Global Patent Index - EP 1452338 A1

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

EP 1452338 A1 20040901 (EN)

Application

EP 03004494 A 20030228

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

B42D 15/10; B41M 3/14; D21H 21/48

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)

  • [A] WO 0019016 A1 20000406 - ETHZ INST FUER POLYMERE [CH], et al
  • [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
  • [A] KWANG-DUK AHN ET AL.: "A novel precursor for color and fluorescent imaging", CHEMISTRY OF MATERIALS, vol. 10, 1998, pages 2332 - 2334, XP002249830
  • [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)

EP 1452338 A1 20040901

DOCDB simple family (application)

EP 03004494 A 20030228