专利名称：Coding articles发明人：Andrew Nicholas Dames申请号：US09685251申请日：20001010公开号：US06373388B1公开日：20020416
专利附图：
摘要：Magnetic tags or markers are disclosed, together with a variety of techniquesby means of which such tags may be interrogated. In one aspect, the magnetic marker ortag which is characterised by carrying a plurality of discrete magnetically active regions ina linear array. In another aspect, the invention provides a method of interrogating a
magnetic tag or marker within a predetermined interrogation zone, the tag comprising ahigh permeability magnetic material, for example to read data stored magnetically in thetag or to use the response of the tag to detect its presence and/or to determine itsposition within the interrogation zone, characterized in that the interrogation processincludes the step of subjecting the tag sequentially to: (1) a magnetic field sufficient infield strength to saturate the high permeability magnetic material, and (2) a magnetic nullas herein defined. Applications of such techniques are described, inter alia, in relation to(a) identifying articles to which tags are attached; (b) accurate determination of position,as in the location of surgical probes; and (c) totalisation of purchases, where each itemcarries a tag coded with data representing its nature and its price.
申请人：FLYING NULL LIMITED
代理机构：Oppenheimer Wolff & Donnelly, LLP
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