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:
Apr. 25, 2006
Filed:
Apr. 04, 2001
Heinrich Haas, Meckenbeuren, DE;
Udo Knepper, Langenargen, DE;
Karlheinz Mueller, Friedrichshafen, DE;
Rolf Schuler, Salem, DE;
Heinrich Haas, Meckenbeuren, DE;
Udo Knepper, Langenargen, DE;
Karlheinz Mueller, Friedrichshafen, DE;
Rolf Schuler, Salem, DE;
Conti Temic Microelectronic GmbH, Nuremberg, DE;
Abstract
In a method for securing an object against unauthorized use, an interrogation unit () transmits an interrogation signal (s) and tests whether a response unit (), which is to be carried by an authorized user, responds to the interrogation signal with a response signal (r) that contains as information a code authorized for desecuring a security device (). If so, the security device is desecured. The securing method shall prevent unauthorized persons from establishing a radio link via relay stations between the interrogation unit () and the response unit () for providing the authorized code via this radio link without being noticed by the authorized user. The securing method prevents the desecuring of the security device () if the signal transit time of a signal transmitted as the interrogation signal (s) and received as the response signal (r) by the interrogation unit () during a monitoring time interval (t–t) is greater than a prescribed value. The method is carried out in a keyless security system for securing motor vehicles against unauthorized use.