EP 1452338 A1 20040901 - Patterned dichroic security features
Title (en)
Patterned dichroic security features
Title (de)
Gemustertes dichroisches Sicherheitskennzeichen
Title (fr)
Caractéristiques de sécurité dichroiques à motifs
Publication
Application
Priority
EP 03004494 A 20030228
Abstract (en)
A novel security item is proposed which is characterised by at least one security element having at least one segment comprising at least one latent VIS absorber with linearly polarized absorption and/or linearly polarized emission. Such a security item can be used to generate spatially resolved areas of different colour in the visible spectral range in combination with linear polarisation, providing a very effective means for protecting documents like banknotes, identification cards, credit cards, and the like.
IPC 1-7
IPC 8 full level
B41M 3/14 (2006.01); B42D 15/10 (2006.01); D21H 21/48 (2006.01)
CPC (source: EP US)
B41M 3/14 (2013.01 - EP US); B42D 25/00 (2014.10 - EP); B42D 25/20 (2014.10 - US); D21H 21/48 (2013.01 - EP US)
Citation (search report)
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- [A] US 5879855 A 19990309 - SCHAEDELI ULRICH [CH], et al
- [A] US 4826976 A 19890502 - BORROR ALAN L [US], et al
- [A] WO 9637369 A1 19961128 - BICC PLC [GB], et al
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- [A] KWANG-DUK AHN ET AL.: "Synthesis of and fluorescent imaging with a polymer having t-BOC protected Quinizarin moieties", ADVANCED MATERIALS, vol. 11, no. 18, 1999, pages 1499 - 1502, XP000902379
- [A] CHRISTOPH WEDER ET AL.: "Aromatic 2-(2'-hydroxyphenyl)benzoxazole esters: a novel class of caged photoluminescent dyes", JOURNAL OF MATERIALS CHEMISTRY, vol. 12, 2002, pages 2620 - 2626, XP009014878
- [AD] CHRISTOPK KOCHER ET AL.: ""Latent" ultraviolet light absorbers", JOURNAL OF MATERIALS CHEMISTRY, vol. 13, 15 November 2002 (2002-11-15), pages 9 - 15, XP002249831
- [A] JOHN S. ZAMBOUNIS ET AL.: "Latent pigments activated by heat", NATURE, vol. 388, 10 July 1997 (1997-07-10), pages 131 - 132, XP002249832
Designated contracting state (EPC)
AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IT LI LU MC NL PT SE SI SK TR
DOCDB simple family (publication)
DOCDB simple family (application)
EP 03004494 A 20030228