Title:
METHOD FOR PRODUCING A SECURITY DOCUMENT
Document Type and Number:
WIPO Patent Application WO2002038863
Kind Code:
A3
Abstract:
The invention concerns a method for producing a security document having an opaque fibrous texture, so as to constitute on the surface of the document at least a highly transparent zone. The invention is characterised in that the method comprises a local treatment of the fibrous texture of the document in said zone, so as to enhance its transparency, and the method comprises the exposure of the locally treated zone to the vibration of a sonotrode at an ultrasonic frequency.
Inventors:
DUMERY THIERRY (FR)
VIEU CHRISTIAN (FR)
GRIMAL JEAN-MICHEL (FR)
VIEU CHRISTIAN (FR)
GRIMAL JEAN-MICHEL (FR)
Application Number:
PCT/FR2001/003490
Publication Date:
August 15, 2002
Filing Date:
November 09, 2001
Export Citation:
Assignee:
BANQUE DE FRANCE (FR)
DUMERY THIERRY (FR)
VIEU CHRISTIAN (FR)
GRIMAL JEAN-MICHEL (FR)
DUMERY THIERRY (FR)
VIEU CHRISTIAN (FR)
GRIMAL JEAN-MICHEL (FR)
International Classes:
D21F1/44; D21H21/26; D21H21/40; D21H25/06; (IPC1-7): D21H21/26; D21F11/00; D21H25/06
Domestic Patent References:
| WO1994020679A1 | 1994-09-15 |
Foreign References:
| FR2768443A1 | 1999-03-19 | |||
| EP0549384A1 | 1993-06-30 | |||
| US1946338A | 1934-02-06 | |||
| US6143120A | 2000-11-07 |
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