The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Aug. 15, 1995
Filed:
Apr. 10, 1992
George P Lambropoulos, Grosse Pointe Woods, MI (US);
TRW Inc., Lyndhurst, OH (US);
Abstract
A remote control keyless security system is presented herein for remotely controlling locking means mounted on a vehicle. A receiver is mounted on a vehicle. A remote transmitter includes a plurality of switches each representative of a control function to be performed and circuitry responsive to actuation of one of the switches for transmitting a digital signal having a security code, a sequence control code adapted to be sequentially changed in response to each actuation of a switch and a function code. The transmitter changes the sequence control code after each operation with the change being dependent upon information contained in the security code. The received security code is compared with a stored receiver security code. Circuitry responds to each occurrence of a match between the security codes for reading a stored sequence control code and changing it to define an updated sequence control code having a value dependent upon information contained in the stored security code. The updated sequence control code is compared with the received sequence control and an output indication is provided in dependence upon the comparison.