EP 0628936 A1 19941214 - Multidirectional surveillance marker.
Title (en)
Multidirectional surveillance marker.
Title (de)
Multirichtungsempfindliches Etikett für die Warenüberwachung.
Title (fr)
Marqueur à sensibilité multi-directionnelle pour la surveillance d'articles.
Publication
Application
Priority
US 7624793 A 19930611
Abstract (en)
A marker (10) to be used in article surveillance systems of the type which employ alternating magnetic interrogating fields. The marker comprises a closed loop band of material having high magnetic permeability and low magnetic coercivity; and it has cutouts (12) distributed along its length to form thin strips (10a,10b) of the marker material to increase the effective length to cross section ratio. <IMAGE>
IPC 1-7
IPC 8 full level
G01V 3/00 (2006.01); G01V 15/00 (2006.01); G08B 13/24 (2006.01); H01F 1/14 (2006.01)
CPC (source: EP)
G08B 13/2408 (2013.01); G08B 13/2437 (2013.01); G08B 13/2442 (2013.01)
Citation (search report)
- [Y] EP 0412721 A2 19910213 - MINNESOTA MINING & MFG [US]
- [Y] US 4967184 A 19901030 - REGELSBERGER MATTHIAS H [US]
- [A] US 4910625 A 19900320 - ALBRECHT FREDERICK X [US], et al
- [A] EP 0260830 A2 19880323 - MINNESOTA MINING & MFG [US]
- [A] EP 0260831 A2 19880323 - MINNESOTA MINING & MFG [US]
- [A] "article surveillance apparatus and systems for computer data disks", RESEARCH DISCLOSURE, no. 304, August 1989 (1989-08-01), NEW YORK, US, pages 617
Designated contracting state (EPC)
BE DE DK FR GB IT NL SE
DOCDB simple family (publication)
DE 9407703 U1 19940901; AU 6068394 A 19941215; AU 667431 B2 19960321; BR 9402136 A 19950117; DE 69423135 D1 20000406; DE 69423135 T2 20000928; EP 0628936 A1 19941214; EP 0628936 B1 20000301; JP 2500309 B2 19960529; JP H0798791 A 19950411
DOCDB simple family (application)
DE 9407703 U 19940509; AU 6068394 A 19940426; BR 9402136 A 19940531; DE 69423135 T 19940509; EP 94107232 A 19940509; JP 12889194 A 19940610