US3636559A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ultrasonic rat elimination system having random modulation
Assignee: RAT ELIMINATION SYSTEM Ltd
•
Filing: 1968-11-18
•
Granted: 1972-01-18
•
Expires: 1988-11-18
Abstract
Abstract Apparatus and method for repelling rats and mice from an area by means of generation of a modulated ultrasonic sound level. The sound level is frequency modulated within a range of ultrasonic frequencies to which rats and mice respond. In addition, it is amplitude modulated in a random manner. The modulations of the signal prevent rats and mice from adapting to the sound, and thereby renders the sound particularly unpleasant to them.
Inventors
- 👤 Dominic Del Grande
- 👤 Donald C Erdman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 11:12
CPC Classifications
B; B06; B06B; B06B1/00; B06B1/02; B06B1/0207; B06B1/0223; B06B1/0269; B06B1/0284; A; A01; A01M; A01M29/00; A01M29/16; A01M29/18; B06B2201/00; B06B2201/20; B06B2201/70; B06B2201/75
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
101 words
An ultrasonic random noise generating apparatus for repelling rats and mice comprising: a square wave generator for generating a periodically varying electric signal within the ultrasonic frequency range; first signal source means connected to the generator for repetitiously cycling the frequency of said periodically varying electric signal over a predetermined ultrasonic frequency range; second signal source means connected to the generator for modulating the amplitude of said periodically varying electric signal out of phase with the frequency cycling means; and speaker means coupled to the square wave generator for converting the modulated and cycled periodically varying electric signal to air vibrations.
Claim 2
Dependent Claim
101 words
An ultrasonic random noise generating apparatus for repelling rats and mice comprising: a square wave generator for generating a periodically varying electric signal within the ultrasonic frequency range; first signal source means connected to the generator for repetitiously cycling the frequency of said periodically varying electric signal over a predetermined ultrasonic frequency range; second signal source means connected to the generator for modulating the amplitude of said periodically varying electric signal out of phase with the frequency cycling means; and speaker means coupled to the square wave generator for converting the modulated and cycled periodically varying electric signal to air vibrations.
Claim 3
Dependent Claim
26 words
Apparatus according to claim 1 in which the frequency modulating means sweeps the frequency of the generator within the range of 18.5 kHz. to 30 kHz.
Claim 4
Dependent Claim
36 words
Apparatus according to claim 2 further comprising an amplifier coupled between the generator and the speaker for amplifying the electrical signal sufficiently to provide an ultrasonic sound level from the speaker of at least 100 decibels.
Claim 5
Dependent Claim
102 words
Apparatus for repelling rats and mice comprising: an oscillator for generating an electrical signal within the ultrasonic frequency range; a sawtooth generator coupled to the oscillator for causing a periodic sweeping of the generated signal within the frequency range of 81.5 kHz. to 30 kHz.; a signal source asynchronous with the sawtooth generator also coupled to the oscillator for modulating the amplitude of the electrical signal; a speaker coupled to the oscillator; and an amplifier coupled between the oscillator and the speaker for amplifying the electrical signal sufficiently to provide an ultrasonic sound level from the speaker of at least 100 decibels.
Claim 6
Dependent Claim
102 words
Apparatus for repelling rats and mice comprising: an oscillator for generating an electrical signal within the ultrasonic frequency range; a sawtooth generator coupled to the oscillator for causing a periodic sweeping of the generated signal within the frequency range of 81.5 kHz. to 30 kHz.; a signal source asynchronous with the sawtooth generator also coupled to the oscillator for modulating the amplitude of the electrical signal; a speaker coupled to the oscillator; and an amplifier coupled between the oscillator and the speaker for amplifying the electrical signal sufficiently to provide an ultrasonic sound level from the speaker of at least 100 decibels.
Claim 7
Dependent Claim
14 words
Apparatus according to claim 4 in which the oscillator comprises a square wave generator.
Claim 8
Dependent Claim
37 words
Apparatus according to claim 4 further comprising a switch coupled between the oscillator and the speaker and means for repeatedly turning the switch on and off to effect interruptions in the ultrasonic sound output of the speaker.
Claim 9
Dependent Claim
51 words
Apparatus according to claim 4 in which the means for repeatedly turning the switch on and off comprises a square wave oscillator for turning the switch on and off for equal periods of time, the square wave oscillAtor being asynchronous with both the sawtooth generator and the amplitude modulating signal source.
Claim 10
Dependent Claim
106 words
Apparatus for repelling rats and mice comprising: an oscillator for generating an electrical signal within the ultrasonic frequency range; a sawtooth generator coupled to the oscillator for causing a periodic sweeping of the generated signal within the frequency range of 18.5 kHz. to 30 kHz.; a signal source asynchronous with the sawtooth generator also coupled to the oscillator for modulating the amplitude of the electrical signal; a plurality of speakers; a plurality of switches coupling respective ones of the speakers to the oscillator; and means for repeatedly and sequentially opening and closing the switches, each switch being opened upon the closing of the next succeeding switch.
Claim 11
Dependent Claim
106 words
Apparatus for repelling rats and mice comprising: an oscillator for generating an electrical signal within the ultrasonic frequency range; a sawtooth generator coupled to the oscillator for causing a periodic sweeping of the generated signal within the frequency range of 18.5 kHz. to 30 kHz.; a signal source asynchronous with the sawtooth generator also coupled to the oscillator for modulating the amplitude of the electrical signal; a plurality of speakers; a plurality of switches coupling respective ones of the speakers to the oscillator; and means for repeatedly and sequentially opening and closing the switches, each switch being opened upon the closing of the next succeeding switch.
Claim 12
Dependent Claim
57 words
Apparatus according to claim 8 in which the means for opening and closing the switches comprises an astable multivibrator coupled to a plurality of delay multivibrators to sequentially energize the delay multivibrators, each delay multivibrator being coupled to a respective one of the switches, each switch being closed responsive to the energization of its associated delay multivibrator.
Claim 13
Dependent Claim
34 words
Apparatus according to claim 9 comprising three switches and three delay multivibrators and in which each delay multivibrator has a period equal to one-third of the interval between pulses provided by the astable multivibrator.
Claim 14
Independent Claim
79 words
A method of repelling rats and mice comprising the steps of: generating an electrical signal within the ultrasonic frequency range; modulating the frequency of the electrical signal by causing it to cyclically sweep through a range of frequencies between 18.5 kHz. and 30 kHz.; modulating the amplitude of the electrical signal asynchronously with the cyclical sweep; and converting the modulated signal to air vibrations of a magnitude sufficient to produce an ultrasonic sound level of at least 100 decibels.
Claim 15
Independent Claim
79 words
A method of repelling rats and mice comprising the steps of: generating an electrical signal within the ultrasonic frequency range; modulating the frequency of the electrical signal by causing it to cyclically sweep through a range of frequencies between 18.5 kHz. and 30 kHz.; modulating the amplitude of the electrical signal asynchronously with the cyclical sweep; and converting the modulated signal to air vibrations of a magnitude sufficient to produce an ultrasonic sound level of at least 100 decibels.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-01-17 | 1975-07-19 | 1976-01-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-01-17 | 1979-07-19 | 1980-01-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-01-17 | 1983-07-19 | 1984-01-18 | $7700.00 | Window Closed / Lapsed |