Patent US5883443A successfully refreshed from Google Patents.
US5883443A
Expired / Lapsed
US
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Countermeasure method and system for securing a remote keyless entry system
Assignee: Lear Automotive Dearborn Inc
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Filing: 1997-06-27
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Granted: 1999-03-16
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Expires: 2017-06-27
Abstract
Abstract The present invention teaches a method for preventing the use of an unauthorized reproduction of a remote unlock signal. In this scenario, the unauthorized reproduction occurs by jamming the receiver from receiving the remote unlock signal while intercepting the remote unlock signal. Generally, the remote unlock signal is transmitted by a transmitter to the receiver within a vehicle having a lock, wherein the receiver initiates an unlock command in response to receiving the transmitted remote unlock signal, and the vehicle lock being mechanically actuated by a key or electronically initiated by the unlock command in a previous locking session. The method for preventing the use of an unauthorized reproduction of a remote unlock signal comprises the steps of sensing whether the vehicle lock is being mechanically actuated by the key in the previous locking session, generating a flag if the vehicle lock has been mechanically actuated by the key, and disabling the receiver from initiating the unlock command in response to receiving the remote unlock signal transmitted by the transmitter if the flag is generated.
Inventors
- 👤 Mark M. Wilson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 22:27
CPC Classifications
H; H04; H04K; H04K3/00; H04K3/80; H04K3/92; B; B60; B60R; B60R25/00; B60R25/01; B60R25/04; B60R25/20; B60R25/2072; B60R25/24; G; G07; G07C; G07C9/00; G07C9/00174; G07C9/00182; H04K3/20; H04K3/22; H04K3/224; H04K3/82; H04K3/822; G07C2009/00753; G07C2009/00769; G07C2009/00793; G07C2209/00; G07C2209/04; H04K2203/00; H04K2203/10; H04K2203/22
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
137 words
A method for preventing access to a vehicle using an unauthorized reproduction of a remote unlock signal that is transmitted by a transmitter to a receiver supported by the vehicle having a lock, the receiver initiating an unlock command in response to receiving the transmitted remote unlock signal, the vehicle lock being mechanically actuated by a key or electronically initiated by the unlock command in a previous unlocking session, the method comprising the steps of: sensing whether the vehicle lock has been mechanically actuated by the key in the previous unlocking session; generating a flag if the vehicle lock has been mechanically actuated by the key in the previous unlocking session; and disabling the receiver from initiating the unlock command in response to receiving the remote unlock signal transmitted by the transmitter if said flag is generated.
Claim 2
Independent Claim
137 words
A method for preventing access to a vehicle using an unauthorized reproduction of a remote unlock signal that is transmitted by a transmitter to a receiver supported by the vehicle having a lock, the receiver initiating an unlock command in response to receiving the transmitted remote unlock signal, the vehicle lock being mechanically actuated by a key or electronically initiated by the unlock command in a previous unlocking session, the method comprising the steps of: sensing whether the vehicle lock has been mechanically actuated by the key in the previous unlocking session; generating a flag if the vehicle lock has been mechanically actuated by the key in the previous unlocking session; and disabling the receiver from initiating the unlock command in response to receiving the remote unlock signal transmitted by the transmitter if said flag is generated.
Claim 3
Dependent Claim
24 words
The method of claim 1, further comprising the steps of: generating a warning signal if the receiver is disabled and said flag is generated.
Claim 4
Dependent Claim
30 words
The method of claim 2, wherein said warning signal comprises at least one of blowing a horn, triggering an alarm, flashing of lights, and initiating a camera for recording images.
Claim 5
Dependent Claim
17 words
The system of claim 2, further comprising the step of: transmitting said warning signal to the transmitter.
Claim 6
Dependent Claim
37 words
The method of claim 1, wherein the receiver is disabled from initiating the unlock command in a subsequent unlocking session, in response to a further remote unlock signal transmitted by the transmitter of said flag is generated.
