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. 19, 1995
Filed:
May. 10, 1993
Bernard Lamazou, Colombes, FR;
Franck Francisque, Saint Cyr L'Ecole, FR;
Matra Transport, , FR;
Abstract
The system comprises an interrogation assembly and a passive responder. One is carried by a mobile and the other by a track. The interrogation assembly includes continuously operating low frequency and medium frequency transmitters. The transmitters have respective antennas directed towards a predetermined zone with respect to the antennas, which is traversed by the responder during movement of the mobile. It further has a unit which is responsive to the characteristics of the responder when the responder is in the zone. The responder has a low frequency reception circuit which controls a medium frequency circuit. Both circuits have radiating circuits which are tuned and the low frequency signal generated in the low frequency circuit is used to short-circuit the medium frequency tuned circuit of the responder, at the rate of low frequency rate.