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:
Nov. 27, 2001
Filed:
Mar. 16, 1999
Jean-Marie Gaultier, Rousset, FR;
STMicroelectronics S.A., Gentilly, FR;
Abstract
A method for the identification of electronic cards within an investigation zone includes an identification number uniquely assigned to each electronic card. The method reconstructs the identification numbers according to a tree-like iterative algorithm. The algorithm includes the steps of sending an interrogation message intended for certain electronic cards present, and steps for sending a response message by the electronic cards. The response message includes a variable number whose value depends on the identification number of the electronic card. The interpretation of the existence and of the position at which a collision occurs between the bits of the variable numbers received enables the gradual reconstruction, possibly by blocks of bits, of the as yet unidentified bits of an identification number of an electronic card present.