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. 24, 2007
Filed:
Feb. 05, 2003
Klaus Finkenzeller, Munich, DE;
Christoph Schiller, Munich, DE;
Klaus Finkenzeller, Munich, DE;
Christoph Schiller, Munich, DE;
Giesecke & Devrient GmbH, Munich, DE;
Abstract
Proposed is a device actuated by a transponder for the generation of a switch signal. The device is based on an oscillating circuit () with a capacitance (C), an identification coil (L) and an oscillator amplifier (). Connected to the oscillating circuit () is a frequency observer () which evaluates the frequency (f) tuned in the oscillating circuit () and which when finding a change emits a switch signal (S). A change of the frequency in the oscillating circuit () is effected by the approach of a transponder (). The device permits a nearly loadless transponder identification.