US3840776A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Variable intensity illumination control system for a motor vehicle
Assignee: Nissan Motor Co Ltd
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Filing: 1973-05-29
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Granted: 1974-10-08
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Expires: 1993-05-29
Abstract
Abstract A system comprising a bulb having a filament for providing illumination and a filament responsive to and indicating a warning condition such as braking, means to automatically reduce the intensity of illumination of the warning filament when the illumination filament is energized, and means to manually vary the intensity of illumination of the illumination filament.
Inventors
- 👤 T Takeda
- 👤 T Mogi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 15:49
CPC Classifications
B; B60; B60Q; B60Q1/00; B60Q1/26; B60Q1/2603
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
117 words
A variable intensity illumination control system for a motor vehicle comprising: an electric power source; a dual filament lamp bulb which includes a high beam warning lamp filament having one terminal connected through a warning lamp switch to said power source and a low beam operating lamp filament having one terminal connected through an adjustable resistor and an operating lamp switch to said power source, the other terminals of said filaments being connected with each other; a dimming resistor having one terminal connected to said other terminals of said filaments and the other terminal grounded; and a switching means shunting said dimming resistor operable in response to closing said operating lamp switch to short-circuit said dimming resistor.
Claim 2
Dependent Claim
117 words
A variable intensity illumination control system for a motor vehicle comprising: an electric power source; a dual filament lamp bulb which includes a high beam warning lamp filament having one terminal connected through a warning lamp switch to said power source and a low beam operating lamp filament having one terminal connected through an adjustable resistor and an operating lamp switch to said power source, the other terminals of said filaments being connected with each other; a dimming resistor having one terminal connected to said other terminals of said filaments and the other terminal grounded; and a switching means shunting said dimming resistor operable in response to closing said operating lamp switch to short-circuit said dimming resistor.
Claim 3
Dependent Claim
54 words
A variable intensity illumination control system as claimed in claim 1, in which said high beam warning lamp filament serves as at least one of a stop lamp, turn signal lamp and pilot lamp, and said low beam operating lamp filament serves as at least one of a headlamp, tail lamp and parking lamp.
Claim 4
Dependent Claim
80 words
A variable intensity illumination control system as claimed in claim 1, in which said switching means is a normally-closed relay comprising a relay coil having one terminal connected to a junction between said adjustable resistor and said operating lamp switch and the other terminal grounded, and a relay contact assembly movable from a closed position in which it shunts said dimming resistor to an open position when said relay is energized in response to closing of said operating lamp switch.
Claim 5
Dependent Claim
28 words
A variable intensity illumination control system as claimed in claim 1, in which said dimming resistor has a value of resistance less than that of said adjustable resistor.
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) | 1977-10-07 | 1978-04-08 | 1978-10-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-10-07 | 1982-04-08 | 1982-10-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-10-07 | 1986-04-08 | 1986-10-08 | $7700.00 | Window Closed / Lapsed |