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:
Aug. 03, 2004
Filed:
Feb. 18, 2003
Applicant:
Inventors:
Norman Brooks, Oshawa, CA;
Doru N. Serban, Richmond Hill, CA;
Assignee:
General Motors of Canada Limited, Oshawa, CA;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
F01N 7/18 ;
U.S. Cl.
CPC ...
F01N 7/18 ;
Abstract
A muffler includes a housing having an inlet, an outlet, and at least one variable resonance chamber defined by a slidable member. The slidable member may be actuated by the pressure of exhaust gas flowing through the housing. Actuation of the slidable member changes the length of the resonance chamber, which alters the resonance and/or the flow path of the exhaust to provide varying tuning for acoustic damping.