EP 1744903 B2 20161102 - SECURITY ELEMENT AND METHOD FOR PRODUCING SAME
Title (en)
SECURITY ELEMENT AND METHOD FOR PRODUCING SAME
Title (de)
SICHERHEITSELEMENT UND VERFAHREN ZU SEINER HERSTELLUNG
Title (fr)
ELEMENT DE SECURITE ET PROCEDE POUR SA PRODUCTION
Publication
Application
Priority
- EP 2005004683 W 20050429
- DE 102004021246 A 20040430
Abstract (en)
[origin: US2007216518A1] The present invention relates to a security element ( 30 ) for securing valuable articles, having a first optically active layer ( 32 ) that is present at least in some areas and comprises a cholesteric liquid crystal material. According to the present invention, a second optically active layer ( 34 ) that is present at least in some areas is provided, the first and the second layer ( 32, 34 ) being stacked in an overlap area. Here, the first optically active layer ( 32 ) selectively reflects light in a first wavelength range having a first circular polarization direction, and the second optically active layer ( 34 ), either itself or, in the overlap area, in coaction with the first optically active layer ( 32 ), selectively reflects light in a second wavelength range having a second direction of circular polarization.
IPC 8 full level
B42D 25/29 (2014.01); B32B 27/36 (2006.01); B42D 15/00 (2006.01); B42D 15/10 (2006.01); B42D 25/364 (2014.01); G02F 1/1337 (2006.01); G06K 19/06 (2006.01); G07D 7/12 (2016.01)
CPC (source: EP US)
B42D 25/00 (2014.10 - EP US); B42D 25/29 (2014.10 - EP US); B42D 25/364 (2014.10 - US); B42D 25/391 (2014.10 - EP US); G07D 7/1205 (2017.04 - EP US); B42D 2033/26 (2022.01 - EP); Y10T 428/2969 (2015.01 - EP US)
Citation (opposition)
Opponent :
EP 0601483 A1 19940615 - CONSORTIUM ELEKTROCHEM IND [DE]
Designated contracting state (EPC)
AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IS IT LI LT LU MC NL PL PT RO SE SI SK TR
DOCDB simple family (publication)
US 2007216518 A1 20070920; US 7728931 B2 20100601; AT E424311 T1 20090315; AT E516154 T1 20110715; AT E554944 T1 20120515; CN 100522647 C 20090805; CN 1950217 A 20070418; CN 1950217 B 20100512; CN 1956852 A 20070502; DE 102004021246 A1 20051124; DE 502005006752 D1 20090416; EP 1744903 A2 20070124; EP 1744903 B1 20090304; EP 1744903 B2 20161102; EP 1744903 B9 20170315; EP 2065214 A1 20090603; EP 2065214 B1 20110713; EP 2065215 A1 20090603; EP 2065215 B1 20120425; RU 2006141701 A 20080610; RU 2377132 C2 20091227; WO 2005105474 A2 20051110; WO 2005105474 A3 20060406
DOCDB simple family (application)
US 56830205 A 20050429; AT 05743575 T 20050429; AT 09002798 T 20050429; AT 09002799 T 20050429; CN 200580013681 A 20050429; CN 200580013683 A 20050429; DE 102004021246 A 20040430; DE 502005006752 T 20050429; EP 05743575 A 20050429; EP 09002798 A 20050429; EP 09002799 A 20050429; EP 2005004683 W 20050429; RU 2006141701 A 20050429