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:
Feb. 04, 1997
Filed:
Feb. 29, 1996
Applicant:
Inventors:
Irving S Reed, Santa Monica, CA (US);
Xiaowei Yin, Alhambra, CA (US);
Xuemin Chen, Los Angeles, CA (US);
Assignee:
Rockwell International Corporation, Pittsburgh, PA (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G08C / ;
U.S. Cl.
CPC ...
341176 ; 3408252 ; 3408253 ; 34082569 ; 34082556 ;
Abstract
A keyless entry system which employs an identification code for each transmitter, a key sequence number, and a rolling code generated by a polynomial equation ensure unauthorized access. The system provides for resynchronization in the event of battery replacement or power failure. The system accommodates activation of a transmitter and incrementation of the rolling code when it is out of range of the receiver. This system further accommodates replacement of lost or stolen keys with a higher priority key, which then prevents access by the lost or stolen transmitter.