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:
Dec. 24, 1996
Filed:
Apr. 10, 1995
Applicant:
Inventors:
Reinhard Stief, Weinheim, DE;
Gerhard Muller-Broll, Rimbach, DE;
Assignee:
Firma Carl Freudenberg, Weinheim, DE;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
E04B / ;
U.S. Cl.
CPC ...
181295 ; 181286 ; 181293 ;
Abstract
A noise damper comprising a molded part of polymer material having at least two chambers which are designed as resonators with resonant frequencies that differ from one another. The molded part consists of a closed-cell material. The resonators are formed of essentially cup-shaped protrusions that open toward the sound source, the molded part on the side facing the sound source being covered by an orifice plate comprising at least two openings leading into each chamber. The molded part and the orifice plate are detachably joined together.