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:
Jul. 08, 2003
Filed:
Sep. 26, 2001
Karim Benghezal, Chalons-en-Champagne, FR;
Karim Ouenniche, Conde sur Marne, FR;
Marwal Systems, Chalons-en-Champagne, FR;
Abstract
The invention concerns a device for measuring liquid level, comprising a detection set (Si) including two piezoelectric cells ( ) associated with control means for transmitting ultrasonic waves respectively opposite a reference reflector ( ), located at a known distance (D) from the associated cell, and from the top surface ( ) of the liquid, and processing means for determining the level of liquid by operating on the respective propagation times of the ultrasounds emitted by each of the two cells ( ). The invention is characterised in that it comprises means for defining, after the device has been charged, an initialising phase ( bis) during which the control means control the piezoelectric cells ( ) such that the ratio between the excitation rate of the reference cell ( ) and that of the level-measuring cell ( ) is higher than the ratio between those same rates during the subsequent stabilised measuring phase ( ).