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:
Feb. 13, 2001
Filed:
Dec. 17, 1996
Manfred Roller, Niederstotzingen, DE;
Klaus Pfaffelhuber, Günzburg, DE;
Stefan Lahner, Krumbach, DE;
Gerhard Köck, Waltenhausen, DE;
M. Faist GmbH & Co. KG, Krumbach, DE;
Abstract
A layered absorber for absorbing acoustical sound waves comprising a plurality of layers with at least one layer being spaced apart from another layer by spacers, and at least one layer having a thickness between 0.01 and 5 mm, such spacers being spaced apart from each other between the layers such that gas-filled chambers are formed, wherein the chambers form resonance chambers for acoustic sound waves by tuning the mass-spring pairs of the resonance chambers such that one maximum per mass-spring pair appears in the absorption curve, and wherein a multiple of parallel resonance chambers of a variety of different dimensions of the parallel resonance chambers are formed by varying at least one of the lateral dimensions of the parallel resonance chambers, the densities of the materials of the walls of the parallel resonance chambers, the thicknesses of the walls of the parallel resonance chambers, the rigidity of the materials of the walls of the parallel resonance chambers, the thicknesses of the walls of the parallel resonance chambers and the heights of the parallel resonance chambers in order to reach different sound absorptions in the respective absorption spectra.