GmbH | Optically variable marking |
US7081282B2 (en) | 2001-07-02 | 2006-07-25 | Merck Patent Gmbh | Optically variable marking |
GB0201767D0 (en) | 2002-01-25 | 2002-03-13 | Rue De Int Ltd | Improvements in methods of manufacturing substrates |
JP2003231380A (en) | 2002-02-12 | 2003-08-19 | Nhk Spring Co Ltd | Discrimination medium for object and discrimination method |
JP2003337218A (en) * | 2002-05-21 | 2003-11-28 | Nippon Oil Corp | Laminated body for transfer |
DE10222433A1 (en) * | 2002-05-22 | 2003-12-11 | Kurz Leonhard Fa | Strip-shaped security element |
WO2004024439A1 (en) | 2002-09-13 | 2004-03-25 | Nhk Spring Co., Ltd. | Object identifying medium using multi-layer thin-film |
DE10243650A1 (en) * | 2002-09-19 | 2004-04-01 | Giesecke & Devrient Gmbh | security element |
JP2004133152A (en) * | 2002-10-10 | 2004-04-30 | Nippon Oil Corp | Transferable liquid crystal laminate |
TWI334382B (en) | 2003-07-14 | 2010-12-11 | Flex Products Inc | Vacuum roll coated security thin film interference products with overt and/or covert patterned layers |
DE10331798B4 (en) * | 2003-07-14 | 2012-06-21 | Giesecke & Devrient Gmbh | Security element, valuable item, transfer material and manufacturing process |
DE10342674B4 (en) * | 2003-09-16 | 2007-07-19 | Leonhard Kurz Gmbh & Co. Kg | Method and film system for producing an individualized optically variable element |
AT501320B1 (en) * | 2003-09-17 | 2008-10-15 | Hueck Folien Gmbh | PASSIVE ACTIVE SAFETY FEATURE |
DE10343547A1 (en) | 2003-09-19 | 2005-04-14 | Giesecke & Devrient Gmbh | Object of value comprises a security element with at least one liquid crystal material which produces a linear light polarization and/or a dichroic effect with an orientation dependent refraction index |
JP4257903B2 (en) | 2003-10-28 | 2009-04-30 | 日本発條株式会社 | Identification medium, identification medium identification method, identification target article, and identification apparatus |
EP1761590B1 (en) * | 2003-11-21 | 2009-08-05 | Merck Patent GmbH | Method for modifying chiral liquid crystal films with the aid of extracting agents |
US7818782B2 (en) * | 2004-04-14 | 2010-10-19 | Dai Nippon Printing Co., Ltd. | Authentication medium, authenticable substrate, authentication medium label, authentication medium transfer sheet, authenticable sheet, and authenticable information recording medium |
DE102004018702B4 (en) * | 2004-04-17 | 2006-05-24 | Leonhard Kurz Gmbh & Co. Kg | Film with polymer layer |
DE102004021247A1 (en) | 2004-04-30 | 2005-11-24 | Giesecke & Devrient Gmbh | Security element and method for its production |
DE102004039355A1 (en) | 2004-08-12 | 2006-02-23 | Giesecke & Devrient Gmbh | Security element and method for its production |
EP2123471B1 (en) | 2004-04-30 | 2015-07-08 | Giesecke & Devrient GmbH | Safety element and method for its production |
DE102004021248A1 (en) | 2004-04-30 | 2005-11-24 | Giesecke & Devrient Gmbh | Security element and method for its production |
RU2377133C2 (en) | 2004-04-30 | 2009-12-27 | Гизеке Унд Девриент Гмбх | Material of foil and method of its production |
GB0412979D0 (en) | 2004-06-10 | 2004-07-14 | Rue De Int Ltd | Improvements in security devices |
JP4549119B2 (en) | 2004-07-15 | 2010-09-22 | 日本発條株式会社 | Identification medium and article provided with identification medium |
GB0419157D0 (en) | 2004-08-27 | 2004-09-29 | Rue De Int Ltd | A method of manufacturing a fibrous substrate incorporating an elongate element |
JP4539909B2 (en) | 2004-10-01 | 2010-09-08 | 日本発條株式会社 | Identification medium and identification method thereof |
FR2877609B1 (en) * | 2004-11-08 | 2007-03-09 | Arjowiggins Security Soc Par A | SAFETY STRUCTURE AND ARTICLE INCORPORATING SUCH A STRUCTURE |
US20080138543A1 (en) * | 2004-12-24 | 2008-06-12 | Nhk Spring Co., Ltd. | Identification Medium, Article Equipped With Identification Medium, Identifying Method And Device |
DE102005017655B4 (en) | 2005-04-15 | 2008-12-11 | Polyic Gmbh & Co. Kg | Multilayer composite body with electronic function |
