US3697983A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Alerting devices, oscillators and flip flops
Assignee: ARCOTRONICS Inc
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Filing: 1971-08-20
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Granted: 1972-10-10
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Expires: 1991-08-20
Abstract
Abstract Sonic alerting devices of the type controlled by natural frequency of the transducer have efficient drives and can omit capacitors by employing two transistors connected in series configuration with transducer operation in the series resonant mode. In asymmetrical Circuits a first transistor in its energized state controls a second transistor through a potential drop device, the second transistor may conduct slightly in its de-energized state and serve as a circuit impedance for the first, and the second transistor is connected back to the first through the transducer by which the first transistor is deenergized and the second transistor changes to its energized state. A general class of multivibrators using the asymmetrical circuit is also represented by bistable flip flops and free running multivibrators. Transistors of all the same NPN or PNP syntax and omission of resistors in the power stage enable compact integrated circuits to be formed on single semiconductor chips.
Inventors
- 👤 Bronson M Potter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 22:51
CPC Classifications
H; H03; H03K; H03K3/00; H03K3/02; H03K3/26; H03K3/28; H03K3/281; H03K3/282; H03K3/283; G; G08; G08B; G08B3/00; G08B3/10
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
110 words
In an electronic circuit having transistors and capable, when connected to a power supply, of operating a load at least momentarily in either of two different states, the improvement wherein there is a first transistor connected to a second transistor through potential drop means, and said second transistor connected back to said first transistor through an empedance, said first transistor connected for common base operation in its energized state and said second transistor connected for common collector operation in its energized state, one side of said load connected between said second transistor, and said potential drop means, another side of said load connected between said impedance and said first transistor.
Claim 2
Dependent Claim
110 words
In an electronic circuit having transistors and capable, when connected to a power supply, of operating a load at least momentarily in either of two different states, the improvement wherein there is a first transistor connected to a second transistor through potential drop means, and said second transistor connected back to said first transistor through an empedance, said first transistor connected for common base operation in its energized state and said second transistor connected for common collector operation in its energized state, one side of said load connected between said second transistor, and said potential drop means, another side of said load connected between said impedance and said first transistor.
Claim 3
Dependent Claim
14 words
The electronic circuit of claim 1 wherein said potential drop means comprises a diode.
Claim 4
Dependent Claim
106 words
The electronic circuit of claim 1 including a pair of conductors across which a D.C. voltage may be applied, the emitter of said first transistor connected through a suitable impedance to the first of said conductors, the collector of said first transistor connected to the base of said second transistor and connected through said potential drop means to the emitter of said second transistor, the collector of said second transistor connected directly to the second of said conductors, And the base of said first transistor connected to a point of substantially constant potential of a value lying between the values of potential applied to said conductors.
Claim 5
Dependent Claim
43 words
The electronic circuit of claim 3 wherein the base of said second transistor is connected through a resistance to the second of said conductors sized to bias said second transistor to its energized state in the absence of energization of said first transistor.
Claim 6
Dependent Claim
28 words
The electronic circuit of claim 3 including means defining the point of substantially constant potential in the form of a voltage determining network extending between said two conductors.
Claim 7
Dependent Claim
13 words
The electronic circuit of claim 1 wherein said load is a reactive element.
Claim 8
Dependent Claim
15 words
The electronic circuit of claim 6 wherein said reactive element is a radio frequency crystal.
Claim 9
Dependent Claim
24 words
The electronic circuit of claim 6 wherein the reactance of said element is defined at least in part by a transducer storing mechanical energy.
Claim 10
Dependent Claim
14 words
The electronic circuit of claim 8 wherein said reactive element is a sonic transducer.
Claim 11
Dependent Claim
13 words
The circuit of claim 9 in which said transducer is a piezoelectric element.
Claim 12
Dependent Claim
27 words
The electronic circuit of claim 9 wherein the natural frequency of oscillation of said sonic transducer is within the frequency range of sensitivity of the human ear.
References Cited (Backward Citations)
US3440648A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-10-10 | 1976-04-10 | 1976-10-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-10-10 | 1980-04-10 | 1980-10-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-10-10 | 1984-04-10 | 1984-10-10 | $7700.00 | Window Closed / Lapsed |