EP 0412137 B1 19940511 - MAGNETIC MATERIALS FOR SECURITY APPLICATIONS.
Title (en)
MAGNETIC MATERIALS FOR SECURITY APPLICATIONS.
Title (de)
MAGNETISCHE MATERIALIEN FÜR SICHERHEITSANWENDUNGEN.
Title (fr)
MATERIAUX MAGNETIQUES DE SECURITE.
Publication
Application
Priority
- GB 8900398 A 19890109
- GB 9000024 W 19900109
Abstract (en)
[origin: WO9007784A1] A tag or marker is disclosed which comprises a substrate; an 'active' magnetic material which is a soft magnetic material having a high magnetic permeability and a low coercive force; and a deactivating material which is a hard or semi-hard magnetic material having a moderate or high coercive force and a moderate magnetic permeability, whereby the deactivating material, when subjected to a sufficiently high magnetising force, is able to clamp the magnetic properties of the 'active' material so as to deactivate the 'active' material. The tag or marker is characterised in that at least one of said 'active' material and said deactivating material is formed by an electrodeposition process. In another aspect, the deactivating material is formed from a steel containing 0.15 % carbon, 16-18 % chromium, and 6-8 % nickel, the balance being iron.
IPC 1-7
IPC 8 full level
H01F 41/24 (2006.01); G08B 13/24 (2006.01); H01F 10/14 (2006.01); H01F 41/26 (2006.01)
IPC 8 main group level
H01F (2006.01)
CPC (source: EP)
G08B 13/2411 (2013.01); G08B 13/2417 (2013.01); G08B 13/2437 (2013.01); G08B 13/2442 (2013.01); H01F 41/26 (2013.01)
Citation (examination)
WO 8802538 A1 19880407 - UNIV TORONTO [CA], et al
Designated contracting state (EPC)
AT BE CH DE DK ES FR GB IT LI LU NL SE
DOCDB simple family (publication)
WO 9007784 A1 19900712; AT E105649 T1 19940515; AU 4824890 A 19900801; AU 620198 B2 19920213; BR 9004571 A 19910730; CA 2024608 A1 19900710; CA 2024608 C 19970819; DE 69008789 D1 19940616; DE 69008789 T2 19941124; DK 0412137 T3 19940606; EP 0412137 A1 19910213; EP 0412137 B1 19940511; GB 8900398 D0 19890308; JP 2582942 B2 19970219; JP H03504183 A 19910912; NO 903875 D0 19900905; NO 903875 L 19900905
DOCDB simple family (application)
GB 9000024 W 19900109; AT 90901612 T 19900109; AU 4824890 A 19900109; BR 9004571 A 19900109; CA 2024608 A 19900109; DE 69008789 T 19900109; DK 90901612 T 19900109; EP 90901612 A 19900109; GB 8900398 A 19890109; JP 50178590 A 19900109; NO 903875 A 19900905