US4852681A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Device for preventing the theft of motor vehicles
Assignee: Valeo Neiman SA
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Filing: 1988-07-06
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Granted: 1989-08-01
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Expires: 2008-07-06
Abstract
Abstract An anti-theft device for motor vehicles which operates by cutting off the electrical supply to the ignition by a relay supplied by a central electronic unit which is connected in series with the "on" contact of the anti-theft steering lock of the vehicle characterized in that the relay is connected to the central unit through at least one transistor and to ground by a switch device which is maintained open while the engine is running.
Inventors
- 👤 Jean Bombled
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 14:50
CPC Classifications
B; B60; B60R; B60R25/00; B60R25/01; B60R25/04; B60R25/045
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
138 words
In an anti-theft device for motor vehicles operating by cutting off the electrical supply to the engine ignition circuit by means of a relay which is movable from a first closed position to a second open position when energized by a control circuit including a central electronic unit which is connected in series with the "on" contact of the vehicle's anti-theft steering switch when in a monitoring mode, the improvement of (a) at least one transistor connected between the relay and the central unit through which transistor the central unit can energize the relay when in a monitoring mode and the "on" contact of the anti-theft steering switch is closed, (b) a switch device for grounding the relay when the engine is not running, and (c) said switch device being open from ground while the engine is running.
Claim 2
Dependent Claim
138 words
In an anti-theft device for motor vehicles operating by cutting off the electrical supply to the engine ignition circuit by means of a relay which is movable from a first closed position to a second open position when energized by a control circuit including a central electronic unit which is connected in series with the "on" contact of the vehicle's anti-theft steering switch when in a monitoring mode, the improvement of (a) at least one transistor connected between the relay and the central unit through which transistor the central unit can energize the relay when in a monitoring mode and the "on" contact of the anti-theft steering switch is closed, (b) a switch device for grounding the relay when the engine is not running, and (c) said switch device being open from ground while the engine is running.
Claim 3
Dependent Claim
17 words
The anti-theft device of claim 1, wherein said transistor is connected to ground through said switch device.
Claim 4
Dependent Claim
30 words
The anti-theft device of claim 1, wherein a second transistor is provided mounted in a cascade with said first transistor, through which the relay is energized by the central unit.
References Cited (Backward Citations)
US4533016A
Cited
US4485887A
Cited
US4682062A
Cited
US4672225A
Cited
US4733638A
Cited
FR2608112A1
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-07-31 | 1993-01-30 | 1993-08-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-07-31 | 1997-01-30 | 1997-08-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-07-31 | 2001-01-30 | 2001-08-01 | $7700.00 | Window Closed / Lapsed |