Communications – electrical: acoustic wave systems and devices – Transmitter systems – Animal control
Patent
1977-10-11
1979-12-11
Blum, Theodore M.
Communications, electrical: acoustic wave systems and devices
Transmitter systems
Animal control
43124, H04B 1100
Patent
active
041785789
ABSTRACT:
Ultrasonic pest control apparatus comprising a pair of transducers, one in the form of a ring and the other in the form of a disc positioned within the ring, carried by a housing, a pair of oscillators operatively connected to the transducers, a timer controlling the oscillators, and a reflector extending from the housing. The oscillators apply to the transducers electrical signals having frequencies different from the natural frequencies of the transducers, and the timer controls the oscillator duty cycle. The generated sound waves are a composite output in the form of a random pattern of harmonics in the ultrasonic frequency range noramlly inaudible to humans and intolerable by pests such as rodents. A system includes a pair of units in opposed alignment whereby sound waves of one unit work against sound waves of the other. A gas-tight sealing arrangement associated with transducer and housing permits safe operation in explosive atmospheres. The transducers, oscillators and timer are removable as a unit from the housing which is frusto-conical in shape permitting a plurality of units to be nested during storage and shipment.
REFERENCES:
patent: 3328908 (1967-07-01), Moe
patent: 3517226 (1970-06-01), Jones, Sr.
patent: 3636559 (1972-01-01), Grande et al.
patent: 3872472 (1975-03-01), Moschgat
patent: 3879702 (1975-04-01), Mancone
Blum Theodore M.
Hall Gary Lester
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