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. 03, 1981
Filed:
Aug. 10, 1979
Jean-Luc Leveque, Montfermeil, FR;
Laurent Rasseneur, Thorigny-sur-Marne, FR;
Jean P de Rigal, Claye Souilly, FR;
Gilbert Gras, Aulnay Sous Bois, FR;
L'Oreal, Paris, FR;
Abstract
Young's modulus and/or the internal damping factor of an elastic material is obtained by subjecting an area of the material to a sustained vibration. The presence of the material being tested changes the resonance of a mechanical resonator and determination of the changed resonance peak enables the required elastic characteristics to be obtained. The sample may be subjected to varying tension during testing and can conveniently be vibrated by signals obtained from a variable frequency generator although, preferably, an electronic circuit for vibrating the resonator has a feed-back loop to operate as an electro-mechanical auto-oscillator.