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:
Oct. 13, 1998
Filed:
Jan. 17, 1992
Michel Fallah, Aubagne, FR;
Gemplus Card International, Gemenos, FR;
Abstract
Disclosed is a system of communication between a fixed post and moving bodies that may arrive simultaneously in the radius of action of this post. This system uses an exchange protocol that begins with an initializing signal (INIT) common to the different moving bodies that arrive and continues with the transmission of an identification signal by each moving body, this transmission being done at the end of a duration (T+Nt) related to the value (N) of a part of an intrinsic specific code associated with the moving body, this duration being measured from the initialization signal. Preferably, the moving body transmits the beginning of its specific code, for example the first character of this code, followed by a random word having stipulated characteristics such that the terminal can detect whether several moving bodies have transmitted the same first character simultaneously. The post then asks them to transmit a second character in order to distinguish them from one another. Personalized exchanges could then begin when all the moving bodies have been identified.