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:
Apr. 25, 1995
Filed:
Feb. 02, 1994
Applicant:
Inventors:
Reinhard Stief, Weinheim, DE;
Gerhard Muller-Broll, Rimbach, DE;
Thomas Jost, Weinheim, DE;
Manfred Mattutat, Ladenburg, DE;
Klaus-Dieter Schmitt, Gorxheimertal, DE;
Assignee:
Firma Carl Freudenberg, Weinheim, DE;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
E04B / ;
U.S. Cl.
CPC ...
181286 ; 181293 ;
Abstract
A housing lining is disclosed with a self-supporting and airborne sound-absorbing layer of fibers. The fibers are compressed and glued together at least in the region of the edge surrounding the layer on the outside, to form an essentially pore-free supporting frame. The supporting frame may be provided with a cup-shaped bulge which comprises sound absorption surfaces which have a sound impedance of 20 to 200 Rayl.