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:
Sep. 04, 2012
Filed:
Jul. 23, 2009
Alexandre Charles, Auriol, FR;
Jérôme Conraux, Trets, FR;
Alexandre Malherbe, Trets, FR;
Alexandre Tramoni, Saint Aygulf, FR;
Alexandre Charles, Auriol, FR;
Jérôme Conraux, Trets, FR;
Alexandre Malherbe, Trets, FR;
Alexandre Tramoni, Saint Aygulf, FR;
STMicroelectronics (Rousset) SAS, Rousset, FR;
Abstract
A method of detection of the presence of a contactless communication element by a terminal emitting an electromagnetic field, in which an oscillating circuit of the terminal is excited at a frequency which is made variable between two values surrounding a nominal tuning frequency of the oscillating circuit; a signal representative of the load of the oscillating circuit being interpreted to detect that a reference voltage has not been exceeded, which indicates the presence of an element in the field. A presence-detection circuit and a corresponding terminal.