Patent US3706972A successfully refreshed from Google Patents.
US3706972A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Direction indicator for automobile
Assignee: Individual
•
Filing: 1971-04-23
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Granted: 1972-12-19
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Expires: 1991-04-23
Abstract
Abstract A direction indicator for automobiles having a negative grounded battery and utilizing semiconductor circuits for the control of two or more sets of lights individually with the lights of each set being operated in sequence or simultaneously to indicate a change in direction of the vehicle and relatively high resistance lights in series with the direction lights to indicate to the driver improper operation of the circuit.
Inventors
- 👤 Seiichi Okuhara
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 03:56
CPC Classifications
B; B60; B60Q; B60Q1/00; B60Q1/26; B60Q1/34; B60Q1/38; B60Q1/381
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
221 words
A direction indicator for an automobile comprising a first circuit having first through n-th stages, a d.c. source for supplying an operating voltage to said stages, a pulse generator for generating a train of trigger pulses, each of said first through (n-1)th stages including a series connection of a silicon controlled rectifier and a direction indicating lamp forwardly connected between the both terminals of said d.c. source, and said n-th stage including a series connection of a silicon controlled rectifier and a resistor forwardly connected between both terminals of the d.c. source, said lamps and said resistor being connected respectively to the cathode electrodes of said silicon controlled rectifiers, a commutating capacitor connected between the cathode electrode of the silicon controlled rectifier in the first stage and the cathode electrode of the silicon controlled rectifier in the n-th stage, a series connection of a capacitor and an impedance element connected between the cathode electrode of the silicon controlled rectifier in each of the second through (n-1)th stages and the cathode electrode of the silicon controlled rectifier in the nth stage, said impedance element having an impedance varying in accordance with the direction of current passing therethrough, and second circuit means for applying said trigger pulses sequentially to the gate electrodes of said silicon controlled rectifiers in the first through n-th stages.
Claim 2
Dependent Claim
221 words
A direction indicator for an automobile comprising a first circuit having first through n-th stages, a d.c. source for supplying an operating voltage to said stages, a pulse generator for generating a train of trigger pulses, each of said first through (n-1)th stages including a series connection of a silicon controlled rectifier and a direction indicating lamp forwardly connected between the both terminals of said d.c. source, and said n-th stage including a series connection of a silicon controlled rectifier and a resistor forwardly connected between both terminals of the d.c. source, said lamps and said resistor being connected respectively to the cathode electrodes of said silicon controlled rectifiers, a commutating capacitor connected between the cathode electrode of the silicon controlled rectifier in the first stage and the cathode electrode of the silicon controlled rectifier in the n-th stage, a series connection of a capacitor and an impedance element connected between the cathode electrode of the silicon controlled rectifier in each of the second through (n-1)th stages and the cathode electrode of the silicon controlled rectifier in the nth stage, said impedance element having an impedance varying in accordance with the direction of current passing therethrough, and second circuit means for applying said trigger pulses sequentially to the gate electrodes of said silicon controlled rectifiers in the first through n-th stages.
Claim 3
Dependent Claim
25 words
A direction indicator for an automobile, according to claim 1 wherein said impedance element consists of a parallel connection of a diode and a resistor.
Claim 4
Dependent Claim
52 words
A direction indicator for an automobile aCcording to claim 1 including third circuit means for applying said trigger pulses concurrently to the gate electrodes of said silicon controlled rectifiers in the first through (n - 1)th stages, and switch means for selectively interchanging said second circuit means and said third circuit means.
Claim 5
Dependent Claim
57 words
A direction indicator for an automobile according to claim 1 wherein each of said first through (n - 1)th stages includes an operation indicating lamp connected between the anode and cathode electrodes of the silicon controlled rectifier in that stage, said operation indicating lamp having a lower power consumption than the direction indicating lamp in that stage.
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) | 1975-12-19 | 1976-06-19 | 1976-12-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-12-19 | 1980-06-19 | 1980-12-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-12-19 | 1984-06-19 | 1984-12-19 | $7700.00 | Window Closed / Lapsed |