Claim 7
Independent Claim
167 words
A method for preventing access to a vehicle using an unauthorized reproduction of a first encrypted rolling code signal from a set of encrypted rolling code signals comprising a function unlock code and being transmitted by a remote transmitter to a receiver supported on the vehicle having a lock mechanically actuated by a key or electronically initiated by an unlock command in a previous unlocking session, the receiver initiating the unlock command in response to receiving the function unlock code, the method comprising the steps of: sensing whether the vehicle lock has been mechanically actuated by the key in the previous unlocking session; setting a first flag if the vehicle lock has been opened mechanically in the previous unlocking session in response to said sensing step; disabling the receiver from initiating the unlock command in response to the first encrypted rolling code signal being retransmitted if said first flag is generated; and generating a warning signal if the receiver is disabled and said first flag is generated.
Claim 8
Independent Claim
167 words
A method for preventing access to a vehicle using an unauthorized reproduction of a first encrypted rolling code signal from a set of encrypted rolling code signals comprising a function unlock code and being transmitted by a remote transmitter to a receiver supported on the vehicle having a lock mechanically actuated by a key or electronically initiated by an unlock command in a previous unlocking session, the receiver initiating the unlock command in response to receiving the function unlock code, the method comprising the steps of: sensing whether the vehicle lock has been mechanically actuated by the key in the previous unlocking session; setting a first flag if the vehicle lock has been opened mechanically in the previous unlocking session in response to said sensing step; disabling the receiver from initiating the unlock command in response to the first encrypted rolling code signal being retransmitted if said first flag is generated; and generating a warning signal if the receiver is disabled and said first flag is generated.
Claim 9
Dependent Claim
30 words
The method of claim 6, wherein said warning signal comprises at least one of blowing a horn, triggering an alarm, flashing of lights, and initiating a camera for recording images.
Claim 10
Dependent Claim
17 words
The system of claim 6, further comprising the step of: transmitting said warning signal to the transmitter.
Claim 11
Dependent Claim
42 words
The method of claim 6, further comprising the step of: disabling the receiver from initiating the unlock command, in a subsequent unlocking session, in response to a subsequent encrypted rolling code signal transmitted by the transmitter if said first flag is generated.
Claim 12
Independent Claim
142 words
A system for preventing access to a vehicle using an unauthorized reproduction of a remote unlock signal that is transmitted by a transmitter to a receiver supported by the vehicle having a lock, the receiver initiating an unlock command in response to receiving the transmitted remote unlock signal, the vehicle lock being mechanically actuated by a key or electronically initiated by the unlock command in a previous unlocking session, the system comprising: a sensor for determining whether the vehicle lock has been mechanically actuated by the key in the previous unlocking session; and a processor for generating a flag if the vehicle lock has been mechanically actuated by the key in the previous unlocking session, and for disabling the receiver from initiating the unlock command in response to receiving the remote unlock signal transmitted by the transmitter if said flag is generated.
Claim 13
Independent Claim
142 words
A system for preventing access to a vehicle using an unauthorized reproduction of a remote unlock signal that is transmitted by a transmitter to a receiver supported by the vehicle having a lock, the receiver initiating an unlock command in response to receiving the transmitted remote unlock signal, the vehicle lock being mechanically actuated by a key or electronically initiated by the unlock command in a previous unlocking session, the system comprising: a sensor for determining whether the vehicle lock has been mechanically actuated by the key in the previous unlocking session; and a processor for generating a flag if the vehicle lock has been mechanically actuated by the key in the previous unlocking session, and for disabling the receiver from initiating the unlock command in response to receiving the remote unlock signal transmitted by the transmitter if said flag is generated.
Claim 14
Dependent Claim
22 words
The system of claim 10, where said processor generates a warning signal if the receiver is disabled and said flag is generated.
Claim 15
Dependent Claim
30 words
The system of claim 11, wherein said warning signal comprises at least one of blowing a horn, triggering an alarm, flashing of lights, and initiating a camera for recording images.
Claim 16
Dependent Claim
17 words
The system of claim 11, wherein said warning signal is transmitted by the receiver to the transmitter.
Claim 17
Dependent Claim
38 words
The system of claim 10, wherein said processor disables the receiver from initiating the unlock command, in a subsequent unlocking session, in response to a further remote unlock signal transmitted by the transmitter if said flag is generated.
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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) | 2002-03-15 | 2002-09-14 | 2003-03-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2006-03-15 | 2006-09-14 | 2007-03-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2010-03-15 | 2010-09-14 | 2011-03-16 | $7700.00 | Window Closed / Lapsed |