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. 26, 1985
Filed:
Sep. 09, 1983
Dieter Jablonka, Herdecke, DE;
Klaus Urban, Herdecke, DE;
Heinz-Peter Raidt, Dortmund, DE;
Eberhard Schepers, Herdecke, DE;
Fraunhofer-Gesellschaft zur Forderung der angewandten Forschung e.V., Munich, DE;
Ewald Dorken AG, Herdecke, DE;
Abstract
A sound-absorbing element of films has adjacent, cup-shaped recesses in the orm of a grid. The bottom surfaces of the films which are to be exposed to the sound field may be excited into dissipative vibrations when sound is incident thereon. The upper edges of the cup-shaped recesses are jointly covered by another flat material web. The bottom surfaces of the cup-shaped recesses are subdivided into bases by one or more crimp-shaped recesses, the depth of which is appreciably smaller than the depth of the cup-shaped recesses. The sound-absorbing element may be used in building, underground and tunnel construction and in vehicle construction.