DE102005031448A1 (en) * | 2005-07-04 | 2007-01-11 | Polyic Gmbh & Co. Kg | Activatable optical layer |
DE102005035589A1 (en) | 2005-07-29 | 2007-02-01 | Polyic Gmbh & Co. Kg | Manufacturing electronic component on surface of substrate where component has two overlapping function layers |
DE102005044306A1 (en) | 2005-09-16 | 2007-03-22 | Polyic Gmbh & Co. Kg | Electronic circuit and method for producing such |
DE102005052928A1 (en) | 2005-11-03 | 2007-05-16 | Giesecke & Devrient Gmbh | See-through security element and method for its manufacture |
AU2006317160A1 (en) | 2005-11-22 | 2007-05-31 | Merck Patent Gmbh | Process for a thermal transfer of a liquid crystal film using a transfer element |
GB0525888D0 (en) | 2005-12-20 | 2006-02-01 | Rue De Int Ltd | Improvements in methods of manufacturing security substrates |
JP5158921B2 (en) | 2005-12-28 | 2013-03-06 | 日本発條株式会社 | Identification medium |
GB2438383B (en) | 2006-05-26 | 2008-10-08 | Rue De Int Ltd | Improvements in substrates |
GB2438384B (en) * | 2006-05-26 | 2008-10-29 | Rue De Int Ltd | Improvements in forming security devices |
CA2598007A1 (en) | 2006-08-29 | 2008-02-29 | Jds Uniphase Corporation | Printed article with special effect coating |
JP4900790B2 (en) | 2006-09-01 | 2012-03-21 | 日本発條株式会社 | Identification medium, article, identification device, and identification medium identification method |
GB2442711B (en) | 2006-10-10 | 2011-04-13 | Rue De Int Ltd | Improvements in security devices |
DE102007022437A1 (en) * | 2007-05-10 | 2008-11-13 | Leonhard Kurz Gmbh & Co. Kg | Process for producing a crosslinked liquid-crystal layer and device for carrying out the process |
DE102007034716A1 (en) | 2007-07-23 | 2009-01-29 | Giesecke & Devrient Gmbh | security element |
GB0720550D0 (en) | 2007-10-19 | 2007-11-28 | Rue De Int Ltd | Photonic crystal security device multiple optical effects |
GB2457911B (en) | 2008-02-27 | 2010-05-12 | Rue De Int Ltd | Improved method for producing an optically varible security device |
FR2933428B1 (en) * | 2008-07-03 | 2010-08-27 | Arjowiggins Licensing Sas | SECURITY ELEMENT WITH VARIABLE OPTICAL EFFECT AND SHEET OR SECURITY DOCUMENT OR ARTICLE COMPRISING SAME |
DE102008061608A1 (en) | 2008-12-11 | 2010-06-17 | Giesecke & Devrient Gmbh | security element |
DE102009016533A1 (en) * | 2009-04-06 | 2010-10-07 | Giesecke & Devrient Gmbh | Piezochrome safety element based on liquid crystal |
GB0906366D0 (en) | 2009-04-14 | 2009-05-20 | Rue De Int Ltd | Security device |
GB2474903B (en) | 2009-10-30 | 2012-02-01 | Rue De Int Ltd | Improvements in security devices |
GB2476228B (en) | 2009-11-19 | 2012-02-01 | Rue De Int Ltd | Improvements in security devices |
DE102012003601A1 (en) | 2012-02-21 | 2013-08-22 | Giesecke & Devrient Gmbh | Printing process with Passer between print and watermark |
IN2014MU03621A (en) | 2013-11-18 | 2015-10-09 | Jds Uniphase Corp | |
DE102015004072A1 (en) | 2015-03-30 | 2016-10-06 | Giesecke & Devrient Gmbh | Multicolored security element with effect colors |
GB2547236B (en) * | 2016-02-11 | 2019-09-11 | De La Rue Int Ltd | Improvements in security devices |
EP3959081A1 (en) * | 2019-04-20 | 2022-03-02 | Arrow Greentech Ltd | Robust colour shift security film with wide spectrum complex spectral values and security thread made therefrom |
Family Cites Families (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
AU488652B2 (en) * | 1973-09-26 | 1976-04-01 | Commonwealth Scientific And Industrial Research Organisation | Improvements in or relating to security tokens |
US4536014A (en) * | 1981-01-08 | 1985-08-20 | Securicard Systems Limited | Indentification of articles using liquid crystal identity cards |
DE3110048A1 (en) * | 1981-03-16 | 1982-09-30 | Consortium für elektrochemische Industrie GmbH, 8000 München | "COMPOSITIONS CONTAINING LIQUID CRYSTALLINE PHASES BASED ON CYCLIC ORGANOPOLYSILOXANS, THEIR PRODUCTION AND THEIR USE" |
DE3119459A1 (en) * | 1981-05-15 | 1982-12-09 | Consortium für elektrochemische Industrie GmbH, 8000 München | LIQUID-CRYSTALLINE PROPERTIES WITH CROSS-LINKED ORGANOPOLYSILOXANES |
