MAGNETIC MATERIALS FOR SECURITY APPLICATIONS

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 coerc...

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1. Verfasser:	DAVIES, DAFYDD GERAINT
Format:	Patent
Sprache:	eng ; fre
Schlagworte:	ALARM SYSTEMS BASIC ELECTRIC ELEMENTS ELECTRICITY INDUCTANCES MAGNETS ORDER TELEGRAPHS PHYSICS SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES SIGNALLING SIGNALLING OR CALLING SYSTEMS TRANSFORMERS
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creator	DAVIES, DAFYDD GERAINT
description	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.
format	Patent
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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. 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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. 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language	eng ; fre
recordid	cdi_epo_espacenet_CA2024608C
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subjects	ALARM SYSTEMS BASIC ELECTRIC ELEMENTS ELECTRICITY INDUCTANCES MAGNETS ORDER TELEGRAPHS PHYSICS SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES SIGNALLING SIGNALLING OR CALLING SYSTEMS TRANSFORMERS
title	MAGNETIC MATERIALS FOR SECURITY APPLICATIONS
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