EP 0328320 A1 19890816 - Security device.
Title (en)
Security device.
Title (de)
Sicherheitsvorrichtung.
Title (fr)
Moyen de sécurité.
Publication
Application
Priority
GB 8802590 A 19880205
Abstract (en)
One or more threads of a photochromic yarn are used as a security device in woven material, for example a label (1). The threads are substantially colourless when irradiated with visible light but are reversibly converted to a coloured state (2) when irradiated with ultraviolet light.
IPC 1-7
IPC 8 full level
D06H 1/00 (2006.01); D06Q 1/00 (2006.01); G09F 3/02 (2006.01)
CPC (source: EP)
D06H 1/00 (2013.01); D06Q 1/00 (2013.01); G09F 3/0294 (2013.01)
Citation (search report)
- [YD] GB 1600615 A 19811021 - PLESSEY CO LTD
- [XD] FR 1588282 A 19700410
- [A] GB 423281 A 19350129 - OSKAR CAMILLO RECHT
- [Y] EP 0169750 A1 19860129 - JALON MICHEL
- [AD] WPIL FILE SUPPLIER, no. 86-249926/38, Derwent Publications Ltd, London, GB; & JP-A61 179 399 (OKURASHO INSATSU KY) 12-08-1986
Designated contracting state (EPC)
AT BE CH DE ES FR GB GR IT LI LU NL SE
DOCDB simple family (publication)
DOCDB simple family (application)
EP 89301071 A 19890203; GB 8802590 A 19880205