Communications – electrical: acoustic wave systems and devices – Transmitter systems – Animal control
Patent
1997-12-19
2000-11-21
Lobo, Ian J.
Communications, electrical: acoustic wave systems and devices
Transmitter systems
Animal control
119721, 119908, 3405733, H04B 1300, A01K 1504
Patent
active
061512761
ABSTRACT:
An echo-ranging boundary system is provided for controlling the access of animals to predefined areas. An electronic transponder collar is affixed to an animal for exclusion from a predefined area. An ultrasonic beacon, defining a transmission reference point, periodically transmits a directional ultrasonic interrogation signal for determining the location of animals provided with transponder collars. The transponder collar emits an ultrasonic reply signal, detected by the station after a period of time defined by the propagation delay of the ultrasonic reply signal. The propagation delay of the reply signal is directly proportional to the distance between the transponder and the interrogation signal reference point. A timing threshold is set at the transmission station corresponding to a desired control distance. Reply signals returned before a device time-out are compared to the timing threshold. If the elapsed time of the propagated reply signal is less than the user selected threshold a correction pulse is transmitted to the animal transponder collar.
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Ried, Katie, "My Cat is Special To Me, But There Are Some Places I Don't Want Her To Go!", Technology Update, publication date unknown.
"Now You Can Keep Pets Off Furniture, Cars, Food Areas and Plants!"--Radio Fence--Indoor Containment Systems Website (www.radiofence.com/indoor.htm), publication date unknown.
IFCO Enterprises, Inc.
Lobo Ian J.
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