US Patent Application No: 2002/0140,556

Number of patents in Portfolio can not be more than 2000

ELECTRONIC ARTICLE SURVEILLANCE MARKERS FOR OPTICALLY RECORDED MEDIA

ALSO PUBLISHED AS: 6525661

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ATTORNEY / AGENT: (SPONSORED)

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Abstract

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An electronic article surveillance marker is disclosed, including a signal producing layer and a signal blocking layer. The signal producing layer includes flux collection portions joined by magnetic switching sections each having a major axis A, and the signal blocking layer comprises signal blocking elements overlying each flux collection portion. The elements each have at least one boundary that overlies a magnetic switching section and preferably has a tangent T that is not perpendicular to the major axis A of that magnetic switching section. Methods of making the inventive marker are also disclosed.

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Patent Owner(s)

Patent OwnerAddressTotal Patents
3M INNOVATIVE PROPERTIES COMPANYST PAUL, MN7567
MINNESOTA MINING AND MANUFACTURING COMPANYST PAUL, MN2041

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Tsai, Ching Long - 5 118

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Patent Info (Count) # Cites Year
 
Other [Check patent profile for assignment information] (1)
* 6,614,750 Optical recordable disk security system 19 2001
* Cited By Examiner