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:
Oct. 10, 2006
Filed:
Jun. 21, 2004
Applicant:
Andreas Graefenstein, Karlsruhe, DE;
Inventor:
Andreas Graefenstein, Karlsruhe, DE;
Assignee:
Mann & Hummel GmbH, Ludwigsburg, DE;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
F01N 1/06 (2006.01); F01N 1/08 (2006.01); F01N 1/12 (2006.01); F01N 1/02 (2006.01);
U.S. Cl.
CPC ...
Abstract
A sound damping device () for a tubular duct (), particularly a gas transporting tract of an internal combustion engine () having a least one bypass channel () running parallel to a main duct () in a section of the duct (). The bypass channel () is longer than the main duct () between a branching off point () and a re-entry inlet (). The bypass duct according to the invention is configured as a spiral duct () which winds around the centrally disposed main duct () in order to decrease the installation space requirements for the noise suppressor ().