US3618079A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Solid state interrupter system
Assignee: Sparton Corp
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Filing: 1968-06-20
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Granted: 1971-11-02
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Expires: 1988-06-20
Abstract
Abstract A solid state timing circuit of an interrupter system type utilizing a complementary pair of binary or square wave circuit, receiving pulses from a unijunction transistor oscillator to produce a pulsing square wave output. The pulse and square wave output may be used with a transistor switch circuit to operate a vehicle warning light system, for instance, and/or may be used in conjunction with a silicon controlled rectifier circuit for intermittently operating a vehicle horn. The silicon-controlled rectifier circuit utilizing the vibrating make and break contacts of a diaphragm-operated horn to switch the rectifier. Also, a short circuit protection circuit for the transistor switch circuit is disclosed.
Inventors
- 👤 Everett L Denning
- 👤 Dan Goor
- 👤 Frederick J T Dow
- 👤 Michael P Greenberg
- 👤 Poul H Anderson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 17:46
CPC Classifications
B; B60; B60Q; B60Q1/00; B60Q1/26; B60Q1/34; B60Q1/38; B60Q1/381
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
268 words
A solid state timing circuit for use with a vehicle warning system, comprising, in combination, a negative supply transistor, conductor means interconnecting said transistors to define a complementary pair transistor binary output circuit, a power supply connected to the emitters of said transistors, a unijunction transistor oscillator circuit, first means connecting said unijunction transistor circuit to the base of said positive supply transistor, second means connecting said unijunction transistor circuit to the base of said negative supply transistor whereby a positive pulse from said unijunction transistor starts said positive supply transistor conducting and produces a regenerative action causing saturation of said supply transistors the following positive pulse from said unijunction transistor producing a positive charge on the base of said negative supply transistor higher than the positive power supply potential tending to turn said negative supply transistor off producing a negative action in the opposite sense than that previously occurring ceasing conduction of said supply transistors and preparing the circuit for the next cycle to produce a pulsing square wave output, a capacitor within said oscillator circuit, a feedback circuit interposed between the collector of said negative supply transistor and the emitter of said unijunction transistor oscillator circuit including said capacitor whereby conducting of said negative supply transistor aids in charging said capacitor producing unequal durations of time between pulses produced by said unijunction transistor oscillator circuit, and a transistor switching circuit having an output, said switching circuit being connected to said square wave output receiving a pulsed square wave output signal therefrom, and a vehicle lightwaving system connected to and receiving the output of said switching circuit.
Claim 2
Dependent Claim
268 words
A solid state timing circuit for use with a vehicle warning system, comprising, in combination, a negative supply transistor, conductor means interconnecting said transistors to define a complementary pair transistor binary output circuit, a power supply connected to the emitters of said transistors, a unijunction transistor oscillator circuit, first means connecting said unijunction transistor circuit to the base of said positive supply transistor, second means connecting said unijunction transistor circuit to the base of said negative supply transistor whereby a positive pulse from said unijunction transistor starts said positive supply transistor conducting and produces a regenerative action causing saturation of said supply transistors the following positive pulse from said unijunction transistor producing a positive charge on the base of said negative supply transistor higher than the positive power supply potential tending to turn said negative supply transistor off producing a negative action in the opposite sense than that previously occurring ceasing conduction of said supply transistors and preparing the circuit for the next cycle to produce a pulsing square wave output, a capacitor within said oscillator circuit, a feedback circuit interposed between the collector of said negative supply transistor and the emitter of said unijunction transistor oscillator circuit including said capacitor whereby conducting of said negative supply transistor aids in charging said capacitor producing unequal durations of time between pulses produced by said unijunction transistor oscillator circuit, and a transistor switching circuit having an output, said switching circuit being connected to said square wave output receiving a pulsed square wave output signal therefrom, and a vehicle lightwaving system connected to and receiving the output of said switching circuit.
Claim 3
Dependent Claim
273 words
A solid state timing circuit for use with a vehicle warning system, comprising, in combination, a negative supply transistor, conductor means interconnecting said transistors to define a complementary pair transistor binary output circuit, a power supply connected to the emitters of said transistors, a unijunction transistor oscillator circuit, first means connecting said unijunction transistor circuit to the base of said positive supply transistor, second means connecting said unijunction transistor circuit to the base of said negative supply transistor whereby a positive pulse from said unijunction transistor starts said positive supply transistor conducting and produces a regenerative action causing saturation of said supply transistors, the following positive pulse from said unijunction transistor producing a positive charge on the base of said negative supply transistor higher than the positive power supply potential tending to turn said negative supply transistor off producing a regenerative action in the opposite sense than that previously occuring ceasing conduction of said supply transistors and preparing the circuit for the next cycle to produce a pulsing square wave output, a capacitor within said oscillator circuit, a feedback circuit interposed between the collector of said negative supply transistor and the emitter oF said unijunction transistor oscillator circuit including said capacitor whereby conducting of said negative supply transistor aids in charging said capacitor producing unequal durations of time between pulses produced by said unijunction transistor oscillator circuit, and a silicon-controlled rectifier circuit connected to said square wave output, said rectifier circuit having an output connected to a vehicle warning circuit including vibrating opening and closing contacts rapidly making and breaking said warning circuit upon being energized, said contacts controlling switching of said rectifier.
Claim 4
Dependent Claim
273 words
A solid state timing circuit for use with a vehicle warning system, comprising, in combination, a negative supply transistor, conductor means interconnecting said transistors to define a complementary pair transistor binary output circuit, a power supply connected to the emitters of said transistors, a unijunction transistor oscillator circuit, first means connecting said unijunction transistor circuit to the base of said positive supply transistor, second means connecting said unijunction transistor circuit to the base of said negative supply transistor whereby a positive pulse from said unijunction transistor starts said positive supply transistor conducting and produces a regenerative action causing saturation of said supply transistors, the following positive pulse from said unijunction transistor producing a positive charge on the base of said negative supply transistor higher than the positive power supply potential tending to turn said negative supply transistor off producing a regenerative action in the opposite sense than that previously occuring ceasing conduction of said supply transistors and preparing the circuit for the next cycle to produce a pulsing square wave output, a capacitor within said oscillator circuit, a feedback circuit interposed between the collector of said negative supply transistor and the emitter oF said unijunction transistor oscillator circuit including said capacitor whereby conducting of said negative supply transistor aids in charging said capacitor producing unequal durations of time between pulses produced by said unijunction transistor oscillator circuit, and a silicon-controlled rectifier circuit connected to said square wave output, said rectifier circuit having an output connected to a vehicle warning circuit including vibrating opening and closing contacts rapidly making and breaking said warning circuit upon being energized, said contacts controlling switching of said rectifier.
Claim 5
Dependent Claim
18 words
In a solid state timing circuit as in claim 2 wherein said warning circuit comprises a diaphragm-type horn.
References Cited (Backward Citations)
US3138722A
Cited
US3271760A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-11-01 | 1975-05-03 | 1975-11-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-11-01 | 1979-05-03 | 1979-11-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-11-01 | 1983-05-03 | 1983-11-02 | $7700.00 | Window Closed / Lapsed |