US5818330A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Anti-theft system for a motor vehicle
Assignee: Siemens AG
•
Filing: 1997-07-30
•
Granted: 1998-10-06
•
Expires: 2017-07-30
Abstract
Abstract An anti-theft system for a motor vehicle includes a portable code transmitter which transmits a code signal from a distance upon actuation. A receiver unit in the motor vehicle receives the code signal and evaluates it. Upon authorization, only the engine is started, but the vehicle does not have to be unlocked. A further code signal is required in order to drive the vehicle. However, it must be generated in the vehicle interior. Thus the engine can already warm up without the user being located in the vicinity of the vehicle.
Inventors
- 👤 Jurgen Schweiger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 17:33
CPC Classifications
B; B60; B60R; B60R25/00; B60R25/01; B60R25/02; B60R25/04; B60R25/06; B60R25/08; B60R25/20; B60R25/209; B60R25/24; G; G07; G07C; G07C9/00; G07C9/00174; G07C9/00182; G07C2009/00753; G07C2009/00769
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
98 words
An anti-theft system for a motor vehicle, comprising: a portable code transmitter having a transmitter unit transmitting a coded engine starting signal upon actuation; a receiver unit in a motor vehicle for receiving the engine starting signal, comparing the engine starting signal with an expected desired code signal and generating a control signal for starting an engine if the two signals agree; and a central control unit in the motor vehicle for enabling use or driving of the vehicle only if an enable signal received by the control unit has agreed beforehand with an expected desired enable signal.
Claim 2
Dependent Claim
98 words
An anti-theft system for a motor vehicle, comprising: a portable code transmitter having a transmitter unit transmitting a coded engine starting signal upon actuation; a receiver unit in a motor vehicle for receiving the engine starting signal, comparing the engine starting signal with an expected desired code signal and generating a control signal for starting an engine if the two signals agree; and a central control unit in the motor vehicle for enabling use or driving of the vehicle only if an enable signal received by the control unit has agreed beforehand with an expected desired enable signal.
Claim 3
Dependent Claim
17 words
The anti-theft system according to claim 1, wherein the enable signal is generated by said code transmitter.
Claim 4
Dependent Claim
18 words
The anti-theft system according to claim 2, wherein said code transmitter is disposed on a mechanical door/ignition key.
Claim 5
Dependent Claim
34 words
The anti-theft system according to claim 3, including a further code transmitter disposed on a key for generating the enable signal when said further code transmitter is located in the interior of the vehicle.
Claim 6
Dependent Claim
29 words
The anti-theft system according to claim 1, including a further code transmitter generating the enable signal when said further code transmitter is located in the interior of the vehicle.
Claim 7
Dependent Claim
42 words
The anti-theft system according to claim 5, wherein said further code transmitter is a transponder disposed on a grip portion of a door/ignition key, said transponder generating the enable signal as a consequence of a request signal received by said control unit.
Claim 8
Dependent Claim
22 words
The anti-theft system according to claim 1, wherein the enable signal is transmitted as a radio signal, optical signal, or acoustical signal.
Claim 9
Dependent Claim
23 words
The anti-theft system according to claim 1, wherein the engine starting signal is transmitted as a radio signal, optical signal, or acoustical signal.
Claim 10
Dependent Claim
27 words
The anti-theft system according to claim 1, including an ignition switch turned on by turning a door/ignition key in an ignition lock for generating the enable signal.
Claim 11
Dependent Claim
38 words
The anti-theft system according to claim 1, including a data bus connecting said control unit to at least one of an engine control unit, a transmission control unit, an electronic steering wheel lock and a brake control unit.
Claim 12
Dependent Claim
43 words
The anti-theft system according to claim 1, wherein at least one of said control unit and said receiver unit is part of an engine control unit, and including a receiving antenna electrically connected to said engine control unit for receiving the enable signal.
References Cited (Backward Citations)
US4080537A
Cited
US5042439A
Cited
US5184584A
Cited
DE4333474A1
Cited
DE4329697A1
Cited
US5673017A
Cited
EP0659963A1
Cited
US5519376A
Cited
US5610574A
Cited
US5612578A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2001-10-05 | 2002-04-06 | 2002-10-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2005-10-05 | 2006-04-06 | 2006-10-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2009-10-05 | 2010-04-06 | 2010-10-06 | $7700.00 | Window Closed / Lapsed |