EP 0435029 B2 20030102 - Data carrier with a liquid crystal security element
Title (en)
Data carrier with a liquid crystal security element
Title (de)
Datenträger mit einem Flüssigkristall-Sicherheitselement
Title (fr)
Support d'information avec élément de sécurité à cristaux liquides
Publication
Application
Priority
DE 3942663 A 19891222
Abstract (en)
[origin: EP0435029A2] Data carriers protected against forgery attempts using colour copiers, such as an identity card or a security, which include an optically variable security element of a liquid crystal material. This security element, such as for example a security thread, has a layer similar to plastic of a liquid crystal polymer, which exhibits a pronounced iridescence at room temperature. The plastic-like properties of the liquid crystal polymers permit easy processing to form a semi-finished or finished product, so that very diverse types of security elements can be produced. <IMAGE>
IPC 1-7
IPC 8 full level
B42D 15/10 (2006.01); B42D 25/00 (2014.01); B42D 25/355 (2014.01); B44F 1/02 (2006.01); B44F 1/12 (2006.01); G07F 7/08 (2006.01)
CPC (source: EP US)
B42D 25/00 (2014.10 - EP); B42D 25/355 (2014.10 - EP); B42D 25/364 (2014.10 - US); G07F 7/086 (2013.01 - EP); B42D 2033/26 (2022.01 - EP)
Designated contracting state (EPC)
AT BE CH DE ES FR GB IT LI LU NL SE
DOCDB simple family (publication)
EP 0435029 A2 19910703; EP 0435029 A3 19910918; EP 0435029 B1 19950809; EP 0435029 B2 20030102; AT E126135 T1 19950815; CA 2032587 A1 19910623; CA 2032587 C 19960709; DE 3942663 A1 19910627; DE 59009504 D1 19950914; ES 2075871 T3 19951016; ES 2075871 T5 20030716; JP 3244278 B2 20020107; JP H04144796 A 19920519
DOCDB simple family (application)
EP 90123341 A 19901205; AT 90123341 T 19901205; CA 2032587 A 19901218; DE 3942663 A 19891222; DE 59009504 T 19901205; ES 90123341 T 19901205; JP 40517890 A 19901221