Keyless device for controlling access to automobiles and keyless method for checking access authorization
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Mar 25, 2003
Grant Date -
N/A
app pub date -
Jan 14, 2000
filing date -
Jul 5, 1997
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A keyless vehicle access control system includes a transceiver in a vehicle and a mobile transponder. The transceiver includes transmitters for transmitting respective code signals and a key interrogation signal and is operable for receiving response and crypto-code signals. The transponder is operable for receiving the code and the key interrogation signals and for transmitting response and crypto-code. Upon the transponder receiving a code signal from a respective transmitter the transponder transmits a response signal indicative of the respective transmitter to the transceiver unit. Upon the transponder receiving a interrogation signal from the transceiver unit the transponder transmits a crypto-code signal to the transceiver unit. Upon the transceiver unit receiving a crypto-code signal from the transponder the transceiver checks the crypto-code signal to determine vehicle access authorization of the transponder. The transceiver actuates a vehicle access function associated with the respective transmitter upon determining that the transponder has authorization.
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