US3636470A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Variable inductance-controlled oscillator switching circuit
Assignee: Olivetti SpA
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Filing: 1970-10-27
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Granted: 1972-01-18
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Expires: 1990-10-27
Abstract
Abstract An electronic switching circuit including a transistor oscillator changeable between its oscillating and nonoscillating condition. The oscillator includes an inductor variable between an inductance at which the oscillating condition exists and an inductance at which the oscillating condition is stopped.
Inventors
- 👤 Alfredo Olivel
- 👤 Guido Fiorentino
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 06:37
CPC Classifications
H; H03; H03K; H03K17/00; H03K17/94; H03K17/945; H03K17/95; H03K17/952; H03K17/953; H03K17/9535; F; F02; F02P; F02P7/00; F02P7/06; F02P7/061; H03K17/965; H03K17/97; H03K3/00; H03K2017/9706
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
188 words
An electronic-switching circuit having a transistor oscillator wherein the switching states of said circuit are determined by the oscillatory and nonoscillatory conditions of said oscillator, comprising: a transistor, capacitance means having a terminal connected to the emitter of said transistor and variable inductance means having a terminal connected to the base of said transistor, said capacitance means and said inductance means being connected in series to form with the base-emitter junction of said transistor a closed loop oscillating circuit when said variable inductance means is at a predetermined value, feedback means connected in parallel with said capacitance means for feeding back to the emitter of said transistor signals present at the base of said transistor for maintaining an oscillating condition, once assumed, and for clamping the oscillations of said oscillating circuit when said variable inductance means is at a value other than said predetermined value, means for varying the inductance of said variable inductance means from said predetermined value at which an oscillating condition of the oscillator is assumed to a value at which the oscillating condition is stopped, and means for applying bias voltages to said transistor.
Claim 2
Dependent Claim
188 words
An electronic-switching circuit having a transistor oscillator wherein the switching states of said circuit are determined by the oscillatory and nonoscillatory conditions of said oscillator, comprising: a transistor, capacitance means having a terminal connected to the emitter of said transistor and variable inductance means having a terminal connected to the base of said transistor, said capacitance means and said inductance means being connected in series to form with the base-emitter junction of said transistor a closed loop oscillating circuit when said variable inductance means is at a predetermined value, feedback means connected in parallel with said capacitance means for feeding back to the emitter of said transistor signals present at the base of said transistor for maintaining an oscillating condition, once assumed, and for clamping the oscillations of said oscillating circuit when said variable inductance means is at a value other than said predetermined value, means for varying the inductance of said variable inductance means from said predetermined value at which an oscillating condition of the oscillator is assumed to a value at which the oscillating condition is stopped, and means for applying bias voltages to said transistor.
Claim 3
Dependent Claim
37 words
The electronic-switching circuit defined in claim 1 wherein said biasing means applies bias voltages between the transistor collector and the junction of said capacitor and said inductor means and between the transistor emitter and said junction, respectively.
Claim 4
Dependent Claim
16 words
The electronic-switching circuit defined in claim 1 wherein said varying means comprises a movable ferromagnetic element.
Claim 5
Dependent Claim
56 words
The electronic-switching circuit defined in claim 1 wherein said feedback means comprises a diode connected in parallel with said capacitor and poled so as to feed back positive signals to the emitter of said transistor and a second capacitor connected between the junction of said capacitor and said inductor means and the emitter of said transistor.
Claim 6
Dependent Claim
16 words
The electrical-switching circuit defined in claim 4 wherein said varying means comprises a movable ferromagnetic element.
Claim 7
Dependent Claim
100 words
The electronic-switching circuit defined in claim 4 wherein said means for applying bias voltages comprises a voltage source connected between a bias terminal and a reference potential, including: a first resistor connected to the emitter of said transistor in series with said second capacitor, the junction between said second capacitor and said resistor being connected to said bias terminal, a third capacitor connected between the collector of said transistor and said bias terminal, and an output resistor connected between the collector of said transistor and said reference potential, the output of said switching circuit being available across said output resistor.
Claim 8
Dependent Claim
16 words
The electronic-switching circuit defined in claim 6 wherein said varying means comprises a movable ferromagnetic element.
Claim 9
Dependent Claim
41 words
The electronic-switching circuit defined in claim 1 further comprising a Zener diode connected between the collector of said transistor and the junction of said inductance means and said capacitor for controlling the collector-base voltage when said oscillating circuit is not oscillating.
Claim 10
Dependent Claim
16 words
The electronic-switching circuit defined in claim 8, wherein said varying means comprises a movable ferromagnetic element.
Claim 11
Dependent Claim
57 words
The electronic switching circuit defined in claim 8, wherein said feedback means comprises a diode connected in parallel with said capacitor and poled so as to feed back positive signals to the emitter of said transistor and a second capacitor connected between the junction of said inductance means and said capacitor and the emitter of said transistor.
Claim 12
Dependent Claim
182 words
An electronic-switching circuit, comprising: an oscillator means having a dynamic negative resistance and a positive reactance and a capacitor connected in series and connected to said oscillator means to form a closed loop, said dynamic resistance being variable to assume negative and positive values and said reactance being variable to assume only positive values, said series combination forming an oscillatory circuit when said resistance is negative and said reactance is at a predetermined positive value so that the switching states of said switching circuit are determined by the oscillatory and nonoscillatory conditions of said oscillator, feedback means connected in parallel with said capacitor for maintaining an oscillatory condition of said oscillator when said resistance is negative and said reactance is at a predetermined positive value and for performing a clamping of the oscillations of said oscillator when said resistance is negative and said reactance is different from said predetermined value, and means for varying said resistance and said reactance from a value at which an oscillatory condition of the oscillator is assumed to a value at which the oscillatory condition is stopped.
Claim 13
Dependent Claim
182 words
An electronic-switching circuit, comprising: an oscillator means having a dynamic negative resistance and a positive reactance and a capacitor connected in series and connected to said oscillator means to form a closed loop, said dynamic resistance being variable to assume negative and positive values and said reactance being variable to assume only positive values, said series combination forming an oscillatory circuit when said resistance is negative and said reactance is at a predetermined positive value so that the switching states of said switching circuit are determined by the oscillatory and nonoscillatory conditions of said oscillator, feedback means connected in parallel with said capacitor for maintaining an oscillatory condition of said oscillator when said resistance is negative and said reactance is at a predetermined positive value and for performing a clamping of the oscillations of said oscillator when said resistance is negative and said reactance is different from said predetermined value, and means for varying said resistance and said reactance from a value at which an oscillatory condition of the oscillator is assumed to a value at which the oscillatory condition is stopped.
Claim 14
Dependent Claim
39 words
The electronic-switching circuit defined in claim 11, wherein said means for varying comprises a movable ferromagnetic element adapted to vary said resistance and said reactance for the purpose of selectively controlling the oscillatory and nonoscillatory conditions of said oscillator.
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 |