Patent US3684916A successfully refreshed from Google Patents.
US3684916A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Headlamp turn off time delay
Assignee: Motors Liquidation Co
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Filing: 1970-01-12
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Granted: 1972-08-15
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Expires: 1990-01-12
Abstract
Abstract A time delay system for turning off vehicle headlamps when the vehicle ignition switch is off and the headlight switch is moved from the ''''on'''' position to the ''''off'''' position including a holding relay and a thermistor in circuit to delay the turning off of the lamps for a period of from 30 to 40 seconds.
Inventors
- 👤 Kenneth R Skinner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 17:33
CPC Classifications
B; B60; B60Q; B60Q9/00; B60Q9/001
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
101 words
A time delay system for turning off the headlamps of a motor vehicle including a first circuit comprising a first and second contact, a source of voltage and said vehicle headlamps, a switch electrically bridging said contacts to complete said circuit and turn on said headlamps, a second circuit comprising in series said contacts, said source of voltage, a relay including a fixed contact and a movable contact, a temperature responsive resistance element, a rectifier, and the ignition switch of said vehicle, and a third circuit comprising in series said source of voltage, said headlamps and said fixed and movable contacts.
Claim 2
Dependent Claim
101 words
A time delay system for turning off the headlamps of a motor vehicle including a first circuit comprising a first and second contact, a source of voltage and said vehicle headlamps, a switch electrically bridging said contacts to complete said circuit and turn on said headlamps, a second circuit comprising in series said contacts, said source of voltage, a relay including a fixed contact and a movable contact, a temperature responsive resistance element, a rectifier, and the ignition switch of said vehicle, and a third circuit comprising in series said source of voltage, said headlamps and said fixed and movable contacts.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-08-15 | 1976-02-14 | 1976-08-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-08-15 | 1980-02-14 | 1980-08-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-08-15 | 1984-02-14 | 1984-08-15 | $7700.00 | Window Closed / Lapsed |