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:
Dec. 10, 1985
Filed:
Sep. 27, 1982
Jean-Jacques Bezard, La Garenne, FR;
Charles H Jourdain, Frepillon, FR;
Bruno Lalanne, Courbevoie, FR;
JAEGER, , FR;
Abstract
Apparatus for monitoring the level of liquid in a tank or reservoir comprises a probe formed by a resistive metal element having a high temperature coefficient, and a supply means for the probe. The apparatus further comprises a voltage-frequency converter which is connected in parallel with the probe, two counters which are connected in parallel to the output of the converter, and a subtracting means connected to the outputs of the counters. A time base controls operation of the supply means during a complete cycle to effect a counting operation of the first counter for a given period of time at the beginning of a cycle, a counting operation of the second counter for the same period of time but at the end of the cycle, and operation of the subtracting means at the end of the cycle.