US3838418A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pest control apparatus and method
Assignee: Individual
•
Filing: 1972-06-26
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Granted: 1974-09-24
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Expires: 1992-06-26
Abstract
Abstract A pest control apparatus and method for dispersing pests, e.g., rodents, from a designated area by the transmission into the area of high intensity ultrasonic sound waves having a primary frequency varying as a function of time and frequency modulating the sound waves with a secondary vibrato. The apparatus additionally provides periodic bursts of such ultrasonic power affording transducer rest periods maximizing the power handling capability of the transducer during ''''on'''' periods.
Inventors
- 👤 C Brown
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 13:56
CPC Classifications
G; G10; G10K; G10K15/00; G10K15/02; A; A01; A01M; A01M29/00; A01M29/16; A01M29/18
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
123 words
In a pest control apparatus having a tone generator providing an output frequency as a function of applied voltage and a transducer connected to the output of said generator, the improvement comprising: generator means providing an interrupted slope sawtooth output connected to the input of said tone generator, the periodically repeating sawtooth ramps each comprising contiguous segments alternately of constant and sloping amplitudes and providing successive tone generator outputs of substantially constant and of continuously changing frequency respectively; and gating means connected to the output of said tone generator and to said generator means and chopping said tone generator output in synchronism with said segments and selectively passing only tone generator outputs of changing frequency and providing interspersed tone generator output rest periods.
Claim 2
Dependent Claim
123 words
In a pest control apparatus having a tone generator providing an output frequency as a function of applied voltage and a transducer connected to the output of said generator, the improvement comprising: generator means providing an interrupted slope sawtooth output connected to the input of said tone generator, the periodically repeating sawtooth ramps each comprising contiguous segments alternately of constant and sloping amplitudes and providing successive tone generator outputs of substantially constant and of continuously changing frequency respectively; and gating means connected to the output of said tone generator and to said generator means and chopping said tone generator output in synchronism with said segments and selectively passing only tone generator outputs of changing frequency and providing interspersed tone generator output rest periods.
Claim 3
Dependent Claim
56 words
An apparatus as defined in claim 1, and a D.C. amplifier having input and output terminals connected to the output of said sawtooth generator means and the input of said tone generator respectively, said amplifier having offset and gain controls determining the center frequency and the frequency range respectively of the output of said tone generator.
Claim 4
Dependent Claim
14 words
An apparatus as defined in claim 2, said segments being of substantially equal duration.
Claim 5
Dependent Claim
51 words
An apparatus as defined in claim 2, said amplifier having a second input terminal and functioning to mix the signal therefrom with the signal impressed on said first named input terminal; and a random noise generator connected to said second input terminal and providing a random vibrato signal to said transducer.
Claim 6
Dependent Claim
36 words
An apparatus as defined in claim 4, said last named generator comprising a random white noise source; and a filter connected between said noise generator and said second input terminal for optimizing the coefficient of annoyance.
Claim 7
Dependent Claim
18 words
An apparatus as defined in claim 4, said filter passing signals having frequencies up to about 200 Hz.
Claim 8
Dependent Claim
23 words
An apparatus as defined in claim 6, and signal amplitude clipping means connected between said random noise generator and said second input terminal.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-09-23 | 1978-03-25 | 1978-09-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-09-23 | 1982-03-25 | 1982-09-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-09-23 | 1986-03-25 | 1986-09-24 | $7700.00 | Window Closed / Lapsed |