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. 26, 1991
Filed:
Apr. 04, 1990
Universite des Sciences et Techniques de Lille (U.S.T.L.) Flandres Artois, Villeneuve D'ASCQ, FR;
Abstract
A device for detecting the passage of at least one mobile body in at least ne location fixed by its travel along a path inside of a space in reference to which the said travel of the mobile body is evaluated. It is characterized in that the double reception circuit (29) which includes the responder, consists of two elements (20, 21) which, when the mobile body passes the monitoring location, generate two signals (31, 32) of an appreciably equivalent nature, and in that these elements (20, 21) are designed and connected with each other in such a way as to give opposite values to at least one of the characteristics of these signals (31, 32) which, when combined, form at least one resulting signal (R), at least one of the characteristics of which, at least at one fixed location (13) of the passage of the transmitter at right angles to the responder, changes in an abrupt fashion in accordance with a discernible amplitude variation from possible other variations of the characteristics considered in connection with the said resulting signal (R) and thus constitutes a particularly electric phenomenon hereinafter called top which, in the resulting signal (R), defines two distinct portions, each one of a certain length.