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:
Sep. 07, 2010
Filed:
Jul. 07, 2006
Arnaud Duval, Gifhorn, DE;
Valérie Marcel, Mouzon, FR;
Jean-françois Rondeau, Carignan, FR;
Patrice Charbonnier, Mouzon, FR;
Arnaud Duval, Gifhorn, DE;
Valérie Marcel, Mouzon, FR;
Jean-François Rondeau, Carignan, FR;
Patrice Charbonnier, Mouzon, FR;
Faurecia Automotive Industrie, Nanterre, FR;
Abstract
A soundproofing assembly includes stacked layers in the form of a first set of layers () having good resistance to the passage of air, and a second set of layers () with mass-spring function including a layer () having a heavy viscoelastic mass and a spring type layer (); the first set of layers includes a layer () of a foam with open cells of high porosity, high tortuosity and good resistance to the passage of air, the layer () having, owing to its high tortuosity, excellent sonic absorption properties at medium and high frequencies. The invention is useful for soundproofing motor car passenger compartments.