Patent US3821702A successfully refreshed from Google Patents.
US3821702A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Lighting system for controlling lights of motor vehicle to glow in a reduced luminous intensity during the nighttime
Assignee: Nissan Motor Co Ltd
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Filing: 1972-02-22
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Granted: 1974-06-28
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Expires: 1992-02-22
Abstract
Abstract A lighting system for lighting various lamps installed in a motor vehicle, comprising at least one flasher unit for producing a turn signal having a constant repetition frequency, at least one lamp, connecting circuit for connecting said flasher unit direct to said lamp or through a resistor to said lamp, and a shunt circuit for bypassing through a resistor the lamp and the connecting circuit when the connecting circuit connects the flasher unit to the lamp through resistor. The load impedance of the flasher unit is therefore maintained constant so that the load current of the flasher unit stays constant whereby the repetition frequency of the turn signal stays substantially constant.
Inventors
- 👤 T Mogi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 17:15
CPC Classifications
B; B60; B60Q; B60Q1/00; B60Q1/26; B60Q1/34; B60Q1/38; B60Q1/2603
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
332 words
A lighting system for a motor vehicle connected between a first terminal of an electrical energy source and a second terminal of this source which is grounded, which comprises: at least one flasher unit with an input terminal connected to said first terminal for producing a flashing signal having a constant repetition frequency; at least one change-over switch having a movable contact connected to the output terminal of said flasher unit and a pair of stationary contacts; at least one first lamp having one terminal connected to one of said stationary contacts; at least one second lamp having one terminal connected to the other of said stationary contacts; a relay having a relay coil and a plurality of relay switches, said coil being connected, in series with another switch, between the terminals of the energy source. a first normally closed relay switch in said relay adapted to be actuated during the night time when said another switch is closed and having one contact connected to the other terminal of said first lamp and the other contact connected to the ground; a first resistor bypassing said first normally closed relay switch; a second normally closed relay switch in said relay adapted to be actuated when said coil is energized during the night time and having one contact connected to the other terminal of said second lamp and the other contact connected to the ground; a second resistor bypassing said second normally closed relay switch; a first rectifier having its anode connected to said one terminal of said first lamp; a second rectifier having its anode connected to said one terminal of said second lamp; a third resistor having one terminal connected to both cathodes of said first and second rectifiers; and a normally open relay switch in said relay having one contact connected to the other terminal of said third resistor and the other contact connected to the ground, said normally open relay switch adapted to be actuated when said coil is energized.
Claim 2
Dependent Claim
332 words
A lighting system for a motor vehicle connected between a first terminal of an electrical energy source and a second terminal of this source which is grounded, which comprises: at least one flasher unit with an input terminal connected to said first terminal for producing a flashing signal having a constant repetition frequency; at least one change-over switch having a movable contact connected to the output terminal of said flasher unit and a pair of stationary contacts; at least one first lamp having one terminal connected to one of said stationary contacts; at least one second lamp having one terminal connected to the other of said stationary contacts; a relay having a relay coil and a plurality of relay switches, said coil being connected, in series with another switch, between the terminals of the energy source. a first normally closed relay switch in said relay adapted to be actuated during the night time when said another switch is closed and having one contact connected to the other terminal of said first lamp and the other contact connected to the ground; a first resistor bypassing said first normally closed relay switch; a second normally closed relay switch in said relay adapted to be actuated when said coil is energized during the night time and having one contact connected to the other terminal of said second lamp and the other contact connected to the ground; a second resistor bypassing said second normally closed relay switch; a first rectifier having its anode connected to said one terminal of said first lamp; a second rectifier having its anode connected to said one terminal of said second lamp; a third resistor having one terminal connected to both cathodes of said first and second rectifiers; and a normally open relay switch in said relay having one contact connected to the other terminal of said third resistor and the other contact connected to the ground, said normally open relay switch adapted to be actuated when said coil is energized.
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) | 1977-06-27 | 1977-12-27 | 1978-06-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-06-27 | 1981-12-27 | 1982-06-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-06-27 | 1985-12-27 | 1986-06-28 | $7700.00 | Window Closed / Lapsed |