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:
Jun. 13, 2006
Filed:
Dec. 20, 2002
Applicant:
Nikolas Bergerhoff, Regensburg, DE;
Inventor:
Nikolas Bergerhoff, Regensburg, DE;
Assignee:
Siemens Aktiengesellschaft, Munich, DE;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G05B 19/00 (2006.01);
U.S. Cl.
CPC ...
Abstract
A bidirectional dialogue is carried out between a portable code emitter () and a base station () for access to a motor vehicle. Both signals are correlated with each other and the dialogue repeated at an altered carrier frequency. The distance of the code emitter () from the base station () is determined from the difference in two phase difference measurements between the sent and received signal in one station (or). Access to, or use of the motor vehicle () is only permitted when the code emitter () is within a certain distance from the motor vehicle ().