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NTIS 바로가기국가/구분 | United States(US) Patent 등록 |
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국제특허분류(IPC7판) |
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출원번호 | US-0578215 (1975-05-16) |
발명자 / 주소 |
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출원인 / 주소 |
|
인용정보 | 피인용 횟수 : 25 인용 특허 : 0 |
A system for teaching a pet, such as a dog, not to wander beyond a predetermined distance includes a dog whistle triggered by an ultrasonic ranging system. An ultrasonic pulse transmitter worn by the master produces a repetitive signal at a first superaudible frequency which is repeated by an ultras
An animal training system responsive to the distance between an animal and a master location comprising: a first housing adapted to be positioned at said master location, transmitter means and receiver means in said first housing, and means in said first housing responsive to the time delay between
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