US3723807A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Automotive headlamp delayed off device
Assignee: Lanteris Space LLC
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Filing: 1971-11-26
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Granted: 1973-03-27
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Expires: 1991-11-26
Abstract
Abstract A delayed-off headlamp circuit in which the delay feature is invoked only within a predetermined time interval after the ignition is turned off. Otherwise headlamp operation is normal. This permits the user to invoke a delay when he desires it but is not bothered by an undesired delay otherwise.
Inventors
- 👤 J Tozzi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 15:14
CPC Classifications
B; B60; B60Q; B60Q9/00; B60Q9/001
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
197 words
In an automotive electrical system comprising headlamps, a battery connected in said system for operating said headlamps, a headlamp switch connected in said system for making and breaking said connection between said battery and said headlamps, and an ignition switch having first and second terminals and an off position and an on position, said first terminal of said ignition switch being connected to a terminal of said battery, a. switching means connected across said headlamp switch and operative, for a first predetermined period of time after said headlamp switch has broken said connection, to bypass said headlamp switch thereby to continue the current supplied to said headlamps, said switching means being connected to said second terminal of said ignition switch and being operative only when said ignition switch is turned from said on position to said off posItion prior to operating said headlamp switch to break said headlamp connection, and b. control means, connected to said switching means and operated from said ignition switch, for reducing said first predetermined period of time to substantially zero at a second predetermined period of time after said ignition switch has been turned from said on position to said off position.
Claim 2
Dependent Claim
197 words
In an automotive electrical system comprising headlamps, a battery connected in said system for operating said headlamps, a headlamp switch connected in said system for making and breaking said connection between said battery and said headlamps, and an ignition switch having first and second terminals and an off position and an on position, said first terminal of said ignition switch being connected to a terminal of said battery, a. switching means connected across said headlamp switch and operative, for a first predetermined period of time after said headlamp switch has broken said connection, to bypass said headlamp switch thereby to continue the current supplied to said headlamps, said switching means being connected to said second terminal of said ignition switch and being operative only when said ignition switch is turned from said on position to said off posItion prior to operating said headlamp switch to break said headlamp connection, and b. control means, connected to said switching means and operated from said ignition switch, for reducing said first predetermined period of time to substantially zero at a second predetermined period of time after said ignition switch has been turned from said on position to said off position.
Claim 3
Dependent Claim
22 words
The system of claim 1 wherein said second predetermined period of time is substantially longer than said first predetermined period of time.
Claim 4
Dependent Claim
47 words
The system of claim 1 wherein said first predetermined period of time is established by the discharge of a first capacitor connected into said switching means, and said second predetermined period of time is established by the discharge of a second capacitor connected into said control means.
Claim 5
Dependent Claim
145 words
In a circuit for use in an automobile having a battery, headlamps connected to said battery, an ignition switch connected to said battery, and a headlamp switch connected to make and break said connection between said battery and said headlamps, said circuit having switching means connected across said headlamp switch, said switching means including a first delay circuit for introducing a time delay between the act of turning said headlamp switch off and the extinguishing of said headlamps, said switching means being actuated only when said ignition switch is turned off prior to said act of turning said headlamp switch off, the improvement comprising: control means connected to said switching means for reducing said time delay to substantially zero, said control means including a second delay circuit connected to automatically reduce said time delay at a predetermined time after said ignition switch is turned off.
Claim 6
Dependent Claim
145 words
In a circuit for use in an automobile having a battery, headlamps connected to said battery, an ignition switch connected to said battery, and a headlamp switch connected to make and break said connection between said battery and said headlamps, said circuit having switching means connected across said headlamp switch, said switching means including a first delay circuit for introducing a time delay between the act of turning said headlamp switch off and the extinguishing of said headlamps, said switching means being actuated only when said ignition switch is turned off prior to said act of turning said headlamp switch off, the improvement comprising: control means connected to said switching means for reducing said time delay to substantially zero, said control means including a second delay circuit connected to automatically reduce said time delay at a predetermined time after said ignition switch is turned off.
Claim 7
Dependent Claim
15 words
The circuit of claim 1 wherein said predetermined time is longer than said time delay.
References Cited (Backward Citations)
US3546527A
Cited
US3628085A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-03-26 | 1976-09-25 | 1977-03-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-03-26 | 1980-09-25 | 1981-03-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-03-26 | 1984-09-25 | 1985-03-27 | $7700.00 | Window Closed / Lapsed |