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:
Apr. 24, 1990
Filed:
Dec. 30, 1988
Jean-Luc Martinoli, Villeneuve La Garenne, FR;
Alain Rousseau, Paris, FR;
Pascal Vilain, Hadancourt le Haut Clocher, FR;
Serbio, , FR;
Abstract
The invention relates to a method and device for determining the time of modification of the physical state of a fluid medium of the kind in which a ferromagnetic ball is placed in the bottom of a cup containing the fluid to be studied and driven with a periodic movement under the effect of an external magnetic field and in which the modifications of the movements of this ball, due to the modification, are detected. The method is characterized by the fact that the ball always follows at each period the same imposed path and in that the amplitude variations and/or the frequency of its movement are detected.