Patent US3886492A successfully refreshed from Google Patents.
US3886492A
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US
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Sonic insect repeller
Assignee: JOHN JOSEPH SZMIGIELSKI
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Filing: 1972-10-10
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Granted: 1975-05-27
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Expires: 1992-10-10
Abstract
Abstract An electronic sound generator generates a wide range of sound frequencies which will repel insects from the area where the sound frequencies are prevalent, and with production of said frequencies maintained at sound power levels and tonal qualities which are offensive to selected insects but which are not dangerous or offensive to animals or humans. The sound is generated by means of a unijunction sawtooth oscillator and a crystal ceramic transducer. The oscillator employs the unijunction transistors to generate a sawtooth waveform, the frequency of which is varied or swept over a selected range. In addition, the sawtooth generated by the unijunction produces high frequency noise at its peaks which results in a broad frequency spectrum being produced ranging from about 10 kilohertz up to about 150 kilohertz.
Inventors
- 👤 Herbert Montgomery White
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 19:10
CPC Classifications
A; A01; A01M; A01M29/00; A01M29/16; A01M29/18; H; H03; H03K; H03K4/00; H03K4/06; H03K4/08; H03K4/83; H03K4/84; H04; H04R; H04R25/00
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
79 words
A sonic insect repeller comprising oscillator means including a unijunction transistor coacting with a BC circuit for generating an output signal with a sawtooth waveform having a fundamental frequency and having substantially higher harmonics, said signal including noise components at frequencies substantially higher than said fundamental frequencies and occurring only at the peaks of said sawtooth waveform, means for cyclically varying said fundamental frequency over a selected range, and a transducer for converting said signal into a sonic waveform.
Claim 2
Dependent Claim
79 words
A sonic insect repeller comprising oscillator means including a unijunction transistor coacting with a BC circuit for generating an output signal with a sawtooth waveform having a fundamental frequency and having substantially higher harmonics, said signal including noise components at frequencies substantially higher than said fundamental frequencies and occurring only at the peaks of said sawtooth waveform, means for cyclically varying said fundamental frequency over a selected range, and a transducer for converting said signal into a sonic waveform.
Claim 3
Dependent Claim
24 words
A sonic insect repeller as recited in claim 1 wherein, said signal has a frequency spectrum covering the range from 10 to 100 kilohertz.
Claim 4
Dependent Claim
16 words
The sonic insect repeller as recited in claim 1, wherein said transducer includes a crystal transducer.
Claim 5
Dependent Claim
16 words
A sonic insect repeller as recited in claim 1, wherein said transducer includes a ceramic transducer.
Claim 6
Dependent Claim
20 words
A sonic insect repeller as recited in claim 1, wherein said transducer forms a capacitive element in said RC circuit.
Claim 7
Dependent Claim
82 words
A sonic insect repeller as recited in claim 1, wherein said means for varying said fundamental frequency of said output signal includes another oscillator including another unijunction transistor coacting with another RC circuit for generating a control signal with a sawtooth waveform of substantially lower fundamental frequency than that of said output signal, and means interconnecting said two oscillators for causing the fundamental frequency of said output signal to be cyclically varied in accordance with the fundamental frequency of said control signal.
Claim 8
Dependent Claim
65 words
A sonic insect repeller as recited in claim 6, wherein the RC circuit in each of said two oscillators includes a resistive portion and a capacitive portion interconnected via a junction, said interconnecting means between the two oscillators including a resistive connection between the respective junctions of said RC circuits, the capacitive portion of the RC circuit for said output signal oscillator including said transducer.
Claim 9
Dependent Claim
39 words
A sonic insect repeller as recited in claim 7, wherein said selected range of the fundamental frequency of said output signal is from 10-100 kilohertz and the fundamental frequency of said control signal is between 6 and 40 hertz.
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) | 1978-05-26 | 1978-11-25 | 1979-05-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-05-26 | 1982-11-25 | 1983-05-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-05-26 | 1986-11-25 | 1987-05-27 | $7700.00 | Window Closed / Lapsed |