CH653161A5 (en) * | 1981-10-27 | 1985-12-13 | Landis & Gyr Ag | DOCUMENT WITH A SECURITY CHARACTERISTIC AND METHOD FOR CHECKING THE DOCUMENT FOR AUTHENTICITY. |
JPS5988780A (en) * | 1982-11-08 | 1984-05-22 | アメリカン・バンク・ノ−ト・カムパニ− | Making of optical refraction recording body and optical refraction pattern |
DE3331515A1 (en) * | 1983-09-01 | 1985-03-21 | Merck Patent Gmbh, 6100 Darmstadt | TRIALKANOYLOXYSILANES |
-
1989
- 1989-12-22 DE DE3942663A patent/DE3942663A1/en not_active Withdrawn
-
1990
- 1990-12-05 EP EP90123341A patent/EP0435029B2/en not_active Expired - Lifetime
- 1990-12-05 AT AT90123341T patent/ATE126135T1/en not_active IP Right Cessation
- 1990-12-05 DE DE59009504T patent/DE59009504D1/en not_active Expired - Lifetime
- 1990-12-05 ES ES90123341T patent/ES2075871T5/en not_active Expired - Lifetime
- 1990-12-18 CA CA002032587A patent/CA2032587C/en not_active Expired - Fee Related
- 1990-12-21 JP JP40517890A patent/JP3244278B2/en not_active Expired - Fee Related
Cited By (20)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5678863A (en) * | 1992-07-24 | 1997-10-21 | Portals Limited | High value documents |
GB2276883A (en) * | 1993-04-05 | 1994-10-12 | Central Research Lab Ltd | Optical material containing a liquid crystal |
US5629055A (en) * | 1994-02-14 | 1997-05-13 | Pulp And Paper Research Institute Of Canada | Solidified liquid crystals of cellulose with optically variable properties |
US5851604A (en) * | 1994-05-06 | 1998-12-22 | Consortium Fur Elektrochemische Industrie Gmbh | Interference pigments comprising molecules fixed in a cholesteric configuration, and use thereof |
US6273473B1 (en) | 1996-10-10 | 2001-08-14 | Securency Pty Ltd | Self-verifying security documents |
US6467810B2 (en) | 1996-10-10 | 2002-10-22 | Securency Pty Ltd | Self-verifying security documents |
US6761377B2 (en) | 1996-10-10 | 2004-07-13 | Securency Pty Ltd | Self-verifying security documents |
US7040664B2 (en) | 1996-10-10 | 2006-05-09 | Securency Pty Ltd | Self-verifying security documents |
US7040663B1 (en) | 1999-02-23 | 2006-05-09 | Giesecke & Devrient, Gmbh | Value document |
EP1226308B2 (en) † | 1999-08-31 | 2012-11-14 | Giesecke & Devrient GmbH | Safety element and a valuable object |
US7386125B2 (en) | 2002-10-28 | 2008-06-10 | Qdesign Usa, Inc. | Techniques of imperceptibly altering the spectrum of a displayed image in a manner that discourages copying |
US7747015B2 (en) | 2002-10-28 | 2010-06-29 | Qdesign Usa, Inc. | Techniques of imperceptibly altering the spectrum of a displayed image in a manner that discourages copying |
US7728931B2 (en) | 2004-04-30 | 2010-06-01 | Giesecke & Devrient Gmbh | Security element and method for producing same |
US8968856B2 (en) | 2006-03-31 | 2015-03-03 | Giesecke & Devrient Gmbh | Security element and method for its production |
US8883273B2 (en) | 2006-08-10 | 2014-11-11 | De La Rue International Limited | Photonic crystal security device |
US8927072B2 (en) | 2006-08-10 | 2015-01-06 | De La Rue International Limited | Photonic crystal security device |
US8322753B2 (en) | 2006-11-22 | 2012-12-04 | Nhk Spring Co., Ltd. | Identification medium, identification method, and identification apparatus |
US8432589B2 (en) | 2007-05-21 | 2013-04-30 | Ovd Kinegram Ag | Multi-layer body having optical-action elements for producing an optical effect |
US8350259B2 (en) | 2008-05-30 | 2013-01-08 | Polyic Gmbh & Co. Kg | Electronic circuit |
CN102759441A (en) * | 2012-07-20 | 2012-10-31 | 西北工业大学 | Multiband polarization imaging anti-counterfeiting element identification system |
Also Published As
Publication number | Publication date |
---|---|
ES2075871T3 (en) | 1995-10-16 |
EP0435029B2 (en) | 2003-01-02 |
ES2075871T5 (en) | 2003-07-16 |
ATE126135T1 (en) | 1995-08-15 |
JP3244278B2 (en) | 2002-01-07 |
EP0435029A3 (en) | 1991-09-18 |
DE59009504D1 (en) | 1995-09-14 |
EP0435029A2 (en) | 1991-07-03 |
JPH04144796A (en) | 1992-05-19 |
EP0435029B1 (en) | 1995-08-09 |
CA2032587C (en) | 1996-07-09 |
DE3942663A1 (en) | 1991-06-27 |
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