Rodent control apparatus and method

Details Rodent control apparatus and method Rodent control apparatus and method

1980-08-18

1982-07-06

Caldwell, Sr., John W.

Communications: electrical

Audible indication

Ultrasonic pest control

340384R, G08B 310

Patent

active

043385931

ABSTRACT:
Apparatus and method for producing ultrasonic sound waves used to disperse rodents including negative feedback damping of a tuned band-pass filter output circuit. An electrical signal is frequency modulated, amplitude modulated asynchronously with the frequency modulation, pulsed on and off and applied to a speaker to produce ultrasonic sound waves corresponding thereto. The output signal is passed through a tuned band-pass filter circuit which includes negative feedback damping to reduce the power consumption of the amplification of the output signal and in part to produce the band-pass characteristics of the band-pass filter output circuit.

REFERENCES:
patent: 3594786 (1971-07-01), Brunner et al.
patent: 3636559 (1972-01-01), Del Grande et al.
patent: 3838418 (1974-09-01), Brown
patent: 3872472 (1975-03-01), Moschgat
patent: 3873960 (1975-03-01), Gates, Sr.
patent: 3893106 (1975-07-01), Schulein
patent: 4001817 (1977-01-01), Squires
patent: 4186387 (1980-01-01), Moschgat

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