Electronic article surveillance markers for optically recorded media

Number of patents in Portfolio can not be more than 2000

United States of America Patent

PATENT NO 6525661
APP PUB NO 20020140556A1
SERIAL NO

09258460

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ATTORNEY / AGENT: (SPONSORED)

Importance

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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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First Claim

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Patent Owner(s)

Patent OwnerAddressTotal Patents
3M INNOVATIVE PROPERTIES COMPANYST PAUL, MN8719
Minnesota Mining and Manufacturing CompanyST PAUL, MN2022

International Classification(s)

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Tsai, Ching-Long Woodbury, MN 23 1057

Cited Art Landscape

Patent Info (Count) # Cites Year
 
Minnesota Mining and Manufacturing Company (9)
4710754 Magnetic marker having switching section for use in electronic article surveillance systems 52 1986
* 4746908 Dual-status, magnetically imagable article surveillance marker 42 1986
* 4829288 Economic, multi-directionally responsive marker for use in electronic article surveillance systems 17 1987
4825197 Dual status magnetic marker having magnetically biasable flux collectors for us in electronic article surveillance systems 12 1988
4884063 Dual status magnetic marker having magnetically biasable flux collectors for use in electronic article surveillance systems 4 1989
4967185 Multi-directionally responsive, dual-status, magnetic article surveillance marker having continuous keeper 81 1989
5347508 Optical information storage disk for use with electronic article surveillance systems 48 1992
* 5432499 Collector type article surveillance marker with continuous keeper 13 1993
* 5580664 Dual status thin-film eas marker having multiple magnetic layers 16 1995
 
BIBLIOTHECA RFID LIBRARY SYSTEMS AG (4)
5699047 Electronic article surveillance markers for direct application to optically recorded media 26 1996
5825292 Electronic article surveillance markers for direct application to optically recorded media 16 1997
* 5939985 Electronic article surveillance markers for direct application to optically recorded media 15 1998
* 6097291 Electronic article surveillance markers for direct application to optically recorded media 32 1999
 
SENSORMATIC ELECTRONICS CORPORATION (1)
* 6023226 EAS marker with flux concentrators having magnetic anisotropy oriented transversely to length of active element 3 1998
 
Pitney Bowes Inc. (1)
5121106 Electronic article surveillance markers with diagonal deactivation elements 10 1990
 
TYCO FIRE & SECURITY GMBH (1)
* 5835016 Multi-thread re-entrant marker with transverse anisotropy flux concentrators 9 1997
* Cited By Examiner

Patent Citation Ranking

Forward Cite Landscape

Patent Info (Count) # Cites Year
 
DELUXE MEDIA SERVICES LLC (1)
* 6947371 Secure optical information disc 18 2004
 
METGLAS, INC. (1)
* 6693542 Electronic article surveillance markers for recorded media 7 2001
 
Vidco, Inc. (5)
* 2004/0228,262 Secure optical information disc 1 2004
7187645 Secure optical information disc having a minimized metal layer 2 2005
7411893 Secure optical information disc 0 2007
* 2007/0147,224 SECURE OPTICAL INFORMATION DISC 1 2007
* 2009/0016,187 SECURE OPTICAL INFORMATION DISC HAVING A MINIMIZED METAL LAYER 0 2007
* Cited By Examiner