Communications: electrical – Condition responsive indicating system – Specific condition
Reexamination Certificate
2011-06-28
2011-06-28
Wu, Daniel (Department: 2612)
Communications: electrical
Condition responsive indicating system
Specific condition
C340S572100, C340S572600, C340S551000, C340S552000
Reexamination Certificate
active
07969312
ABSTRACT:
The present invention relates to a device with its related electronic circuit and to a detection process targeted to detect any magnetic material moving around the antennas/sensors used in Electronic Article Surveillance (EAS) electromagnetic systems, which can be internally or externally coupled to these kind of anti-theft systems, significantly decreasing its current vulnerability to fraud since the current EAS electromagnetic systems are vulnerable for not being able to detect magnetic materials. The present process and detector device filter and treat the DC signal generated by the displacement of a magnetic material around one or more EAS electromagnetic system antenna/sensor(s). Magnetic material detection is achieved from a differential signal existing in the antenna/sensor receiver, such signal being forwarded to a control unit wherein there are coupled a device comprising a “n” order filter, a buffer, a sensitivity control circuit, a control logic and an alarm module.
REFERENCES:
patent: 3983552 (1976-09-01), Bakeman, Jr. et al.
patent: 4539558 (1985-09-01), Fearon
patent: 5414410 (1995-05-01), Davies et al.
patent: 5748086 (1998-05-01), Bettine et al.
patent: 6909368 (2005-06-01), Sumi et al.
patent: 7075427 (2006-07-01), Pace et al.
patent: 2002/0158764 (2002-10-01), Conway
patent: 2003/0210145 (2003-11-01), Manov et al.
patent: 2005/0151535 (2005-07-01), Hagino et al.
patent: 2006/0003730 (2006-01-01), Elder et al.
patent: 2006/0143899 (2006-07-01), Tuttle et al.
patent: 2007/0046334 (2007-03-01), Hairapetian
patent: 2010/0001872 (2010-01-01), Lian et al.
patent: 1 416 300 (2004-05-01), None
patent: WO 90/03623 (1990-04-01), None
Alston & Bird LLP
Ma Kam
Wu Daniel
LandOfFree
Device and process for magnetic material detection in... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Device and process for magnetic material detection in..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Device and process for magnetic material detection in... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2649455