Communications: electrical – Condition responsive indicating system – Specific condition
Reexamination Certificate
2006-11-28
2006-11-28
Mullen, Thomas (Department: 2612)
Communications: electrical
Condition responsive indicating system
Specific condition
C235S385000, C340S010100, C340S326000, C340S505000, C340S539210, C340S539320, C340S691300, C340S691500
Reexamination Certificate
active
07142120
ABSTRACT:
Methods and apparatus are provided for locating one among many items equipped with RFID tags. The apparatus comprises a portable system interrogating the RFID tags and receiving responses therefrom that depend at least on their bearing angle. A comparator selects responses from the one item and ignores others. An annunciator indicates the presence of the one item in the interrogator field of view and, desirably but not essentially, its relative proximity. A directional antenna whose beam pattern is limited in azimuth and/or elevation provides bearing angle information. Its field of view becomes progressively smaller as the antenna approaches the one item so that a user can substantially pinpoint its location without needing any of the usual RFID infrastructure. Tag response hit rate and/or signal strength provides range related information to the interrogator. Optionally, the presence of each new tag is announced until all new tags have been identified.
REFERENCES:
patent: 5528232 (1996-06-01), Verma et al.
patent: 5565858 (1996-10-01), Guthrie
patent: 5963134 (1999-10-01), Bowers et al.
patent: 6232870 (2001-05-01), Garber et al.
patent: 2003/0034887 (2003-02-01), Crabtree et al.
patent: 2003/0141973 (2003-07-01), Yeh et al.
patent: 2004/0217859 (2004-11-01), Pucci et al.
Bridgelall Raj
Charych Hal
Malik Sumita
O'Haire Michael
Ingrassia Fisher & Lorenz P.C.
Mullen Thomas
Symbol Technologies Inc.
LandOfFree
Item finding using RF signalling does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Item finding using RF signalling, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Item finding using RF signalling will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3695915