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:
Oct. 07, 1997
Filed:
Feb. 20, 1996
Anton Bachhuber, Langquaid, DE;
Siemens Aktiengesellschaft, Munich, DE;
Abstract
An immobilizer for a motor vehicle and a method for operating the immobilizer include a test unit, control devices connected through a data line to the test unit, and at least one ignition key having a transponder. When the ignition key is actuated, the test unit transmits a request signal through the data line to all of the control devices, which respond thereto by transmitting back identification codes which are compared with desired codes. The test unit prevents starting of the motor if fewer than a prescribed number of control devices reply with their identification code. The test unit enables all of the control devices if at least the prescribed number of control devices reply with their identification code word, in the event of interrogation.