Communications: electrical – Selective – Interrogation response
Reexamination Certificate
2006-04-18
2006-04-18
Zimmerman, Brian (Department: 2635)
Communications: electrical
Selective
Interrogation response
C341S178000, C341S179000, C714S799000, C714S823000
Reexamination Certificate
active
07030731
ABSTRACT:
Monitoring systems and protocols are disclosed that are flexible in mode operation and format depending on the environment in which they are used. Such monitoring systems and protocols are able to change their utilization automatically, or by received instruction to do so. A location detection system includes one or more low frequency transmitters, one or more radio frequency monitoring tags and one or more receiving devices. The low frequency transmitter transmits location identification information, such as the transmitter ID, to a tag in the vicinity of the transmission. The tag relays the transmitter ID using a higher frequency transmission sent from the tag to the receiver. Communication protocols are disclosed that enable deciphering of multiple tag transmissions starting simultaneously.
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Derwent abstract of EP 108094B (publication date: Oct. 14, 1987).
Fowler William
Freiwald Dean
Lastinger Roc
Rodgers James
Moss Allen J.
RF Code, Inc.
Squire Sanders & Dempsey L.L.P.
Yang Clara
Zimmerman Brian
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