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:
Aug. 01, 1989
Filed:
Jul. 10, 1987
Oliver Chrithian, Creil, FR;
Charles Brun, Montataire, FR;
Usinor Aciers, Puteaux, FR;
Abstract
The apparatus includes excitation windings (5, 6, 7) for imparting to an elongate specimen (1) of ferromagnetic material longitudinal oscillations. A device (30) is provided for cutting off a power amplifier (21) of one (5) of the excitation windings, along with a device (28, 29, 30, 32, 33) for detecting and counting the damped oscillations, after the cutting off of the excitation, whose amplitude is greater than or equal to the initial amplitude of the oscillations multiplied by a coefficient so as to permit the determination of the coefficient of internal friction. The excitation winding are constituted by three coaxial cylindrical windings (5, 6, 7) disposed around the specimen (1).